WO2018188117A1 - Laser excitation apparatus and excitation method therefor - Google Patents

Abstract

Provided is a laser excitation apparatus, comprising a laser emission apparatus (1), and an optical conversion medium (2) arranged facing a laser-emergent end of the laser emission apparatus (1) and maintaining a set distance from the laser emission apparatus (1), wherein the optical conversion medium (2) can absorb the laser emitted from the laser emission apparatus (1) and can acquire an emergent light source with a desired colour temperature. The laser excitation apparatus overcomes the defect of the poor light source quality of an emergent light source caused by existing lasers being excited by means of an optical conversion medium with a back side for irradiation and a front side for light emission, while the apparatus excites an optical conversion medium by using a front side for irradiation and a back side for light emission, thus having the advantages of completely exciting the laser, having a good emergent light source quality, and the quality being stable.

Description

Laser excitation device and excitation method thereof Technical field

The invention relates to a laser excitation device and an excitation method thereof, in particular to a laser reflection excitation laser white light source device and an excitation method thereof, which are applied in the field of illumination.

Background technique

The conventional laser excitation is generally performed by illuminating the back of the light-emitting surface of the light-converting medium, and the obtained outgoing light source is emitted from the light-emitting surface (ie, the front surface). However, since the intensity of the laser light is much stronger than that of the general beam, and the spot is concentrated, the general light conversion medium is not easily excited. Therefore, color unevenness often occurs at the edge of the outgoing light source, which affects the quality of the light source of the outgoing light source. Therefore, it is a matter of urgency to provide a laser excitation device with a complete excitation of a light-converting medium, a uniform emission source, and a good light-emitting effect.

Summary of the invention

In order to overcome the shortcomings of the prior art laser excitation through the light conversion medium, the light conversion medium is incompletely excited, the output light source is not uniform, and the light output effect is poor, which is caused by the light exiting from the light exit surface, and the present invention provides a laser. The excitation device and the excitation method thereof use the light exiting surface to illuminate the light exiting surface to excite the light conversion medium, and have the advantages that the light conversion medium is completely excited, the outgoing light source is uniform, and the light output effect is good.

The technical solution of the present invention is as follows:

A laser excitation device comprising a laser emitting device and a light conversion medium disposed facing the laser emitting end of the laser emitting device and maintaining a set spacing (generally between 1 mm and 30 cm) with the laser emitting device The light conversion medium can absorb the laser light emitted by the laser emitting device to obtain an outgoing light source of a desired color temperature. a light exiting surface of the light conversion medium faces a laser emitting end of the laser emitting device, and the laser emitting device is offset from a central axis position of the light converting medium; the laser exciting device further includes a light converting medium disposed a light reflecting layer facing away from the laser emitting end of the laser emitting device; a side of the light reflecting layer facing the light converting medium is a reflecting surface through which the reflecting layer penetrates the light converting medium The laser is reflected back to the light conversion medium for re-excitation conversion, and the area of the reflective surface is slightly larger than the projected area of the light conversion medium facing the laser emitting end of the laser emitting device on the reflecting surface.

The laser excitation device of the present application is different from the excitation method of the prior art laser excitation device for emitting light from the front surface of the light conversion medium, and the laser excitation device of the present application is opposite to the laser emission end of the laser emission device. a reflective layer is disposed at the rear, and when the laser is incident from the front surface of the light conversion medium, the excitation light conversion medium emits light and penetrates the light conversion medium. A single excitation does not fully excite the light conversion medium. After the laser light passing through the light conversion medium reaches the reflecting surface of the light reflecting layer, it is reflected back to the light converting medium to be excited again, which not only can completely excite the light converting medium, but also can improve the excitation unevenness of the light converting medium. At the same time, the light emitted by the light-converting medium is also reflected when it reaches the position of the reflecting surface, and is emitted from the front surface of the light-converting medium. The final exit source (the output source is a mixture of the laser and the light from which the light conversion medium is excited) emits light from the front side of the light conversion medium, overcoming the conventional laser to illuminate the front side of the light conversion medium, and because the laser beam is too strong and The spot is relatively concentrated, and the resulting light conversion medium is incompletely excited. The edge of the outgoing light source often has the disadvantages of uneven color and poor light output. The laser excitation device emits light completely, the emission source is uniform, and the light output effect is good. Wherein, the reflective layer can be disposed directly behind the side of the laser light-emitting end of the laser light-emitting device, or the light-reflecting layer can be opposite to the laser light-emitting device The exit end is kept at a certain distance.

