CN118818726B - Optical lens for laser surgery - Google Patents
Optical lens for laser surgeryInfo
- Publication number
- CN118818726B CN118818726B CN202411198969.4A CN202411198969A CN118818726B CN 118818726 B CN118818726 B CN 118818726B CN 202411198969 A CN202411198969 A CN 202411198969A CN 118818726 B CN118818726 B CN 118818726B
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- lens
- optical lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
本发明涉及为医疗用途专门设计的光学物镜技术领域，具体涉及一种用于激光手术的光学镜头，共十片透镜，沿着光轴从物侧至像侧依次包括：具有负光焦度的第一透镜，具有正光焦度的第二透镜，具有正光焦度的第三透镜，具有正光焦度的第四透镜，具有负光焦度的第五透镜，具有负光焦度的第六透镜，具有正光焦度的第七透镜，具有负光焦度的第八透镜，具有负光焦度的第九透镜，具有正光焦度的第十透镜，本发明解决了现有技术中能量密度小的问题。
This invention relates to the field of optical objective lens technology specifically designed for medical applications, specifically to an optical lens for laser surgery, comprising ten lenses arranged sequentially along the optical axis from the object side to the image side: a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, a sixth lens with negative optical power, a seventh lens with positive optical power, an eighth lens with negative optical power, a ninth lens with negative optical power, and a tenth lens with positive optical power. This invention solves the problem of low energy density in the prior art.
Description
Technical Field
The invention relates to the technical field of optical objective lenses specially designed for medical use, in particular to an optical lens for laser surgery.
Background
Femtosecond laser is a laser emitted in the form of pulses, the duration of which is only of the order of femtoseconds, the shortest pulse that humans can obtain under experimental conditions. Femtosecond lasers are used in ophthalmic surgery and are known as "another revolution of refractive surgery" following wavefront aberration techniques. The existing laser operation equipment for the human body uses near infrared laser as a main action light source, and because of the light wavelength range of infrared rays, the diffraction limit according to the optical principle often leads to the tendency of large energy action points of light spots and small energy density.
Disclosure of Invention
The application aims to provide an optical lens for laser surgery, which solves the problem of low energy density in the prior art.
The technical scheme of the application is as follows:
The invention provides an optical lens for laser surgery, which comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with negative focal power, a sixth lens with negative focal power, an object side with concave surface, a seventh lens with positive focal power, an object side with convex surface, an image side with a plane, an eighth lens with negative focal power, an object side with a plane, a ninth lens with negative focal power, an object side with a concave surface, a tenth lens with positive focal power, an object side with a convex surface, an image side with a concave surface, and a tenth lens with positive focal power, in order from the object side to the image side along an optical axis.
Preferably, the effective focal length of the optical lens is 62.5mm.
Preferably, the system f-number of the optical lens is 1.25.
Preferably, the entrance pupil diameter of the optical lens is 50mm.
Preferably, the optical total length of the optical lens is 160mm.
Preferably, the angle of view of the optical lens is-4.5 to +4.5 degrees.
Preferably, the optical lens is used for a femtosecond laser with a wavelength of 1030 nm.
Preferably, the scanning range of the optical lens is a circular range with a diameter of 10 mm.
The technical scheme of the application has at least the following advantages and beneficial effects:
The invention provides an optical lens for laser surgery, which uses a first lens to expand light beams in a certain range, uses a second lens and a third lens to respectively focus light beams in a micro-quantity, uses a fifth lens and a sixth lens to generate a large quantity of reverse spherical aberration through the negative power effect of the fifth lens and the sixth lens to counteract and neutralize positive spherical aberration generated by a front lens, and uses a seventh lens and an eighth lens to mutually generate focusing and neutralizing spherical aberration to further converge light beams, wherein the ninth lens and the tenth lens are used for comprehensively correcting astigmatism and field curvature of the light beams by a crescent lens. The optical lens can enable the laser energy in the center of the light spot to reach 80% of the whole laser incidence energy, can realize full application of the laser energy, improves the precision degree of cutting operation, and solves the problem of small energy density in the prior art.
