CN115437066B - Stepped lens structure for beam shaping and preparation method thereof - Google Patents
Stepped lens structure for beam shaping and preparation method thereof Download PDFInfo
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- CN115437066B CN115437066B CN202211198433.3A CN202211198433A CN115437066B CN 115437066 B CN115437066 B CN 115437066B CN 202211198433 A CN202211198433 A CN 202211198433A CN 115437066 B CN115437066 B CN 115437066B
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- optical fiber
- adhesive
- photo
- photopolymerization
- polymerization
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- 238000007493 shaping process Methods 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 239000013307 optical fiber Substances 0.000 claims abstract description 96
- 239000000853 adhesive Substances 0.000 claims abstract description 63
- 230000001070 adhesive effect Effects 0.000 claims abstract description 63
- 239000003292 glue Substances 0.000 claims abstract description 44
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 42
- 239000000758 substrate Substances 0.000 claims abstract description 32
- 230000003287 optical effect Effects 0.000 claims abstract description 15
- 230000000379 polymerizing effect Effects 0.000 claims abstract description 6
- 238000007598 dipping method Methods 0.000 claims abstract description 5
- 239000000835 fiber Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000001459 lithography Methods 0.000 description 3
- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical compound [Cl-].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=CC=C1C(O)=O PYWVYCXTNDRMGF-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/262—Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/0994—Fibers, light pipes
Abstract
The invention discloses a stepped lens structure for beam shaping and a preparation method thereof, which belongs to the field of laser shaping, and comprises the following steps: the optical fiber comprises an optical fiber core and a photopolymerization adhesive structure, wherein the end face of the optical fiber core is connected with the photopolymerization adhesive structure; the end face of the optical fiber core is used for obtaining a photopolymerization adhesive structure; the optical polymerization glue structure is used for modulating the light beam transmitted by the optical fiber core, emitting and shaping the light beam, and adopts a multi-stage ladder structure. The preparation method of the stepped lens structure comprises the following steps: acquiring an optical fiber substrate grown by a photopolymerization adhesive structure; dipping the optical fiber substrate in the photopolymerization adhesive based on the motion device to obtain optical fiber substrate adhesive drops; acquiring a laser light source transmitted by an optical fiber; and polymerizing and curing the optical fiber base adhesive drop based on the laser light source to obtain a photopolymerization adhesive structure, wherein the photopolymerization adhesive structure adopts a multi-stage ladder structure. The invention can realize beam shaping through the stepped lens structure, and has simple operation, low cost and strong practicability.
Description
Technical Field
The invention belongs to the field of laser shaping, and particularly relates to a stepped lens structure for beam shaping and a preparation method thereof.
Background
The gaussian beam is the fundamental mode radiation field emitted by the laser cavity and the intensity distribution over the cross section follows a gaussian function. With the development of the fields of laser communication, particle manipulation, quantum computation and the like, a beam shaping technology for converting a Gaussian beam into a special beam plays an irreplaceable role. To date, beam shaping has been achieved mainly by means of diffractive optical elements, microlens arrays, long focal depth shaping systems, liquid crystal spatial light modulators, lens groups and special optical fibers.
In the prior art, the characteristics of laser in the transmission process are changed by means of phase compensation after the diffractive optical element, so that the purpose of beam shaping can be achieved, but the manufactured diffractive optical element is limited by the processing level, and the diffraction efficiency is low. The method for realizing beam shaping by adopting the micro lens array has low energy utilization rate and poor shaping effect. The long focal depth element in the long focal depth shaping system is difficult to manufacture, the processing cost is high, and the processing precision is poor. The liquid crystal spatial light modulator has lower laser damage resistance threshold value and cannot meet the requirement of high-power laser processing. The two-photon polymerization 3D printing technology is simple to operate, can manufacture various 3D structures, but needs to be matched with a corresponding two-photon lithography system, and has long preparation time in the early stage.
Disclosure of Invention
The invention aims to provide a stepped lens structure for beam shaping and a preparation method thereof, which are used for solving the problems of low diffraction efficiency, low processing cost and the like of a diffraction optical element in the prior art. The preparation method of the stepped lens structure provided by the invention is simple to operate and low in cost, and provides a new technical approach for optical fiber sensing, optical communication and optical manipulation.