The light reflecting layer is a temperature resistant plate having a whiteness of >85% or the reflective layer comprises a temperature resistant material plate and a reflective coating coated on at least one side of the temperature resistant material plate facing the light conversion medium, the reflective coating It is a silver-plated layer or a temperature-resistant coating with a whiteness of >85%.

The preferred reflective layer has a good reflection effect. The silver plating layer is low in cost, easy to prepare, and has a good reflection effect.

The light reflecting layer is in the form of a flat plate, a curved plate or other shapes.

The laser emitting device emits laser light containing at least a laser having a wavelength range of 200-470 nm, and the optical conversion medium has an emission spectrum of one or more spectral combinations of 460-800 nm, the optical conversion The medium absorbs the laser light to obtain a laser white light exiting light source of 1500-8000 K color temperature.

The laser cooperates with a specific conversion spectrum of the light conversion medium to obtain a relatively pure laser white light exiting light source of 1500-8000K color temperature.

The light conversion medium is any one of a fluorescent glass, a transparent fluorescent ceramic, a fluorescent single crystal, or a phosphor block.

The phosphor block is formed by mixing and solidifying a phosphor with a transparent glue. Among them, the light conversion medium is preferably a fluorescent glass, a transparent fluorescent ceramic, or a fluorescent single crystal. Since the energy of the 200-470 nm laser is high, if the light conversion medium uses a fluorescent sheet made of a conventional phosphor plus silica gel, it will be colored by the high temperature generated by the laser in the case of receiving the laser irradiation for a long period of time. Changes and failures, shortening the life of the light source, resulting in unstable light quality. When the light conversion medium adopts any one of fluorescent glass, transparent fluorescent ceramics, and fluorescent single crystal, the visible light transmittance is high and the property is stable, and the light emitted by the light source can be efficiently and stably converted into one kind. The standard application of white light, long life of the light source and stable light quality, greatly saving costs.

The light conversion medium is any one of a fluorescent glass, a transparent fluorescent ceramic, a fluorescent single crystal, or a phosphor block.

Fluorescent glass, transparent fluorescent ceramics or fluorescent single crystals prepared using aluminate, nitride, oxide, oxynitride, silicate, phosphate, sulfate or tungstate systems have higher excitation conversion efficiencies.

The visible light transmittance of the light conversion medium is ≥80%.

The high-visible transmittance optical conversion medium absorbs the excitation laser and emits light with higher efficiency, achieving high light conversion efficiency.

The light-emitting surface of the light conversion medium is coated with an anti-reflection film of 400-800 nm capable of improving the light-emitting effect of the light source.

The anti-reflection film is arranged such that more of the excitation laser light source of the 400-800 nm wavelength range is emitted from the light exit surface of the light conversion medium, and the brightness and quality of the exit light source are improved.

The laser emitting device is any one of a solid laser, a fiber laser or a semiconductor laser or any combination thereof. When a plurality of laser emitting devices are combined, the laser emitted from the laser emitting device is combined or concentrated. Convert the medium to light.

The above-described excitation method of the laser excitation device includes an illumination source that is irradiated with the laser light from the laser emission device and then absorbed by the light conversion medium to obtain a desired color temperature. The excitation method further includes the laser light penetrating the light conversion medium reaching a reflection layer disposed at a position of the light-reflecting layer disposed directly behind the laser light-emitting end of the laser light-emitting device The surface is reflected back to the light converting medium for re-excitation conversion.