Drawings
Fig. 1 is a schematic structural diagram of an optical lens according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of incident light rays with high field of view and inclination angles of an optical lens according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of zero-field parallel incident light of an optical lens according to an embodiment of the present invention;
FIG. 4 is a view field point column diagram of an optical lens according to an embodiment of the present invention;
FIG. 5 is a second view field point column diagram of an optical lens according to an embodiment of the present invention;
FIG. 6 is a third view field point column diagram of an optical lens according to an embodiment of the present invention;
FIG. 7 is a graph of a first optical path difference of an optical lens according to an embodiment of the present invention;
FIG. 8 is a graph of a second optical path difference of an optical lens according to an embodiment of the present invention;
FIG. 9 is a third optical path difference plot of an optical lens according to an embodiment of the present invention;
FIG. 10 is a graph of the fractional turn energy of an optical lens according to an embodiment of the present invention;
FIG. 11 is a graph of field curvature of an optical lens according to an embodiment of the present invention;
Fig. 12 is an MTF value data diagram of an optical lens according to an embodiment of the present invention;
fig. 13 is a simplified diagram of a usage mode of an optical lens according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1-11, the present invention provides an optical lens assembly for laser surgery, which comprises, in order from an object side to an image side along an optical axis, a first lens element E1 having negative optical power, an object side surface S1 being concave, an image side surface S2 being convex, a second lens element E2 having positive optical power, an object side surface S3 being convex, an image side surface S4 being convex, a third lens element E3 having positive optical power, an object side surface S5 being convex, an image side surface S6 being convex, a fourth lens element E4 having positive optical power, an object side surface S7 being convex, an image side surface S8 being concave, a fifth lens element E5 having negative optical power, an object side surface S9 being convex, an image side surface S10 being concave, a sixth lens element E6 having negative optical power, an object side surface S11 being concave, an image side surface S12 being convex, a seventh lens element E7 having positive optical power, an object side surface S13 being a plane, an image side surface S14 being a convex, an eighth lens element E8 having negative optical power, an object side surface S15 being a convex, an image side surface S16 being a concave, an image side surface S17 being a positive optical side surface S20 being a concave.
It is worth to say that the first lens E1 with negative focal power is used for expanding light beams in a certain range, the second lens E2, the third lens E3 and the fourth lens E4 are used for respectively carrying out micro focusing on the light beams, the fifth lens E5 and the sixth lens E6 generate a large amount of reverse spherical aberration through the self negative focal power effect and counteract and neutralize positive spherical aberration generated by the front lens, the seventh lens E7 and the eighth lens E8 mutually generate focusing and neutralizing spherical aberration to further converge light beams, and the ninth lens E9 and the tenth lens E10 carry out comprehensive correction of astigmatism and field curvature on the light beams through crescent lenses. The existing laser operation equipment for human body acts on the lens of infrared light, serious coma and curvature of field can be generated for light rays with a certain inclination angle, and light spots generated by the existing lens can generate obvious dispersion state due to oblique incident light. The focusing light spot generated by the optical lens provided by the embodiment is similar to the theoretical diffraction limit range, the diameter of the light spot is 3 microns, the light spot can be scanned in a circular range with the diameter of 1 cm, no obvious dispersion state is generated by oblique incident light, the laser energy in the center of the light spot can reach 80% of the whole laser incident energy, the full application of the laser energy can be realized, the precision degree of cutting operation is improved, the problem of small energy density in the prior art is solved, and the problem of obvious dispersion state generated by oblique incident light in the prior art is also solved.
The window mirror G1 in the present embodiment is specifically a biological interface protection window mirror G1 of the optical lens, and the thickness thereof is preferably 2mm. The aperture stop ST in this embodiment is specifically an aperture stop, and is used to control the size of the light incident range of the entire optical lens.
Referring to fig. 1-3, the conventional precise focusing lens usually uses an aspherical mirror, which has high processing precision, high processing difficulty and small mass production range. The optical lens provided by the embodiment is provided with ten lenses, and by increasing the number of lenses, the aberration correction is carried out by light rays propagating among the lenses made of the same material, so that more variables are provided. On the other hand, the focal power required by a strict light converging target is equally distributed to each lens, so that the lens group reduces the use and dependence on an aspheric lens, reduces the dependence on an abnormal lens, and reduces the difficulty of processing and production quantification of the lens.
The lens in the optical lens can effectively scan the centimeter range through a larger deflection angle, namely the optical lens provided by the embodiment can be used as a special laser photoetching focusing lens, so that the application environment of the optical lens mainly enables application laser to freely propagate in space and finally gather in a transparent object with a certain refractive index, such as a biological eyeball cornea. The scanning and cutting operation can be performed on a plane with a certain depth of the object without damaging the surface of the transparent object.
