CN113872032A - Multi-wavelength multi-light-beam combining system, coupling lens and design method - Google Patents
Multi-wavelength multi-light-beam combining system, coupling lens and design method Download PDFInfo
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- CN113872032A CN113872032A CN202111061890.3A CN202111061890A CN113872032A CN 113872032 A CN113872032 A CN 113872032A CN 202111061890 A CN202111061890 A CN 202111061890A CN 113872032 A CN113872032 A CN 113872032A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094049—Guiding of the pump light
- H01S3/094053—Fibre coupled pump, e.g. delivering pump light using a fibre or a fibre bundle
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- 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
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4206—Optical features
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- 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
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4296—Coupling light guides with opto-electronic elements coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources
Abstract
A multi-wavelength and multi-light beam combining system, a coupling lens and a design method belong to the field of optical fiber application. The method comprises the steps of S01, obtaining Gaussian beams of three beams of laser to be coupled; step S02, adjusting Gaussian beams of the three beams of laser to be on the same optical axis, fitting to form a new Gaussian beam and obtaining a complex amplitude function of the new Gaussian beam; step S03, determining the focal length of the coupling lens according to the complex amplitude function of the Gaussian beam, the lens imaging formula and the phase matching equation of the Gaussian beam; and step S04, under the condition of satisfying equal optical path, optimizing the transverse light intensity distribution of the output light beam by changing the curvature distribution of the optical surface, and converting from Gaussian distribution to uniform distribution to obtain the coupling lens with the free-form surface. The coupling lens is designed by adopting the method. The system comprises red, green and blue lasers, a reflector, a first dichroic mirror, a second dichroic mirror, the coupling lens and a transmission optical fiber. The invention can generate LD fiber light guide white light source with high brightness and long service life, and has high coupling efficiency.
Description
Technical Field
The invention relates to the technical field of laser, in particular to a multi-wavelength multi-beam combined coupling lens system, a coupling lens and a design method.
Background
To realize high power output, multiple laser coupling integration is necessary. In the prior art, a laser light source adopts a scheme of optical fiber coupling, namely a technology of coupling light sources emitted by a plurality of lasers into optical fibers, one optical fiber corresponds to 1 or a plurality of lasers, and when laser beams enter the optical fibers through the end faces of the optical fibers, the light efficiency is lower than 85%. Also, a plurality of coupling lenses are required in the coupling process.
The invention patent CN206369871U discloses a high-power RGB (red, green and blue) synthesized laser light source system, and particularly discloses that the system comprises a blue laser, a red laser, a green laser, a first coupling lens group, a second coupling lens group, a third coupling lens group, a fourth coupling lens group, a first dichroic mirror, a second dichroic mirror and a square dodging optical fiber, wherein the first dichroic mirror and the second dichroic mirror form an angle of 45 degrees with a laser beam of the blue laser, the second coupling lens group and the red laser are sequentially arranged right below the first dichroic mirror, the third coupling lens group and the green laser are sequentially arranged right below the second dichroic mirror, a laser beam emitted by an emitting end of the green laser faces the third coupling lens group and is reflected on the second dichroic mirror, and the reflected laser beam is emitted into the square dodging optical fiber. The system can combine three color lights to realize high-power white laser output. However, the system needs four coupling lens groups, wherein three coupling lens groups are arranged at the laser emitting end of each laser, and then the three color lights are converged and coupled into the optical fiber through the fourth coupling lens group. Each coupling lens group in the system is composed of two symmetrically arranged coupling lenses, and the prior art does not provide a coupling lens capable of efficiently coupling a plurality of beams of light into an optical fiber, but utilizes the existing lenses for combination. Moreover, the system needs to rely on more optical devices, and if uniform and efficient laser output is to be realized, the requirement on three coupling lens groups arranged at the exit end of the laser is high.
Disclosure of Invention
The invention provides a multi-wavelength multi-light beam combination coupling lens system, a coupling lens and a design method aiming at the problems in the prior art, which can utilize one coupling lens to couple a plurality of beams of light into a transmission optical fiber and can generate a white light source with high brightness and long service life; and with this system, coupling efficiencies of greater than 85% can be achieved with fewer optics and simple optical path arrangements.