In order to achieve the above object, the present invention provides a stepped lens structure for beam shaping and a method for manufacturing the same, comprising: the optical fiber comprises an optical fiber core and a photopolymerization adhesive structure, wherein the end face of the optical fiber core is connected with the photopolymerization adhesive structure;
the end face of the optical fiber core is used for obtaining the photo-polymerization glue structure;
the optical polymerization glue structure is used for modulating the light beam transmitted by the optical fiber core and emitting and shaping the light beam, and the optical polymerization glue structure adopts a multi-section ladder structure.
Preferably, the end face of the fiber core is used to provide a growth substrate for the stepped lens structure, wherein the fiber uses multimode fibers.
Preferably, the light beam is integrated by modulating a lateral light field of the light beam by the photo-polymerization glue structure to obtain a shaped light beam.
In order to achieve the technical purpose, the invention also provides a preparation method of the stepped lens structure for beam shaping, which comprises the following steps:
acquiring an optical fiber substrate grown by a photopolymerization adhesive structure;
dipping the optical fiber substrate in the photopolymerization adhesive based on a motion device to obtain optical fiber substrate adhesive drops;
acquiring a laser light source transmitted by an optical fiber; and based on the laser light source, polymerizing and curing the optical fiber base adhesive drop to obtain a photopolymerization adhesive structure, wherein the photopolymerization adhesive structure adopts a multi-stage ladder structure.
Preferably, the process of obtaining the optical fiber substrate grown by the photo-polymerization glue structure comprises the following steps:
and stripping one end of the optical fiber to expose the bare optical fiber, and cleaning and cutting the bare optical fiber to obtain the optical fiber substrate with the photo-polymerization adhesive structure growing.
Preferably, the process of obtaining the optical fiber base adhesive drop comprises the following steps:
and dropwise adding the photo-polymerization glue on a sample table, and inserting the optical fiber substrate into the photo-polymerization glue based on a motion device, wherein the optical fiber substrate dips the photo-polymerization glue to obtain an optical fiber substrate glue drop.
Preferably, the process for obtaining the photo-polymerized glue structure comprises the following steps:
and cleaning the other end face of the optical fiber, connecting the other end face of the optical fiber after the treatment with a laser light source through an optical fiber coupler, and polymerizing and curing the optical fiber base adhesive drop by adjusting the optical power of the laser light source to obtain the photopolymerization adhesive structure.
Preferably, after the light beam is modulated by the photo-polymerization glue structure, the converging focus of the emergent shaping light beam is outside the photo-polymerization glue structure.
The invention has the technical effects that:
the invention provides a stepped lens structure for beam shaping and a preparation method thereof, wherein an optical fiber substrate is dipped with photo-polymerization glue through a motion device to obtain optical fiber substrate glue drops; and polymerizing and curing the optical fiber base adhesive drop by a laser light source to obtain a photopolymerization adhesive structure, wherein the photopolymerization adhesive structure adopts a multi-stage ladder structure.
The stepped lens structure provided by the invention is independent of an optical element, has small volume and low manufacturing cost, and can realize beam shaping; compared with a two-photon lithography system, the invention performs beam shaping through the stepped lens structure, has simple structure and low operation difficulty, and does not need early preparation work; meanwhile, the refractive index of the photo-polymerization adhesive is larger than that of the fiber core of the optical fiber, so that the light beam converging capability is strong, and the shaping effect is good.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, illustrate and explain the application and are not to be construed as limiting the application. In the drawings:
FIG. 1 is a schematic view of a photo-polymerization structure at an angle of 30℃in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a step lens structure according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an embodiment of the present invention in which the emergent light field is observed under rhodamine solution;
FIG. 4 is a schematic diagram of a simulation of beam shaping by a 30℃angle photopolymerization structure according to an embodiment of the present invention;
the device comprises a 1-optical fiber core, a 2-photopolymerization rubber structure, a 3-three-dimensional motion platform, a 4-sample stage, a 5-photopolymerization rubber liquid, a 6-CCD camera, a 7-optical fiber coupler, an 8-laser light source and a 9-rhodamine solution.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.