The excitation method of the laser excitation device of the present application is different from the method of laser excitation using the back surface illumination of the front side, but the front side illumination is used to illuminate the front side, and the reflection layer is added to make the laser light penetrate the light conversion medium after the excitation medium is converted. The second conversion of the light conversion medium can be performed, which greatly improves the conversion efficiency and makes the laser excitation conversion complete.

The laser emitting device emits at least a laser having a wavelength range of 200-470 nm to the light conversion medium, and the light conversion medium having an emission spectrum of one or more spectral combinations between 460 and 800 nm absorbs the light Laser, laser light source with a color temperature of 1500-8000K.

By the above-described combination of the preferred incident laser light and the light conversion medium, a laser white light emitting source of the color temperature of good purity can be obtained.

Compared with the prior art, the present invention has the following advantages:

1) The laser excitation device and the excitation method thereof of the present application adopt a method of providing a light-reflecting layer on the side of the laser-emitting end of the laser-emitting device, and adopting a front-side illumination of the front surface, instead of the conventional back-illuminated front light. The excitation conversion mode enables the laser to perform secondary excitation on the light conversion medium, and the reflective layer also reflects the light emitted by the light conversion medium, so that the light conversion medium is more completely excited, the outgoing light source is more uniform, and the light output effect is better. ;

2) a preferred light-reflecting layer and a light-converting medium are combined to obtain high-purity laser light of the color temperature;

3) The arrangement of the antireflection film on the light exit surface of the light conversion medium improves the brightness and quality of the exit light source.

DRAWINGS

1 is a schematic view showing the overall structure of the embodiment 1-5 of the laser excitation device according to the present invention;

2 is a cross-sectional view of the light-reflecting layer when the reflective layer of the embodiment 1-6 of the laser excitation device of the present invention is a flat temperature-resistant plate having a whiteness of >85%;

3 is a cross-sectional view of the reflective layer of the embodiment 1-6 of the laser excitation device of the present invention comprising a flat temperature resistant material sheet and a reflective coating applied to the side of the temperature resistant material sheet facing the light conversion medium;

4 is a cross-sectional view of the reflective layer of the embodiment 1-6 of the laser excitation device according to the present invention, including a flat temperature resistant material plate and a reflective coating on the entire temperature resistant material plate;

Figure 5 is a schematic view showing the overall structure of the embodiment 1-5 of the laser excitation device according to the present invention when the reflective layer is in the shape of a curved plate;

Figure 6 is a cross-sectional view of the light-reflecting layer of the embodiment 1-6 of the laser excitation device according to the present invention when the reflective layer is a curved plate-shaped temperature-resistant plate having a whiteness of >85%;

7 is a laser excitation device according to the present invention, the reflective layer of the embodiment 1-6 includes a curved plate-shaped temperature-resistant material plate and a reflective layer coated on the surface of the temperature-resistant material plate facing the light conversion medium. Cutaway view

8 is a cross-sectional view of the reflective layer of the embodiment 1-6 of the laser excitation device according to the present invention, including a curved plate-shaped temperature-resistant material plate and a reflective coating on the entire temperature-resistant material plate;

FIG. 9 is a schematic view showing the overall structure of the reflective layer of the laser excitation device according to the sixth embodiment of the present invention;

FIG. 10 is a schematic view showing the overall structure of the embodiment 6 of the laser excitation device according to the present invention when the reflective layer is in the shape of a curved plate.

Label description:

The laser emitting device 1, the light converting medium 2, the light reflecting layer 3, the laser emitting end 11, the light emitting surface 21, the antireflection film 22, the reflecting surface 31, the temperature resistant material plate 32, and the reflective coating layer 33.

detailed description

The technical solution of the present invention will be described in detail below with reference to the accompanying drawings 1-10.

