CN220306703U - Mid-infrared light generating system and laser - Google Patents
Mid-infrared light generating system and laser Download PDFInfo
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- CN220306703U CN220306703U CN202322053010.9U CN202322053010U CN220306703U CN 220306703 U CN220306703 U CN 220306703U CN 202322053010 U CN202322053010 U CN 202322053010U CN 220306703 U CN220306703 U CN 220306703U
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Abstract
The embodiment of the utility model discloses a mid-infrared light generating system and a laser, wherein the mid-infrared light generating system comprises a conversion light path and a regulation light path, the conversion light path comprises a pumping source capable of emitting pumping light and a conversion structure arranged on a propagation path of the pumping light, the conversion structure can convert the pumping light into mid-infrared light, and the pumping light can spontaneously generate signal light in the conversion structure to be emitted. The regulating optical path comprises a semi-transparent component capable of reflecting the signal light and transmitting the pump light and a transmission component, the semi-transparent component and the transmission component are matched to transmit the signal light to an irradiation path of the pump light so as to irradiate the pump light into the conversion structure after beam combination with the pump light, and the transmission component can enable the time domain of the signal light and the time domain of the pump light to be at least partially overlapped. Through setting up regulation and control light path, can simplify the light path structure and can promote the conversion efficiency of mid infrared light.
Description
Technical Field
The utility model relates to the technical field of lasers, in particular to a mid-infrared light generating system and a laser.
Background
In recent years, 3-5 mu m short pulse mid-infrared laser plays an important role in various fields such as spectrum detection, material analysis, space communication and the like, and is already applied to civil technology and national defense technology. The synchronous pulse pumping difference frequency generation technology induces pumping light by means of time-frequency domain synchronous signal light, and a three-wave mixing process occurs in a nonlinear crystal, so that mid-infrared laser output with high conversion efficiency is obtained.
In the related art, the injected synchronous signal light source is mainly generated by additionally constructing a laser or utilizing the spectrum broadening of a highly nonlinear optical fiber. Additional construction of the laser that generates the signal light source adds cost and also adds to the overall complexity of the system. The signal light source obtained through the spectrum widening of the high nonlinear optical fiber can influence the generation of infrared rays in the subsequent difference frequency due to the spectrum jitter of the signal light caused by the unstable nonlinear modulation. Therefore, developing a short-pulse mid-infrared laser with a simple structure and high conversion efficiency is a research problem to be broken through currently.
Disclosure of Invention
In view of the above, it is necessary to provide a mid-infrared light generating system and a laser having a simple structure and high conversion efficiency.
The embodiment of the utility model provides a mid-infrared light generating system, which comprises:
a conversion optical path including a pump source capable of emitting pump light and a conversion structure provided on a propagation path of the pump light, the conversion structure being capable of converting the pump light into mid-infrared light, and the pump light being capable of spontaneously generating signal light within the conversion structure to be emitted;
and the regulating and controlling optical path comprises a semi-transparent component capable of reflecting the signal light and transmitting the pump light, and a transmission component, wherein the semi-transparent component and the transmission component are matched to transmit the signal light to an irradiation path of the pump light so as to be irradiated into the conversion structure after being combined with the pump light, and the transmission component can change the time domain of the signal light in a mode of changing the transmission distance so as to enable the time domain of the signal light and the time domain of the pump light to be at least partially overlapped.
In some embodiments, the semi-transparent component includes a first dichroic mirror and a second dichroic mirror disposed at intervals, the first dichroic mirror and the second dichroic mirror are both located on a path of the pump light, and the pump light can pass through the first dichroic mirror and the second dichroic mirror, the conversion structure is located between the first dichroic mirror and the second dichroic mirror, the second dichroic mirror can reflect the signal light to the transmission component, the signal light is transmitted to the first dichroic mirror via the transmission component, and the first dichroic mirror can reflect the signal light onto an irradiation path of the pump light.
In some embodiments, the second dichroic mirror is coated with a light transmission film of 2 μm or more and a light reflection film of 1.7 μm or less, and the first dichroic mirror is coated with a light transmission film of 1 μm or more and a light reflection film of 1.5 μm or less.
In some embodiments, the transmission assembly includes a first mirror and a second mirror disposed at a distance, the signal light reflected by the second dichroic mirror being capable of being reflected to the first dichroic mirror via the first mirror and the second mirror in sequence.