Example 1
As shown in fig. 1, the present embodiment provides a stepped lens structure for beam shaping, which includes an optical fiber core and a photo-polymerization adhesive structure, and the refractive index of the photo-polymerization adhesive is higher than that of the optical fiber core.
The optical fiber in the embodiment is a multimode optical fiber, the photopolymerization adhesive is ultraviolet light curing adhesive, the photopolymerization adhesive structure is a four-section stepped lens type structure, the length is 100 mu m, the angle is 30 degrees, the optical fiber is self-grown on the end face of the optical fiber in a photopolymerization mode, light transmitted by the fiber core of the optical fiber is subjected to refraction and reflection in the photopolymerization adhesive structure, and after the transverse light field is changed, light beam recombination is carried out, so that the light beam shaping purpose is realized.
The beneficial effects of the embodiment are that:
the embodiment has the advantages of simple operation, low manufacturing cost and strong practicability, the structure length and the angle of the photo-polymerization adhesive are controllable, the structure length and the angle of the photo-polymerization adhesive are changed, and the focal position of the laser beam modulated by the photo-polymerization adhesive is changed along with the change. The laser beam modulated by the invention can be used for three-dimensional capture and control of micro-nano particles.
The stepped lens structure provided by the embodiment is independent of an optical element, has small volume and can realize beam shaping; compared with a two-photon lithography system, the method has the advantages that the beam shaping is performed through the stepped lens structure, the method is simple in structure and low in operation difficulty, and early preparation work is not needed; meanwhile, the refractive index of the photo-polymerization adhesive is larger than that of the fiber core of the optical fiber, so that the light beam converging capability is strong, and the shaping effect is good.
Example two
As shown in fig. 2, the preparation method of the stepped lens structure for beam shaping specifically includes the following steps:
step 1: taking a multimode optical fiber, stripping a coating layer by using a wire stripper to expose the bare fiber, and cleaning and cutting the bare fiber; the processed optical fiber is vertically fixed by a three-dimensional motion platform 3, the three-dimensional motion platform 3 is adjusted to enable the optical fiber to be positioned above a sample platform 4, and the end face of the optical fiber is used as a growth substrate of a photopolymerization adhesive structure 2;
step 2: the other end of the multimode fiber is subjected to cleaning and cutting treatment, and the end face of the treated fiber is connected with an ultraviolet laser source 8 by a fiber coupler 7;
step 3: dropping ultraviolet light curing glue liquid 5 on the sample stage 4 for preparing the photo-polymerization glue structure 2;
step 4: adjusting the three-dimensional motion platform 3 to insert an optical fiber substrate into the ultraviolet curing glue liquid 5, controlling the distance between the optical fiber substrate and the sample platform 4, dipping a small amount of polymeric glue, and forming glue drops under the action of surface tension; turning on an ultraviolet laser source 8, adjusting the light power, wherein the ultraviolet light curing glue 5 generates a photopolymerization effect on the optical fiber substrate, and a section of photopolymerization glue structure 2 grows on the optical fiber substrate; turning off the ultraviolet laser source 8;
step 5: taking down the optical fiber end growing the photopolymerized glue structure, cleaning the optical fiber end and the sample table 4, and vertically fixing the optical fiber end above the sample table 4 again after cleaning; dripping ultraviolet light curing glue liquid 5 on the sample table 4 again, controlling the three-dimensional motion platform 3 to insert the cleaned optical fiber end into the ultraviolet light curing glue liquid 5, dipping a small amount of polymerization glue, forming glue drops under the action of surface tension, opening an ultraviolet laser light source 8, and growing a section of photopolymerization glue structure 2 on the optical fiber end; repeating the above operation for 3 times; due to the limitation of the distance between the optical fiber substrate and the sample stage 4 and the influence of the surface tension of the ultraviolet curing glue liquid 5, as shown in fig. 1, a stepped lens type photo-polymerization glue structure 2 is finally formed, wherein the photo-polymerization glue structure 2 is divided into four sections, the length is 100 μm, and the angle is 30 degrees;
in this embodiment, the photo-polymerization glue structure is cleaned, the step 4 is repeated for a plurality of times, the length and the angle of the photo-polymerization glue structure are adjusted, and finally the trapezoid lens type photo-polymerization glue structure meeting the beam shaping requirement is formed;
in this embodiment, the photo-polymerization glue structure may be prepared by performing the step 4 only once, or may be prepared by repeating the step 4 multiple times.