Example 1

As shown in FIGS. 1-8, a laser excitation device according to the present invention includes a laser emitting device 1 and a laser emitting end 11 facing the laser emitting device 1 and is set with the laser emitting device 1 A pitched light-converting medium 2 capable of absorbing laser light emitted from the laser emitting device 1 to obtain an outgoing light source of a desired color temperature. The light exit surface 21 of the light conversion medium 2 faces the laser exit end 11 of the laser emitting device 1, and the laser emitting device 1 is offset from the central axis position of the light conversion medium 2; the laser excitation device further includes a setting a light reflecting layer 3 facing away from the laser emitting end 11 of the laser emitting device 1; a side of the reflecting layer 3 facing the light converting medium 2 is a reflecting surface 31, and the reflecting layer 3 The laser light that has not been completely excited and converted through the light conversion medium 2 is reflected back to the light conversion medium 2 by the reflective surface 31 for re-excitation conversion, and the area of the reflective surface 31 is slightly larger than the light conversion medium 2 The laser emitting end 11 facing away from the laser emitting device 1 is on the reflecting surface 31 The projected area. The light-reflecting layer 3 is a temperature-resistant plate having a whiteness of >85% or the light-reflecting layer 3 includes a temperature-resistant material plate 32 and a reflective coating 33 coated on at least one side of the temperature-resistant material plate 32 toward the light conversion medium 2 The reflective coating 33 is a silver plated layer or a temperature resistant coating having a whiteness of >85%. The reflective coating layer 33 may be applied only to one side of the temperature resistant material sheet 32 facing the light conversion medium 2, or may be coated with the entire temperature resistant material sheet 32. The light reflecting layer may be in the form of a flat plate or a curved plate.

The method for exciting the laser excitation device includes the laser light emitted from the laser emitting device 1 after being irradiated to the light conversion medium 2, and then absorbed by the light conversion medium 2 to obtain an exit light source of a desired color temperature. The excitation method further includes penetrating the laser light that has not been completely excitedly converted through the light conversion medium 2 to a reflective layer disposed directly behind the laser light-emitting end 11 of the laser light-emitting device 1 At the three positions, the reflective surface 31 of the light reflecting layer 3 is reflected back to the optical conversion medium 2 for re-excitation conversion.

Example 2

As shown in FIGS. 1-8, a laser excitation device according to the present invention includes a laser emitting device 1 and a laser emitting end 11 facing the laser emitting device 1 and is set with the laser emitting device 1 A pitched light-converting medium 2 capable of absorbing laser light emitted from the laser emitting device 1 to obtain an outgoing light source of a desired color temperature. The light exit surface 21 of the light conversion medium 2 faces the laser exit end 11 of the laser emitting device 1, and the laser emitting device 1 is offset from the central axis position of the light conversion medium 2; the laser excitation device further includes a setting a light reflecting layer 3 facing away from the laser emitting end 11 of the laser emitting device 1; a side of the reflecting layer 3 facing the light converting medium 2 is a reflecting surface 31, and the reflecting layer 3 The laser light that has not been completely excited and converted through the light conversion medium 2 is reflected back to the light conversion medium 2 by the reflective surface 31 for re-excitation conversion, and the area of the reflective surface 31 is slightly larger than the light conversion medium 2 The projected area of the laser emitting end 11 of the laser emitting device 1 on the reflecting surface 31. The light-reflecting layer 3 is a temperature-resistant plate having a whiteness of >85% or the light-reflecting layer 3 includes a temperature-resistant material plate 32 and a reflective coating 33 coated on at least one side of the temperature-resistant material plate 32 toward the light conversion medium 2 The reflective coating 33 is a silver plated layer or a temperature resistant coating having a whiteness of >85%. The reflective coating layer 33 may be applied only to one side of the temperature resistant material sheet 32 facing the light conversion medium 2, or may be coated with the entire temperature resistant material sheet 32. The light reflecting layer may be in the form of a flat plate or a curved plate. The laser emitted from the laser emitting device 1 contains at least a laser having a wavelength range of 200-470 nm, and the emission spectrum of the optical conversion medium 2 is one or more spectral combinations of 460-800 nm. The light conversion medium 2 absorbs the laser light to obtain a laser white light exiting light source of a color temperature of 1500-8000K.