In some embodiments, the reflectivity of each of the first and second mirrors is greater than or equal to 99%, and the spacing between the first and second mirrors is adjustable.
In some embodiments, the conversion structure includes a first lens, a second lens, and a nonlinear crystal disposed at intervals along the path of the pump light, the nonlinear crystal being located between the first lens and the second lens, the first lens employing a plano-convex lens, the second lens employing an achromatic lens.
In some embodiments, the semipermeable component includes two wavelength division multiplexers disposed at intervals, the transmission component is an optical fiber delay line, the conversion structure is located between the two wavelength division multiplexers, the conversion structure includes a nonlinear waveguide, the wavelength division multiplexer can transmit light of the pump source and can reflect the signal light, two ends of the optical fiber delay line are respectively connected to the two wavelength division multiplexers, and the signal light can be respectively reflected by the wavelength division multiplexer located on an emission path thereof, the optical fiber delay line and the other wavelength division multiplexer, and then, after being reflected by the wavelength division multiplexer, the signal light is combined with the pump beam.
In some embodiments, the regulated optical path further includes a filter positioned between the semi-transmissive component and the transmissive component to define a spectrum of the signal light.
In some embodiments, the conversion optical path is further provided with a long-pass filter with a wavelength of 2 μm, and the mid-infrared light converted by the conversion structure can be irradiated to the filter.
The embodiment of the utility model also provides a laser, which comprises the mid-infrared light generating system.
The embodiment of the utility model has the following beneficial effects:
according to the mid-infrared light generating system and the laser in the embodiments, the signal light generated under the spontaneous parameters of the pump light can be transmitted to the propagation path of the pump light by setting the regulating light path, so that the signal light and the pump light are emitted into the conversion structure after being combined, and the transmission distance of the transmission component is changeable, so that the time domain of the signal light and the time domain of the pump light are partially overlapped and even consistent by changing the transmission distance, and further, a signal source is provided for the process of converting the mid-infrared light by the pump light in the conversion structure, the threshold value of converting the mid-infrared light can be reduced, the pump light is more easily converted into the mid-infrared light, and the conversion efficiency of the mid-infrared light is improved. In addition, the conversion efficiency of the mid-infrared light can be improved only by regulating and controlling the light path, so that the light path of the whole system is simpler, the signal light is generated by the pump light, the frequency domain of the signal light is consistent with that of the pump light, and the signal light is not required to be regulated and controlled in the frequency domain, so that the whole system has better stability.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Wherein:
FIG. 1 shows a schematic diagram of a mid-IR light generation system according to the present utility model;
fig. 2 shows another schematic structural diagram of the mid-infrared light generating system provided according to the present utility model.
Description of main reference numerals:
1. converting the light path; 11. a pump source; 12. a switching structure; 121. a first lens; 122. a second lens; 123. a nonlinear crystal; 124. a nonlinear waveguide; 13. a filter; 2. regulating and controlling an optical path; 21. a semipermeable component; 211. a first dichroic mirror; 212. a second dichroic mirror; 213. a wavelength division multiplexer; 22. a transmission assembly; 221. a first mirror; 222. a second mirror; 223. an optical fiber delay line; 23. a filter.
Detailed Description
In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Preferred embodiments of the present utility model are shown in the drawings. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In recent years, 3-5 mu m short pulse mid-infrared laser plays an important role in various fields such as spectrum detection, material analysis, space communication and the like, and is already applied to civil technology and national defense technology. For the middle infrared laser which is developed and mature in the prior art, the quantum cascade laser can obtain middle and long wavelength infrared output, but has lower conversion efficiency and high manufacturing cost. CO 2 The (carbon dioxide) gas laser has high conversion efficiency and better monochromaticity, but has huge volume and is easily influenced by the atmosphere. In contrast, solid-state lasers based on the principle of optical parametric oscillation (Optical parametric oscillator, OPO) have high conversion efficiency and compact spatial structure, but are limited by parametric optical resonance conditions, and optical path adjustment is relatively complex. In recent years, an emerging synchronous pulse pump difference frequency generation technology has attracted a great deal of attention, and the synchronous pulse pump difference frequency generation technology induces by means of signal light synchronized in the time-frequency domain, and a three-wave mixing process occurs in the nonlinear crystal 123, thereby obtaining mid-infrared laser output with high conversion efficiency.