10 Lenses in the optical lens provided by the embodiment are all made of C79-80 colorless transparent borosilicate glass materials. The relevant parameters of each lens in the optical lens provided in this embodiment are shown in table 1:
TABLE 1
Example 2
On the basis of the embodiment 1, an optical lens for laser surgery is provided, specifically, the effective focal length of the optical lens is 62.5mm. The system f-number of the optical lens is 1.25. The entrance pupil diameter of the optical lens is 50mm. The optical total length of the optical lens is 160mm. The angle of view of the optical lens is-4.5 to +4.5 degrees. The optical lens is used for a femtosecond laser with the wavelength of 1030 nm. The scanning range of the optical lens is a circular range with the diameter of 10 mm.
The F-number of the optical system refers to the ratio of the effective focal length to the entrance pupil diameter. The optical total length of the optical lens described in the present embodiment is the distance from the stop up to the protective window mirror G1.
In the present embodiment, S22 to S23 are surface layer simulations of the cornea of a human eye by the present optical lens, which represent effective focal imaging at 0.1 mm below the cornea of the human eye. The refractive index of the simulated human cornea was about 1.376 and the Abbe number was 55.
In the existing lens group acting on flat field scanning, the lens group has a wide flat field scanning range, and the lens group cannot be applied to ophthalmic surgery directly because the lens group acting on flat field scanning has large converging light spots and overlong depth of field and has high precision action requirements in ophthalmic surgery. The optical lens provided by the embodiment is used for converging the laser in the femtosecond laser myopia correction operation and has the function, for converging the laser spots, the action point is required to be as small as possible, the depth of field range of the spots is reduced, so that the laser operation accuracy is improved, and the use of laser power is reduced.
Referring to fig. 4-6, a first view field point column diagram, a second view field point column diagram, and a third view field point column diagram are all obtained based on a zoom bar of 20 and a centroid as a reference, wherein the diffraction limit size of a light spot is 1.571 microns, the image plane height of the light beam is also the center when the light beam is not incident at an oblique angle, the effective energy light spot radius size is 0.326 microns, the geometric radius size of each image is 0.464 microns, and each image shows the image plane height of each image and the effective energy light spot radius size and geometric radius size of each point when the light beam is incident at different oblique angles. The maximum tilt angle is 4.5 degrees, the image plane height is 4.85 millimeters, and the effective energy spot radius size is 1.721 microns. Table 2 is a view field point column diagram No. one, a view field point column diagram No. two, a view field point column diagram No. three, RMS radius, GEO radius parameters:
| Visual field | First number | No. two | No. three |
| RMS radius | 0.326 | 0.677 | 1.721 |
| GEO radius | 0.464 | 2.539 | 5.551 |
TABLE 2
Referring to fig. 7-9, it can be seen from the data in the figures that the wavefront difference of each field of view does not exceed the range of 1 time wavelength, i.e. the wavefront difference exceeds one wavelength to generate interference effects that cancel each other out. In detail, the wavefront aberration is smaller than 1 time wavelength, so that the uniformity of laser beam energy can be improved, and the influence of laser internal interference can be reduced. The optical path difference graphs shown in fig. 7 to 9 are all completed under the parameter of maximum scaling of plus or minus 1 wave.
Referring to fig. 10, the data in the graph reflect that the laser effective energy is 80% in a radius range of 1.5 microns with the center of the mass of the light spot at the middle and low field angles. The energy in the light spot at the outermost circle of the scanning range with the center radius of the centroid as 1.5 microns also reaches 60%, and the energy utilization rate of the optical lens provided by the embodiment is good.
Referring to fig. 11, the maximum field of view of the parameters of the field curvature graph is 4.5000 degrees, the legend corresponds to the wavelength, and the data in the graph indicate that the optical lens provided by the embodiment has a sagittal field curvature of 0.0066 mm, a meridional field curvature of 0.0067 mm, and the final field curvature of 0.0066 mm, i.e. the focal plane of the maximum field angle and the focal plane of the center are only 6 microns different.
Referring to fig. 12, the data can be reflected in the graph to obtain that when the spatial frequency of all incident angles reaches 200 line pairs per millimeter, the lens resolution reaches 200 line pairs per millimeter, and the line pairs with the pitch of five micrometers can be resolved.