The laser emitting device 1 emits to the light conversion medium 2 a laser light containing at least a wavelength range of 200-470 nm, the emission spectrum being one or more spectral combinations of 460-800 nm 2 Absorbing the laser to obtain a laser white light exiting light source of 1500-8000K color temperature. The laser light that has not been completely excitedly converted through the light conversion medium 2 reaches a reflection disposed rearward of a side of the light-emitting medium 2 facing away from the laser light-emitting end 11 of the laser light-emitting device 1 At the position of layer 3, the reflective surface 31 of the light-reflecting layer 3 is reflected back to the light-converting medium 2 for re-excitation conversion.

Example 3

As shown in FIGS. 1-8, a laser excitation device according to the present invention includes a laser emitting device 1 and a laser emitting end 11 facing the laser emitting device 1 and is set with the laser emitting device 1 A pitched light-converting medium 2 capable of absorbing laser light emitted from the laser emitting device 1 to obtain an outgoing light source of a desired color temperature. The light exit surface 21 of the light conversion medium 2 faces the laser exit end 11 of the laser emitting device 1, and the laser emitting device 1 is offset from the central axis position of the light conversion medium 2; the laser excitation device further includes a setting a light reflecting layer 3 facing away from the laser emitting end 11 of the laser emitting device 1; a side of the reflecting layer 3 facing the light converting medium 2 is a reflecting surface 31, and the reflecting layer 3 The laser light that has not been completely excited and converted through the light conversion medium 2 is reflected back to the light conversion medium 2 by the reflective surface 31 for re-excitation conversion, and the area of the reflective surface 31 is slightly larger than the light conversion medium 2 The projected area of the laser emitting end 11 of the laser emitting device 1 on the reflecting surface 31. The light-reflecting layer 3 is a temperature-resistant plate having a whiteness of >85% or the light-reflecting layer 3 includes a temperature-resistant material plate 32 and a reflective coating 33 coated on at least one side of the temperature-resistant material plate 32 toward the light conversion medium 2 The reflective coating 33 is a silver plated layer or a temperature resistant coating having a whiteness of >85%. The reflective coating layer 33 may be applied only to one side of the temperature resistant material sheet 32 facing the light conversion medium 2, or may be coated with the entire temperature resistant material sheet 32. The light reflecting layer may be in the form of a flat plate or a curved plate. The laser emitted from the laser emitting device 1 contains at least a laser having a wavelength range of 200-470 nm, and the emission spectrum of the optical conversion medium 2 is one or more spectral combinations of 460-800 nm. The light conversion medium 2 absorbs the laser light to obtain a laser white light exiting light source of a color temperature of 1500-8000K. The light conversion medium 2 is a phosphor block.

The laser emitting device 1 emits to the light conversion medium 2 a laser light containing at least a wavelength range of 200-470 nm, the emission spectrum being one or more spectral combinations of 460-800 nm 2 Absorbing the laser to obtain a laser white light exiting light source of 1500-8000K color temperature. The laser light that has not been completely excitedly converted through the light conversion medium 2 reaches a position of the light-reflecting layer 3 disposed directly behind the laser light-emitting end 11 of the laser light-emitting device 1 The reflecting surface 31 of the light reflecting layer 3 is reflected back to the light converting medium 2 for re-excitation conversion.