Currently, the injected synchronization signal light source is mainly generated by additionally constructing a laser or utilizing the spectrum broadening of a highly nonlinear optical fiber. Additional construction of the laser that generates the signal light source adds cost and also adds to the overall complexity of the system. The signal light source obtained through the spectrum widening of the high nonlinear optical fiber can influence the generation of infrared rays in the subsequent difference frequency due to the spectrum jitter of the signal light caused by the unstable nonlinear modulation.
The present utility model provides a mid-infrared light generating system, which can be applied to a laser for generating mid-infrared light, and in one embodiment, referring to fig. 1, the mid-infrared light generating system includes a conversion optical path 1 and a modulation optical path 2.
The conversion optical path 1 includes a pump source 11 capable of emitting pump light and a conversion structure 12 disposed on a propagation path of the pump light, where the conversion structure 12 generally includes a nonlinear crystal 123, and the conversion structure 12 can convert the pump light into mid-infrared light by using the nonlinear crystal. The pump source 11 preferably employs a 1035nm femtosecond laser with an output power up to 20W and a repetition rate of 1MHz.
When the pump source 11 reaches a certain power, the emitted pump light can be subjected to spontaneous parametric down-conversion in the conversion structure 12, and signal light can be generated and emitted from the conversion structure 12. The pump light is pulse light, and the generated signal light is pulse light, and the frequency domain of the signal light is consistent with that of the pump light.
The regulating optical path 2 includes a semi-transparent component 21 and a transmission component 22, the semi-transparent component 21 is located on the irradiation path of the pump light, the semi-transparent component 21 has the property of being capable of reflecting the signal light and transmitting the pump light, that is, the semi-transparent component 21 is used for reflecting the generated signal light, and the transmission component 22 is used for transmitting the reflected signal light.
It should be noted that, the signal light is generated in the conversion structure 12, and is emitted out of the conversion structure 12 together with the mid-infrared light, a part of the structures of the semi-transparent component 21 is located on the emission path of the signal light to change the propagation path of the signal light, the transmission structure is located on the path of the signal light after the propagation path is changed to transmit the signal light, and another part of the structures of the semi-transparent component 21 is located between the conversion structure 12 and the pump source 11, so that the propagation path of the signal light can be changed to be identical to the path of the pump light. The semi-transparent component 21 and the transmission component 22 cooperate to transmit the signal light to the irradiation path of the pump light, so as to combine with the pump light and irradiate the beam into the conversion structure 12.
In addition, the transmission distance of the transmission component 22 can also be changed, and the time domain of the signal light can be changed by changing the transmission distance, so that the time domain of the signal light and the time domain of the pump light can be at least partially overlapped, and even completely overlapped.
As shown in fig. 1, a broken line in the drawing shows a propagation path of the pump light, a solid line in the drawing with an arrow indicates a propagation path of the signal light, and an arrow indicates a propagation direction of the signal light.
Through setting up regulation and control light path 2, can be with the signal light transmission that produces under the spontaneous parameter of pump light to the propagation path of pump light for signal light and pump light are launched into conversion structure 12 after being close the beam, again because transmission component 22's transmission distance is changeable, can change the time domain of signal light through changing transmission distance, so that the time domain of signal light and the time domain partial coincidence of pump light even unanimous, and then provide the signal source for the process of pump light conversion mid-infrared light in conversion structure 12, can reduce the threshold value of conversion mid-infrared light, make the pump light convert mid-infrared light into more easily, promote mid-infrared light's conversion efficiency. In addition, the conversion efficiency of the mid-infrared light can be improved only by regulating the light path 2, so that the light path of the whole system is simpler, the signal light is generated by the pump light, the frequency domain of the signal light is consistent with that of the pump light, and the signal light is not required to be regulated and controlled in the frequency domain, so that the whole system has better stability.
In one embodiment, referring to fig. 1, the semi-transparent component 21 includes a first dichroic mirror 211 and a second dichroic mirror 212 disposed at intervals, the first dichroic mirror 211 and the second dichroic mirror 212 are located on the path of the pump light, and the first dichroic mirror 211 and the second dichroic mirror 212 are configured to allow the pump light to pass through and reflect the signal light. When the positions of the two dichroic mirrors are set, the conversion structure 12 is disposed between the first dichroic mirror 211 and the second dichroic mirror 212, and the second dichroic mirror 212 is disposed on the path along which the signal light is emitted from the conversion structure 12, so that the signal light generated in the conversion structure 12 can be irradiated onto the second dichroic mirror 212 after being emitted, the signal light can be reflected to the transmission block 22 by adjusting the angle of the second dichroic mirror 212, the signal light can be transmitted to the first dichroic mirror 211 via the transmission block 22, the reflection path of the signal light can be adjusted to coincide with the irradiation path of the pump light by adjusting the angle of the first dichroic mirror 211, and then the two light rays are coupled into the conversion structure 12.