The invention is realized by the following technical scheme:
a design method of a multi-wavelength multi-light beam combining optical fiber coupling lens comprises the following steps:
step S01, obtaining Gaussian beams of three beams of laser to be coupled;
step S02, adjusting Gaussian beams of the three beams of laser to be on the same optical axis, fitting to obtain envelopes of the three Gaussian beams, using the envelopes as new Gaussian beams, and obtaining complex amplitude functions of the new Gaussian beams;
wherein the content of the first and second substances,
is the spot radius at z of the gaussian beam,
is the beam waist radius of the gaussian beam,
is the radius of curvature at z for a gaussian beam,
is the phase of the gaussian beam at z,
is the amplitude of each point on the gaussian beam, z is the point on the optical axis,
the distance from a point on the spot radius to the beam central axis,
is a unit of an imaginary number,
is the wave vector;
step S03, determining the focal length of the coupling lens according to the complex amplitude function of the new Gaussian beam, the lens imaging formula and the phase matching equation of the Gaussian beam obtained in the step S02;
the lens imaging formula is as follows:
(ii) a Wherein the content of the first and second substances,
in order to couple the radii of the exit face of the lens,
in order to couple the radii of the entrance faces of the lenses,
is the focal length of the coupling lens;
the phase matching equation of the Gaussian beam:
；
wherein the content of the first and second substances,
is the radius of curvature of the incident gaussian beam,
is the radius of curvature of the emerging gaussian beam,
is the phase of the incident gaussian beam,
the phase of the emergent Gaussian beam;
step S04, under the condition that the optical path of each ray of the Gaussian beam coupled to the transmission fiber is equal after the light of the Gaussian beam incident end passes through the medium, the transverse light intensity distribution of the output light beam is optimized by changing the curvature distribution of the optical surface, and the transverse light intensity distribution is changed from Gaussian distribution to uniform distribution, so that the coupling lens with the free-form surface is finally obtained.
The invention fits a new Gaussian beam according to the Gaussian beams of a plurality of lasers to be coupled, and then determines the structure of the coupling lens according to the light effect of the light beams coupled into a mixed beam entering the transmission fiber. The coupling lens can couple multiple light beams into the transmission optical fiber to output uniform and efficient light source.
Preferably, the three laser beams coupled by the coupling lens are adapted to the numerical aperture of the transmission fiber.
Preferably, the medium is organic glass.
A coupling lens is designed by adopting the design method of the multi-beam coupling lens.
A multi-wavelength multi-beam combination optical fiber coupling system comprises a red laser, a green laser, a blue laser, a reflector arranged at the laser emergent end of the red laser, a first dichroic mirror arranged at the laser emergent end of the green laser, a second dichroic mirror arranged at the laser emergent end of the blue laser, a coupling lens and a transmission optical fiber; the reflector, the first dichroic mirror, the second dichroic mirror, the coupling lens and the transmission optical fiber are sequentially arranged on the same horizontal line from left to right, so that red light emitted by the red laser is reflected by the reflector, green light emitted by the green laser is reflected by the first dichroic mirror, blue light emitted by the blue laser is reflected by the second dichroic mirror and collected on the same optical axis, and the red light beam, the green light beam and the blue light beam are coupled into the transmission optical fiber through the coupling lens.
The system has simple optical path arrangement, and the optical axes of the three laser beams are converged on the same optical axis through the reflector and the two dichroic mirrors; and then, the mixed light beam is coupled into the transmission optical fiber by using a coupling lens, so that a white light source with high brightness and long service life can be obtained. The system has high coupling efficiency which is more than 85 percent.
Preferably, the red laser, the green laser and the blue laser are arranged in parallel in sequence.
Preferably, the red light emitted by the red laser and the light reflected by the reflector form a 90-degree included angle, the green light emitted by the green laser and the light reflected by the first dichroic mirror form a 90-degree included angle, and the blue light emitted by the blue laser and the light reflected by the second dichroic mirror form a 90-degree included angle.
Preferably, the transmission fiber is a multimode fiber.
Preferably, the system further comprises a power control circuit, which is respectively connected with the red laser, the green laser and the blue laser and is used for controlling the light source power of the red laser, the green laser and the blue laser.
The invention has the following beneficial effects:
a multi-wavelength multi-beam combined coupling lens system, a coupling lens and a design method are provided, the design method is simple, a coupling lens can be designed to couple multi-beams into a transmission optical fiber, and a light source with uniform coupling output and high efficiency can be coupled out; the system can couple the three primary colors into the transmission optical fiber through the lens by using fewer optical devices and simply arranging the optical paths, and can obtain a white light source with high brightness and long service life.