Example 4

As shown in FIGS. 1-8, a laser excitation device according to the present invention includes a laser emitting device 1 and a laser emitting end 11 facing the laser emitting device 1 and is set with the laser emitting device 1 A pitched light-converting medium 2 capable of absorbing laser light emitted from the laser emitting device 1 to obtain an outgoing light source of a desired color temperature. The light exit surface 21 of the light conversion medium 2 faces the laser exit end 11 of the laser emitting device 1, and the laser emitting device 1 is offset from the central axis position of the light conversion medium 2; the laser excitation device further includes a setting In the light conversion The medium 2 is opposite to the light reflecting layer 3 directly behind the laser emitting end 11 of the laser emitting device 1; one side of the reflecting layer 3 facing the light converting medium 2 is a reflecting surface 31, and the reflecting layer 3 passes through the reflecting surface 31. Reflecting the laser light that has not been completely excitedly converted through the light conversion medium 2 back to the light conversion medium 2 for re-excitation conversion, the area of the reflective surface 31 being slightly larger than the light conversion medium 2 facing away from the laser The projected area of the laser emitting end 11 of the launching device 1 on the reflecting surface 31. The light-reflecting layer 3 is a temperature-resistant plate having a whiteness of >85% or the light-reflecting layer 3 includes a temperature-resistant material plate 32 and a reflective coating 33 coated on at least one side of the temperature-resistant material plate 32 toward the light conversion medium 2 The reflective coating 33 is a silver plated layer or a temperature resistant coating having a whiteness of >85%. The reflective coating layer 33 may be applied only to one side of the temperature resistant material sheet 32 facing the light conversion medium 2, or may be coated with the entire temperature resistant material sheet 32. The light reflecting layer may be in the form of a flat plate or a curved plate. The laser emitted from the laser emitting device 1 contains at least a laser having a wavelength range of 200-470 nm, and the emission spectrum of the optical conversion medium 2 is one or more spectral combinations of 460-800 nm. The light conversion medium 2 absorbs the laser light to obtain a laser white light exiting light source of a color temperature of 1500-8000K. The light conversion medium 2 is any one of a fluorescent glass, a transparent fluorescent ceramic or a fluorescent single crystal, and the fluorescent glass, the transparent fluorescent ceramic or the fluorescent single crystal is an aluminate, a nitride, an oxide, an oxynitride, or a silicon. Any of an acid salt, phosphate, sulfate or tungstate system.

The laser emitting device 1 emits to the light conversion medium 2 a laser light containing at least a wavelength range of 200-470 nm, the emission spectrum being one or more spectral combinations of 460-800 nm 2 Absorbing the laser to obtain a laser white light exiting light source of 1500-8000K color temperature. The laser light that has not been completely excitedly converted through the light conversion medium 2 reaches a position of the light-reflecting layer 3 disposed directly behind the laser light-emitting end 11 of the laser light-emitting device 1 The reflecting surface 31 of the light reflecting layer 3 is reflected back to the light converting medium 2 for re-excitation conversion.

Example 5

As shown in FIGS. 1-8, a laser excitation device according to the present invention includes a laser emitting device 1 and a laser emitting end 11 facing the laser emitting device 1 and is set with the laser emitting device 1 A pitched light-converting medium 2 capable of absorbing laser light emitted from the laser emitting device 1 to obtain an outgoing light source of a desired color temperature. The light exit surface 21 of the light conversion medium 2 faces the laser exit end 11 of the laser emitting device 1, and the laser emitting device 1 is offset from the central axis position of the light conversion medium 2; the laser excitation device further includes a setting a light reflecting layer 3 facing away from the laser emitting end 11 of the laser emitting device 1; a side of the reflecting layer 3 facing the light converting medium 2 is a reflecting surface 31, and the reflecting layer 3 The laser light that has not been completely excited and converted through the light conversion medium 2 is reflected back to the light conversion medium 2 by the reflective surface 31 for re-excitation conversion, and the area of the reflective surface 31 is slightly larger than the light conversion medium 2 The projected area of the laser emitting end 11 of the laser emitting device 1 on the reflecting surface 31. The light-reflecting layer 3 is a temperature-resistant plate having a whiteness of >85% or the light-reflecting layer 3 includes a temperature-resistant material plate 32 and a reflective coating 33 coated on at least one side of the temperature-resistant material plate 32 toward the light conversion medium 2 The reflective coating 33 is Silver-plated layer or a temperature-resistant coating with a whiteness >85%. The reflective coating layer 33 may be applied only to one side of the temperature resistant material sheet 32 facing the light conversion medium 2, or may be coated with the entire temperature resistant material sheet 32. The light reflecting layer may be in the form of a flat plate or a curved plate. The laser emitted from the laser emitting device 1 contains at least a laser having a wavelength range of 200-470 nm, and the emission spectrum of the optical conversion medium 2 is one or more spectral combinations of 460-800 nm. The light conversion medium 2 absorbs the laser light to obtain a laser white light exiting light source of a color temperature of 1500-8000K. The light conversion medium 2 is any one of a fluorescent glass, a transparent fluorescent ceramic or a fluorescent single crystal, and the fluorescent glass, the transparent fluorescent ceramic or the fluorescent single crystal is an aluminate, a nitride, an oxide, an oxynitride, or a silicon. Any of an acid salt, phosphate, sulfate or tungstate system. The visible light transmittance of the light conversion medium 2 is ≥80%.