In order to ensure the reflection effect of the signal light and the transmission effect of the pump light, a light-transmitting film of 2 μm or more and a light-reflecting film of 1.7 μm or less may be coated on the second dichroic mirror 212, and a light-transmitting film of 2 μm and a light-reflecting film of 1.7 μm are preferably used. A light-transmitting film of 1 μm or more and a light-reflecting film of 1.5 μm or less, preferably a light-transmitting film of 1 μm and a light-reflecting film of 1.5 μm, are plated on the first dichroic mirror 211.
In one embodiment, the transmission assembly 22 includes a first mirror 221 and a second mirror 222 that are disposed at intervals, where the first mirror 221 and the second mirror 222 are capable of reflecting the signal light, and the positions of the two mirrors and the two dichroic mirrors may be set according to practical situations, for example, in a preferred embodiment, the two mirrors and the two dichroic mirrors are arranged in a rectangular shape, where the first mirror 221 and the second dichroic mirror 212 are located at a side of the signal light emitting end, and the second mirror and the first dichroic mirror 211 are located between the pump source 11 and the conversion structure 12. By adjusting the angles of the two reflecting mirrors and the two dichroic mirrors, it is possible to achieve that the signal light is reflected by the second dichroic mirror 212 and then irradiated onto the first reflecting mirror 221, the first reflecting mirror 221 is further capable of reflecting the signal light onto the second reflecting mirror 222, the second reflecting mirror 222 is further capable of reflecting the signal light onto the first dichroic mirror 211, and the first dichroic mirror 211 changes the propagation path of the signal light so as to coincide with the path of the pump light.
The end surfaces of the first mirror 221 and the second mirror 222 for reflecting the signal light are both plated with silver, and the first mirror 221 and the second mirror 222 are both high-reflection mirrors, that is, the reflectivity of both mirrors is 99% or more.
The first mirror 221 and the second mirror 222 can be mounted on a high-precision motor control platform, and the positions of the two mirrors can be moved by motor control, so that the time domain of the signal light can be changed.
It should be noted that when the time domain of the signal light is adjusted, the conversion structure 12 may be moved out of the system first, that is, the signal light and the pump light that are to be combined are directly emitted, then the two light beams after the beam is collected by the detection device, whether the time domains of the signal light and the pump light are equal can be detected by the measurement device, the two reflectors are continuously adjusted in the detection process, when the time domains of the signal light and the pump light are equal, the adjustment of the reflectors is stopped, and the conversion structure 12 is placed in the system again.
In one embodiment, the conversion structure 12 includes a first lens 121, a second lens 122, and a nonlinear crystal 123 disposed at intervals along the path of the pump light, the nonlinear crystal 123 being located between the first lens 121 and the second lens 122.
The first lens 121, the second lens 122, and the nonlinear crystal 123 are not limited, the first lens 121 is preferably a K9 plano-convex lens, the second lens 122 is preferably an achromatic lens, the nonlinear crystal 123 is preferably a periodically poled lithium niobate (Periodically Poled Lithium Niobate, PPLN) crystal, the first lens 121 is used to focus pump light in the nonlinear crystal 123, the pump light can be subjected to three-wave mixing in the nonlinear crystal 123 to generate mid-infrared light, and the second lens 122 can be used to collimate the mid-infrared light emitted from the nonlinear crystal 123.