Drawings
FIG. 1 is a flow chart of a method for designing a multi-wavelength multi-beam combining coupling lens according to the present invention;
FIG. 2 is a schematic diagram of Gaussian beams in steps S01 and S02 of the design method of the multi-wavelength multi-beam combining and coupling lens of the present invention;
FIG. 3 is a schematic diagram illustrating the principle of transmission of Gaussian beams through a medium in step S03 in the method for designing a multi-wavelength and multi-beam combining and coupling lens according to the present invention;
FIG. 4 is a graph of the change in radius of curvature of a Gaussian beam through a medium during transmission of FIG. 3;
FIG. 5 is a schematic structural diagram of a multi-wavelength multi-beam combining optical fiber coupling system according to the present invention;
FIG. 6 is a light effect diagram of a designed coupling lens; f is a point G of a light source emergent point which passes through a point P on the free-form surface and then is refracted to the receiving surface;
fig. 7 is a schematic diagram of a free-form surface design of a coupling lens.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
Referring to fig. 1, the design method of a multi-wavelength multi-beam combining fiber coupling lens of the present invention includes:
step S01, obtaining Gaussian beams of three beams of laser to be coupled;
step S02, adjusting the Gaussian beams of the three beams of laser to be on the same optical axis, fitting to obtain the envelopes of the three Gaussian beams, taking the envelopes as new Gaussian beams, and obtaining the complex amplitude function of the new Gaussian beams:
wherein the content of the first and second substances,
is the spot radius at z of the gaussian beam,
is the beam waist radius of the gaussian beam,
is the radius of curvature at z for a gaussian beam,
is the phase of the gaussian beam at z,
is the amplitude of each point on the gaussian beam, z is the point on the optical axis,
the distance from a point on the spot radius to the beam central axis,
is a unit of an imaginary number,
is the wave vector;
step S03, determining the focal length of the coupling lens according to the complex amplitude function of the new Gaussian beam, the lens imaging formula and the phase matching equation of the Gaussian beam obtained in the step S02;
the lens imaging formula is as follows:
(ii) a Wherein the content of the first and second substances,
in order to couple the radii of the exit face of the lens,
in order to couple the radii of the entrance faces of the lenses,
is the focal length of the coupling lens;
the phase matching equation of the Gaussian beam:
；
wherein the content of the first and second substances,
is the radius of curvature of the incident gaussian beam,
is the radius of curvature of the emerging gaussian beam,
is the phase of the incident gaussian beam,
the phase of the emergent Gaussian beam;
step S04, under the condition that the optical path of each ray of the Gaussian beam coupled to the transmission fiber is equal after the light of the Gaussian beam incident end passes through the medium, the transverse light intensity distribution of the output light beam is optimized by changing the curvature distribution of the optical surface, the Gaussian distribution is changed to uniform distribution, and the free-form-surface coupling lens is finally obtained.
In step S01, the specific process of obtaining gaussian beams of three lasers to be coupled includes: the curve of the complete gaussian beam and the specific parameters are obtained by measuring the light intensity distribution of the beam emitted by each LD. The specific parameters include the beam waist position, the Rayleigh distance, the section radius and the like of the Gaussian beam.
In step S01, the three laser beams exhibit a hyperbolic distribution, see dashed curves 1, 2, 3 in fig. 2. For example, the three laser beams are red light, green light, and blue light, respectively, after the three laser beams are obtained, step S02 is executed, gaussian beams of the three laser beams are adjusted on the same optical axis, the hyperbolic curves of the three laser beams are fitted as much as possible, and finally, the envelope surface of the hyperbolic curves of the three laser beams is obtained as a new gaussian beam hyperbolic curve (i.e., the new gaussian beam determined in step S02 is also the gaussian beam incident on the coupling lens), see solid curve 4 in fig. 2. In fig. 2, 5 is the beam waist of the gaussian beam, and 6 is the optical axis of the gaussian beam.
In obtaining a new complex amplitude function of the Gaussian beam, the spot half of the Gaussian beam at zThe diameter is calculated by the following formula:
wherein z is0A point on the optical axis, which takes the distance from the optical axis to the beam waist; the radius of curvature of the gaussian beam is calculated by the following formula:
(ii) a The beam waist radius of the gaussian beam is calculated by the following formula:
wherein, the wavelength of the Gaussian beam. The phase of the gaussian beam is calculated by the following formula:
。
the step S03 specifically includes:
step S31, calculating the focal length of the coupling lens according to the lens imaging formula and the phase matching equation of the Gaussian beam;
referring to fig. 3, after passing through a medium (e.g., a thin lens), the emitted light beam is still gaussian. In the figure, 7 is the distance from the incident gaussian beam to the lens, 8 is the distance from the emergent gaussian beam to the lens, 11 is the radius of curvature of the spherical wave of the incident gaussian beam, and 12 is the radius of curvature of the spherical wave of the emergent gaussian beam. In fig. 4, 13 is the radius of curvature of the incident gaussian beam, 14 is the approximate spherical wave of the incident gaussian beam, and 14 passes through 16 media (made of organic glass, or other transparent materials), and then the propagation velocity of the center in the media
Speed on both sides
(wherein
) Finally, an approximately spherical wave 15 is formed through the medium. In determining to beAnd when the focal length of the coupling lens is designed, calculating according to a Gaussian beam equation, a lens imaging formula and a phase matching equation of the Gaussian beam. Wherein the content of the first and second substances,
and
the phases from the same gaussian beam, so they are equal. R is approximately the radius of curvature R of the incident Gaussian beam, knowing the focal length of the coupling lens designed
。
Step S32, calculating the beam waist position of the emergent Gaussian beam by using the Gaussian beam equation obtained in the step S02; and placing the transmission optical fiber at the beam waist position of the emergent Gaussian beam obtained through calculation. The power of the end of the transmission fiber is calculated when the power does not pass through the coupling lens
Transmitting power at the end of an optical fiber through a coupling lens
And then calculating the coupling efficiency
. When the coupling efficiency does not reach the optimal coupling efficiency, for example, less than 85%, the position of the laser light source to the coupling lens is adjusted, the steps S31 and S32 are repeated until the coupling efficiency reaches the optimal coupling efficiency, and then the focal length under the optimal coupling efficiency is determined to be the final coupling lens focal length. The process of finding the optimal coupling efficiency can be completed by using MATLAB software simulation tests.