Step 6: as shown in fig. 3, the finally formed step lens structure is removed, unreacted polymer liquid is cleaned by using a solution such as ethanol, and an optical fiber with the step lens structure is horizontally fixed by the three-dimensional motion platform 3; adjusting the three-dimensional moving object table 3 to move the photopolymerization adhesive structure 2 onto the sample table 4, and connecting the other end of the optical fiber with a 532nm green light source; dropping rhodamine solution 9 above the photopolymerization gum structure 2, and observing a light field modulated by the photopolymerization gum structure 2 under the rhodamine solution 9 through a CCD camera 6; the light beam is reflected in the photopolymerization adhesive structure 2, light beam reshaping is carried out, convergence is finally carried out at a position 10 mu m away from the end face of the photopolymerization adhesive structure 2, and the simulation convergence result is shown in fig. 4, so that the light beam reshaping purpose is realized; in addition, the light beam shaped by the photo-polymerization glue structure 2 can be used for three-dimensional capturing and controlling of micro-nano particles.
In this embodiment, after the light-polymerizing glue structure is modulated, the converging focus of the outgoing beam should be located outside the light-polymerizing glue.
The foregoing is merely a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (5)
1. A stepped lens arrangement for beam shaping, comprising: the optical fiber comprises an optical fiber core and a photopolymerization adhesive structure, wherein the end face of the optical fiber core is connected with the photopolymerization adhesive structure;
the end face of the optical fiber core is used for obtaining the photo-polymerization glue structure;
the process for obtaining the photo-polymerization adhesive structure comprises the following steps:
dropwise adding a photo-polymerization adhesive on a sample table, and inserting the optical fiber substrate into the photo-polymerization adhesive based on a motion device, wherein the optical fiber substrate dips the photo-polymerization adhesive to obtain an optical fiber substrate adhesive drop;
the other end face of the optical fiber is cleaned, the other end face of the optical fiber after the treatment is connected with a laser light source through an optical fiber coupler, and the optical fiber base adhesive drops are polymerized and cured through adjusting the optical power of the laser light source to obtain a photopolymerization adhesive structure;
the optical polymerization glue structure is used for modulating the light beam transmitted by the optical fiber core, emitting and shaping the light beam, and adopts a multi-section ladder structure;
the photopolymerized glue structure integrates the light beams by modulating the transverse light field of the light beams to obtain shaped light beams.
2. The stepped lens structure for beam shaping according to claim 1, wherein said end face of said fiber core is adapted to provide a growth substrate for said stepped lens structure, wherein said optical fiber is a multimode optical fiber.
3. A method of manufacturing a stepped lens structure for beam shaping, comprising the steps of:
acquiring an optical fiber substrate grown by a photopolymerization adhesive structure;
dipping the optical fiber substrate in the photopolymerization adhesive based on a motion device to obtain optical fiber substrate adhesive drops;
acquiring a laser light source transmitted by an optical fiber; based on the laser light source, polymerizing and curing the optical fiber base adhesive drop to obtain a photopolymerization adhesive structure, wherein the photopolymerization adhesive structure adopts a multi-stage ladder structure;
the photopolymerized glue structure integrates the light beams by modulating the transverse light field of the light beams to obtain shaped light beams;
the process for obtaining the optical fiber base adhesive drop comprises the following steps:
dropwise adding a photo-polymerization adhesive on a sample table, and inserting the optical fiber substrate into the photo-polymerization adhesive based on a motion device, wherein the optical fiber substrate dips the photo-polymerization adhesive to obtain an optical fiber substrate adhesive drop;
the process for obtaining the photo-polymerization adhesive structure comprises the following steps:
and cleaning the other end face of the optical fiber, connecting the other end face of the optical fiber after the treatment with a laser light source through an optical fiber coupler, and polymerizing and curing the optical fiber base adhesive drop by adjusting the optical power of the laser light source to obtain the photopolymerization adhesive structure.