In one embodiment, referring to fig. 1, the adjusting optical path 2 further includes a filter 23, the filter 23 is a spatially adjustable filter 23, the spectrum of the light passing through the filter 23 can be defined by adjusting the parameters of the filter 23, the filter 23 is disposed on the optical path between the second dichroic mirror 212 and the first dichroic mirror 211, and the filter 23 is adjusted according to the actual situation, when the signal light irradiates the filter 23, the signal light with the corresponding spectrum can pass through the filter 23 according to the parameters of the filter 23, and the signal light with other spectrums can be prevented from passing through. The filter 23 is arranged, so that the spectrum of the signal light combined with the pump light can be limited, in different practical application scenes, the signal light with different spectrums has influence on the wavelength of the mid-infrared light formed by the induction of the conversion of the pump light, and therefore, the filter 23 is arranged, the signal light with different spectrums can be screened to be combined with the pump light, and the wavelength of the mid-infrared light obtained by conversion can be adjustable.
In addition, if the wavelength of the infrared light is adjustable in the pump light conversion, the inversion period and the temperature of the nonlinear crystal 123 may be tuned, and the parameters of specific adjustment need to be determined according to the actual situation, which will not be described herein.
In another embodiment, referring to fig. 2, the semipermeable component 21 includes two wavelength division multiplexers 213 disposed at intervals, the transmission component 22 is an optical fiber delay line 223, the nonlinear crystal 123 is replaced by a nonlinear waveguide 124, and the wavelength division multiplexer 213 has the same function as a dichroic mirror, and is capable of transmitting the light of the pump source 11 and reflecting the signal light. In this way, the two dichroic mirrors can be replaced by two wavelength division multiplexers 213, i.e. the conversion structure 12 is located between the two wavelength division multiplexers 213. The optical fiber delay line 223 replaces two reflectors, so that signal light can be transmitted in the optical fiber delay line 223, two ends of the optical fiber delay line 223 are respectively connected to the two wavelength division multiplexers 213, pump light is converted in the nonlinear crystal 123, signal light is generated, the signal light can be reflected into the optical fiber delay line 223 through the wavelength division multiplexers 213 positioned on the emission paths of the signal light, and transmitted to the wavelength division multiplexers 213 positioned between the pump source 11 and the conversion structure 12 through the optical fiber delay line 223, and the propagation paths of the signal light and the paths of the pump light can be overlapped through the adjustment of the wavelength division multiplexers 213 so as to combine the two light beams. By replacing the dichroic mirror with the wavelength division multiplexer 213, replacing the reflecting mirror with the optical fiber delay line 223, and replacing the nonlinear crystal 123 with the nonlinear waveguide 124, the optical fiber of the system can be realized, the anti-interference capability of the system is improved, and the system has the advantages of higher integration level and more miniaturization.
When the time domain of the signal light is adjusted, the adjustment of the time domain of the signal light can be achieved by adjusting the length of the optical fiber delay line 223.
In one embodiment, the conversion optical path 1 is further provided with a 2 μm long-pass filter 13, after the pump light is converted into mid-infrared light in the nonlinear crystal 123, the mid-infrared light can emit the nonlinear crystal 123, the emitted mid-infrared light can irradiate the filter 13, and the mid-infrared light in a required wavelength range can be screened by setting parameters of the filter 13.
On the other hand, the utility model also provides a laser, which comprises the mid-infrared light generating system.
The following describes an operation mode of the mid-infrared light generating system provided by the utility model, specifically: operating a femtosecond laser pumping source under low power, focusing a light beam into a nonlinear crystal through a first lens, collimating the light beam passing through the crystal through a second lens, emitting the collimated light beam through a 2 mu m long-pass filter, and measuring the power of the light beam passing through the filter through an integrating sphere type power meter, wherein the power meter shows that the number is 0;
and gradually increasing the output power of the pumping laser to the indication increase on the power meter until the threshold value of the signal light generated by the mid-infrared spontaneous parameters is reached. At the moment, the distance between the first lens and the second lens and the nonlinear crystal is regulated, the angle of the nonlinear crystal and the temperature of the nonlinear crystal are regulated, and the maximum value state of the middle infrared power output is found through power counting;
and a second dichroic mirror is added behind the second lens, the mid-infrared light can pass through the second dichroic mirror, and the signal light can be reflected by the second dichroic mirror so as to separate the signal light generated by the spontaneous parameters from the mid-infrared light. Then, the first reflecting mirror and the second reflecting mirror are utilized to carry out optical path adjustment on the signal light, the signal light is coupled to the first dichroic mirror, and the first dichroic mirror is utilized to combine the signal light with the pump light and the signal light;
after the signal light and the pump light are combined, a conversion structure is not arranged on a light irradiation path, the near infrared photoelectric detector and the high-precision signal acquisition card are used for detecting the combined light, the positions of the two reflectors are adjusted through the high-precision motor, whether the time domains of the pump light pulse sequence and the signal light pulse sequence are synchronous or not is determined according to the detection result, if so, the reflectors are stopped to be adjusted, and then the conversion structure is placed in a conversion light path;
the output power of the pump light and the focusing light spot distance are optimized, and the space mode matching effect of the pump light in the nonlinear crystal is improved, so that the conversion efficiency and the output power of the whole mid-infrared generating system are improved.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (10)
1. A mid-infrared light generating system, comprising:
a conversion optical path including a pump source capable of emitting pump light and a conversion structure provided on a propagation path of the pump light, the conversion structure being capable of converting the pump light into mid-infrared light, and the pump light being capable of spontaneously generating signal light within the conversion structure to be emitted;
and the regulating and controlling optical path comprises a semi-transparent component capable of reflecting the signal light and transmitting the pump light, and a transmission component, wherein the semi-transparent component and the transmission component are matched to transmit the signal light to an irradiation path of the pump light so as to be irradiated into the conversion structure after being combined with the pump light, and the transmission component can change the time domain of the signal light in a mode of changing the transmission distance so as to enable the time domain of the signal light and the time domain of the pump light to be at least partially overlapped.