The laser emitting device 1 emits to the light conversion medium 2 a laser light containing at least a wavelength range of 200-470 nm, the emission spectrum being one or more spectral combinations of 460-800 nm 2 Absorbing the laser to obtain a laser white light exiting light source of 1500-8000K color temperature. The laser light that has not been completely excitedly converted through the light conversion medium 2 reaches a position of the light-reflecting layer 3 disposed directly behind the laser light-emitting end 11 of the laser light-emitting device 1 The reflecting surface 31 of the light reflecting layer 3 is reflected back to the light converting medium 2 for re-excitation conversion.

Example 6

As shown in FIGS. 9, 10, 2-4, and 6-8, a laser excitation device according to the present invention includes a laser emitting device 1 and a laser emitting end 11 facing the laser emitting device 1 and is disposed The laser emitting device 1 holds a light-converting medium 2 having a set pitch, which can absorb the laser light emitted from the laser emitting device 1 to obtain an outgoing light source of a desired color temperature. The light exit surface 21 of the light conversion medium 2 faces the laser exit end 11 of the laser emitting device 1, and the laser emitting device 1 is offset from the central axis position of the light conversion medium 2; the laser excitation device further includes a setting a light reflecting layer 3 facing away from the laser emitting end 11 of the laser emitting device 1; a side of the reflecting layer 3 facing the light converting medium 2 is a reflecting surface 31, and the reflecting layer 3 The laser light that has not been completely excited and converted through the light conversion medium 2 is reflected back to the light conversion medium 2 by the reflective surface 31 for re-excitation conversion, and the area of the reflective surface 31 is slightly larger than the light conversion medium 2 The projected area of the laser emitting end 11 of the laser emitting device 1 on the reflecting surface 31. The light-reflecting layer 3 is a temperature-resistant plate having a whiteness of >85% or the light-reflecting layer 3 includes a temperature-resistant material plate 32 and a reflective coating 33 coated on at least one side of the temperature-resistant material plate 32 toward the light conversion medium 2 The reflective coating 33 is a silver plated layer or a temperature resistant coating having a whiteness of >85%. The reflective coating layer 33 may be applied only to one side of the temperature resistant material sheet 32 facing the light conversion medium 2, or may be coated with the entire temperature resistant material sheet 32. The light reflecting layer may be in the form of a flat plate or a curved plate. The laser emitted from the laser emitting device 1 contains at least a laser having a wavelength range of 200-470 nm, and the emission spectrum of the optical conversion medium 2 is one or more spectral combinations of 460-800 nm. The light conversion medium 2 absorbs the laser light to obtain a laser white light exiting light source of a color temperature of 1500-8000K. Light exit surface of the light conversion medium 2 21 is coated with an anti-reflection film 22 of 400-800 nm which can enhance the light-emitting effect of the outgoing light source.

The laser emitting device 1 emits to the light conversion medium 2 a laser light containing at least a wavelength range of 200-470 nm, the emission spectrum being one or more spectral combinations of 460-800 nm 2 Absorbing the laser to obtain a laser white light exiting light source of 1500-8000K color temperature. The laser light that has not been completely excitedly converted through the light conversion medium 2 reaches a position of the light-reflecting layer 3 disposed directly behind the laser light-emitting end 11 of the laser light-emitting device 1 The reflecting surface 31 of the light reflecting layer 3 is reflected back to the light converting medium 2 for re-excitation conversion.