The existing optical focusing lens is basically designed under the application scene of observing or acting on the surface of an object. In the application scenario of the optical lens provided in this embodiment, the laser beam needs to transmit through the glass slide and the cornea of the biological eye with a certain thickness, and acts in the cornea. The existing optical focusing lens is unsuitable for being applied to ophthalmic surgery due to the fact that the action point is in the cornea, extra aberration is generated, action light spots are enlarged, and the like.
Referring to fig. 13, since the optical lens provided in the present embodiment is used on the femtosecond laser, too many lenses generate group velocity delay dispersion, and spread the femtosecond laser to reduce the characteristic of high pulse energy specific to the femtosecond laser. It is therefore necessary to subject the laser beam to negative dispersion broadening before it passes through the lens in use. The positive dispersion effect generated by the lens is neutralized.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (8)
1. An optical lens for laser surgery, comprising, in order from an object side to an image side along an optical axis:
The first lens with negative focal power has a concave object side surface and a convex image side surface;
the second lens with positive focal power has a convex object side surface and a convex image side surface;
the object side surface and the image side surface of the third lens are convex;
a fourth lens element with positive refractive power having a convex object-side surface and a concave image-side surface;
a fifth lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
a sixth lens element with negative refractive power having a concave object-side surface and a convex image-side surface;
A seventh lens element with positive refractive power having a convex object-side surface and a planar image-side surface;
an eighth lens element with negative refractive power having a planar object-side surface and a concave image-side surface;
A ninth lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
the tenth lens with positive focal power has a convex object-side surface and a concave image-side surface.
2. An optical lens for laser surgery according to claim 1,
The effective focal length of the optical lens is 62.5mm.
3. An optical lens for laser surgery according to claim 1,
The system f-number of the optical lens is 1.25.
4. An optical lens for laser surgery according to claim 1,
The entrance pupil diameter of the optical lens is 50mm.
5. An optical lens for laser surgery according to claim 1,
The optical total length of the optical lens is 160mm.
6. An optical lens for laser surgery according to claim 1,
The angle of view of the optical lens is-4.5 to +4.5 degrees.
7. An optical lens for laser surgery according to claim 1,
The optical lens is used for a femtosecond laser with the wavelength of 1030 nm.
8. An optical lens for laser surgery according to claim 7,
The scanning range of the optical lens is a circular range with the diameter of 10 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202411198969.4A CN118818726B (en) | 2024-08-29 | 2024-08-29 | Optical lens for laser surgery |
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| CN202411198969.4A CN118818726B (en) | 2024-08-29 | 2024-08-29 | Optical lens for laser surgery |
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| CN118818726B true CN118818726B (en) | 2025-11-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN119224980B (en) * | 2024-12-03 | 2025-03-11 | 国科温州研究院(温州生物材料与工程研究所) | Standard near-infrared laser high-precision scanning cutting photoetching objective lens |
| CN121254472A (en) * | 2025-12-05 | 2026-01-02 | 中国科学院西安光学精密机械研究所 | An optical component and a wide-area optical system for detecting space debris. |
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| CN111830671A (en) * | 2019-04-18 | 2020-10-27 | 信泰光学(深圳)有限公司 | Wide-angle lens |
| CN116841020A (en) * | 2023-09-01 | 2023-10-03 | 深圳昇旸光学科技有限公司 | Projection lens and projection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021039813A1 (en) * | 2019-08-30 | 2021-03-04 | 株式会社ニコン | Optical system, methods of manufacturing optical equipment and optical system, variable magnification optical system, and methods of manufacturing optical equipment and variable magnification optical system |
| TWI756070B (en) * | 2021-03-05 | 2022-02-21 | 大立光電股份有限公司 | Optical imaging lens system, image capturing unit and electronic device |
| CN113805317B (en) * | 2021-10-18 | 2024-08-23 | 舜宇光学(中山)有限公司 | Fixed focus lens |
| CN115793361B (en) * | 2023-02-01 | 2023-05-16 | 沂普光电(天津)有限公司 | Ultra-short-focus projection lens and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111830671A (en) * | 2019-04-18 | 2020-10-27 | 信泰光学(深圳)有限公司 | Wide-angle lens |
| CN116841020A (en) * | 2023-09-01 | 2023-10-03 | 深圳昇旸光学科技有限公司 | Projection lens and projection device |
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