4. A method of preparing a stepped lens structure for beam shaping according to claim 3, wherein the step of obtaining a fiber substrate on which a photo-polymerizable gel structure is grown comprises:
and stripping one end of the optical fiber to expose the bare optical fiber, and cleaning and cutting the bare optical fiber to obtain the optical fiber substrate with the photo-polymerization adhesive structure growing.
5. A method of manufacturing a stepped lens structure for beam shaping according to claim 3, wherein the converging focus of the outgoing shaped beam is outside the photo-polymerized glue structure after the beam has been modulated by the photo-polymerized glue.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211198433.3A CN115437066B (en) | 2022-09-29 | 2022-09-29 | Stepped lens structure for beam shaping and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211198433.3A CN115437066B (en) | 2022-09-29 | 2022-09-29 | Stepped lens structure for beam shaping and preparation method thereof |
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| Publication Number | Publication Date |
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| CN115437066A CN115437066A (en) | 2022-12-06 |
| CN115437066B true CN115437066B (en) | 2024-03-29 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0260742A1 (en) * | 1986-09-10 | 1988-03-23 | Koninklijke Philips Electronics N.V. | Optical transmission fibre having a tapered end portion provided with a lens |
| JPH10221547A (en) * | 1997-02-06 | 1998-08-21 | Hitachi Ltd | Optical fiber with lens and its manufacture |
| JP2002221627A (en) * | 2001-01-24 | 2002-08-09 | Yazaki Corp | Method for manufacturing optical fiber |
| JP2006150751A (en) * | 2004-11-29 | 2006-06-15 | Sharp Corp | Method for producing three-dimensional structure and micro lens |
| JP2008176135A (en) * | 2007-01-19 | 2008-07-31 | Alnair Labs:Kk | Optical waveguide structure body, method of manufacturing the same, mode synchronization optical fiber laser apparatus, method of depositing fine particles and method of extracting particles |
| KR20100083992A (en) * | 2009-01-15 | 2010-07-23 | 연세대학교 산학협력단 | Method for menufacturing a photonic device using optical fibers, photonic device using optical fibers and optical tweezer |
| JP2011248022A (en) * | 2010-05-25 | 2011-12-08 | Kohoku Kogyo Co Ltd | Diffusing optical fiber and optical component for medical use using such diffusing optical fiber |
-
2022
- 2022-09-29 CN CN202211198433.3A patent/CN115437066B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0260742A1 (en) * | 1986-09-10 | 1988-03-23 | Koninklijke Philips Electronics N.V. | Optical transmission fibre having a tapered end portion provided with a lens |
| JPH10221547A (en) * | 1997-02-06 | 1998-08-21 | Hitachi Ltd | Optical fiber with lens and its manufacture |
| JP2002221627A (en) * | 2001-01-24 | 2002-08-09 | Yazaki Corp | Method for manufacturing optical fiber |
| JP2006150751A (en) * | 2004-11-29 | 2006-06-15 | Sharp Corp | Method for producing three-dimensional structure and micro lens |
| JP2008176135A (en) * | 2007-01-19 | 2008-07-31 | Alnair Labs:Kk | Optical waveguide structure body, method of manufacturing the same, mode synchronization optical fiber laser apparatus, method of depositing fine particles and method of extracting particles |
| KR20100083992A (en) * | 2009-01-15 | 2010-07-23 | 연세대학교 산학협력단 | Method for menufacturing a photonic device using optical fibers, photonic device using optical fibers and optical tweezer |
| JP2011248022A (en) * | 2010-05-25 | 2011-12-08 | Kohoku Kogyo Co Ltd | Diffusing optical fiber and optical component for medical use using such diffusing optical fiber |
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| CN115437066A (en) | 2022-12-06 |
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