The laser excitation device and the excitation method thereof according to the present invention are not limited to the above embodiments, and any improvement or substitution according to the principles of the present invention should be within the scope of the present invention.

Claims (9)

A laser excitation device comprising a laser emitting device (1) and a light conversion disposed facing the laser emitting end (11) of the laser emitting device (1) and maintaining a set spacing with the laser emitting device (1) a medium (2) capable of absorbing laser light emitted by the laser emitting device (1) to obtain an exiting light source of a desired color temperature, characterized in that the light of the light converting medium (2) An exit surface (21) faces a laser exit end (11) of the laser emitting device (1), and the laser emitting device (1) is offset from a central axis position of the light conversion medium (2); the laser excitation device further a reflective layer (3) disposed on a side of the light-converting medium (2) facing away from a laser emitting end (11) of the laser emitting device (1); the reflective layer (3) facing the light-converting medium ( 2) is a reflecting surface (31) through which the reflecting layer (3) reflects the laser light penetrating the light converting medium (2) back to the light converting medium (2). The excitation is again excited, the area of the reflecting surface (31) being slightly larger than the laser emitting end of the light converting medium (2) facing away from the laser emitting device (1) (11) The projected area on one side of the reflecting surface (31). The laser excitation device according to claim 1, wherein the light reflecting layer (3) is a temperature resistant plate having a whiteness of > 85% or the reflective layer (3) comprises a temperature resistant material plate (32) and at least a reflective coating (33) coated on one side of the temperature-resistant material plate (32) facing the light conversion medium (2), the reflective coating (33) being a silver-plated layer or a temperature-resistant coating having a whiteness of >85% Floor. The laser excitation device according to claim 2, characterized in that the laser emitted from the laser emitting device (1) contains at least a laser having a wavelength in the range of 200-470 nm, and the emission of the optical conversion medium (2) The spectrum is one or more spectral combinations between 460-800 nm, the light converting medium (2) absorbing the laser to obtain a laser white light exiting source of 1500-8000 K color temperature. The laser excitation device according to claim 3, wherein the light conversion medium (2) is any one of a fluorescent glass, a transparent fluorescent ceramic, a fluorescent single crystal, or a phosphor block. The laser excitation device according to claim 4, wherein the light conversion medium (2) is any one of fluorescent glass, transparent fluorescent ceramic or fluorescent single crystal, the fluorescent glass, transparent fluorescent ceramic or fluorescent single The crystal is any one of an aluminate, nitride, oxide, oxynitride, silicate, phosphate, sulfate or tungstate system. The laser excitation device according to claim 5, characterized in that the visible light transmittance of the light conversion medium (2) is ≥ 80%. The laser excitation device according to claim 3, characterized in that: the light exit surface (21) of the light conversion medium (2) is coated with an anti-reflection film of 400-800 nm capable of enhancing the light-emitting effect of the outgoing light source (22) . The method for exciting a laser excitation device according to any one of claims 1 to 7, comprising: after the laser light emitted from the laser emitting device (1) is irradiated onto the light conversion medium (2), the optical conversion medium (2) An exiting light source that absorbs to obtain a desired color temperature, wherein the exciting method further comprises the laser reaching through the light converting medium (2) to be disposed at When the light conversion medium (2) is opposite to the position of the light reflecting layer (3) directly behind the laser emitting end (11) of the laser emitting device (1), the reflecting surface (31) of the reflecting layer (3) Reflected back to the light conversion medium (2) for re-excitation conversion. The excitation method of a laser excitation device according to claim 8, characterized in that the laser emitting device (1) emits at least a laser having a wavelength range of 200-470 nm to the light conversion medium (2). The light conversion medium (2) having an emission spectrum of one or more spectral combinations between 460 and 800 nm absorbs the laser light to obtain a laser white light exiting light source of 1500-8000 K color temperature.

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