2. The mid-infrared light generating system of claim 1, wherein the semi-transmissive assembly comprises first and second spaced apart dichroic mirrors, the first and second dichroic mirrors each being positioned in a path of the pump light, and the pump light being capable of passing through the first and second dichroic mirrors, the conversion structure being positioned between the first and second dichroic mirrors, the second dichroic mirror being capable of reflecting the signal light to the transmissive assembly for transmission to the first dichroic mirror via the transmissive assembly, the first dichroic mirror being capable of reflecting the signal light to an illumination path of the pump light.
3. The mid-infrared light generating system according to claim 2, wherein the second dichroic mirror is coated with a light-transmitting film of 2 μm or more and a light-reflecting film of 1.7 μm or less, and the first dichroic mirror is coated with a light-transmitting film of 1 μm or more and a light-reflecting film of 1.5 μm or less.
4. The mid-infrared light generating system as set forth in claim 2 or 3, wherein the transmission assembly comprises a first mirror and a second mirror disposed at a spacing, the signal light reflected by the second dichroic mirror being capable of being reflected to the first dichroic mirror via the first mirror and the second mirror in sequence.
5. The mid-infrared light generation system of claim 4, wherein the reflectivity of both the first mirror and the second mirror is greater than or equal to 99%, and wherein the spacing between the first mirror and the second mirror is adjustable.
6. The mid-infrared light generation system of claim 1 wherein the conversion structure comprises a first lens, a second lens, and a nonlinear crystal disposed at intervals along the path of the pump light, the nonlinear crystal being located between the first lens and the second lens, the first lens being a plano-convex lens and the second lens being an achromatic lens.
7. The mid-infrared light generating system as set forth in claim 1, wherein the semi-transparent component comprises two wavelength division multiplexers disposed at intervals, the transmission component is an optical fiber delay line, the conversion structure is disposed between the two wavelength division multiplexers, the conversion structure comprises a nonlinear waveguide, the wavelength division multiplexer can transmit light of the pump source and can reflect the signal light, two ends of the optical fiber delay line are respectively connected to the two wavelength division multiplexers, and the signal light can be respectively reflected by the wavelength division multiplexer, the optical fiber delay line and the other wavelength division multiplexer on the emission path thereof and then combined with the pump beam.
8. The mid-infrared light generation system of claim 1, wherein the modulating optical path further comprises a filter positioned between the semi-transmissive component and the transmissive component to define a spectrum of the signal light.
9. The mid-infrared light generating system according to claim 1, wherein the conversion light path is further provided with a long-pass filter of 2 μm, and the mid-infrared light converted by the conversion structure can be irradiated to the filter.
10. A laser comprising a mid-infrared light generating system as claimed in any one of claims 1 to 9.
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| CN117039601A (en) * | 2023-08-01 | 2023-11-10 | 珠海禾旭激光技术有限公司 | Mid-infrared light generating system, laser and mid-infrared light generating method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117039601A (en) * | 2023-08-01 | 2023-11-10 | 珠海禾旭激光技术有限公司 | Mid-infrared light generating system, laser and mid-infrared light generating method |
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