In the step S04, the determination of the free-form surface may be implemented based on Snell formula transmissive clipping method, ellipsometry, ovoid method, and the like. The following description will be made by taking the ovoid surface method as an example, and referring to FIG. 7 in detail, the origin of the light source is at
Point, point
Is a point at which the light rays converge,
is the projection point of point P on the plane XOY; order to
At a refractive index of
In the medium of (1);
at a refractive index of
In the medium of (1).
from the optical properties of the cartesian ovoid:
Namely:
the curve of the free-form surface is determined according to the above procedure.
By changing the curvature distribution of the optical surface, optimizing the transverse light intensity distribution of the output light beam by an ovoid surface method and continuously adjusting the K value, the energy distribution on each sub-surface is uniform, and the transition from Gaussian distribution to uniform distribution is carried out to avoid burning out the optical fiber head, and finally the coupling lens with the free-form surface is obtained.
Referring to FIG. 6, the laser is placed at F point, the convex lens is placed at G point, and the optical path constant formula is used
The arrangement position of the oval-shaped surface type free-form surface lens is adjusted. Wherein, P is a moving point on the free-form surface lens with the oval surface,
is a constant. After adjustment, the optical path of each light ray coupling to the transmission fiber from the Gaussian beam emergent from the Gaussian beam incident end after passing through the medium is equal, and the light path is equal through an aplanatism formula
And (5) realizing. Where OPL is the optical path length, n is the medium, c, v is the speed of the light in vacuum and the speed in the medium.
Referring to fig. 5, a multi-wavelength and multi-beam combination optical fiber coupling system includes a red laser 11, a green laser 12, a blue laser 13, a reflector 31 disposed at a laser exit end of the red laser 11, a first dichroic mirror 32 disposed at a laser exit end of the green laser 12, a second dichroic mirror 33 disposed at a laser exit end of the blue laser 13, a coupling lens 21 designed according to the above design method, and a transmission optical fiber 22. The reflecting mirror 31, the first dichroic mirror 32, the second dichroic mirror 33, the coupling lens 21, and the transmission fiber 22 are sequentially disposed on the same horizontal line from left to right, so that the red light emitted by the red laser 11 is reflected by the reflecting mirror 31, the green light emitted by the green laser 12 is reflected by the first dichroic mirror 32, the blue light emitted by the blue laser 13 is reflected by the second dichroic mirror 33 and collected on the same optical axis, and the red light, the green light, and the blue light beams are coupled to the transmission fiber 22 through the coupling lens 21. The system utilizes three lasers to emit Gaussian beams with different wavelengths, the beams are shaped and combined on the same optical axis through a reflecting mirror and a dichroic mirror respectively, then the beams enter a transmission optical fiber after being collimated and coupled through a coupling lens, and the combination is finished at the tail end of the optical fiber.
The red laser, the green laser and the blue laser all adopt LD lasers. The red laser, the green laser and the blue laser can be arranged above or below the optical axis. Fig. 5 shows that the red laser, the green laser, and the blue laser are disposed below the optical axis, and the three are sequentially disposed side by side. In order to enable the laser emitted by the three lasers to be converged on the same optical axis after reflection, the reflecting mirror, the first dichroic mirror and the second dichroic mirror are obliquely arranged, and the angles of the laser emitting ends of the red laser, the green laser and the blue laser or the arrangement positions of the lasers can be adjusted according to requirements. For example, a red laser emits red light, which enters a reflector at an angle of 30 degrees and then reflects the red light horizontally. At this time, the red light emitted by the red laser and the light reflected by the first dichroic mirror form an angle of 60 degrees. Similarly, the red laser and the blue laser are arranged in the same way. Preferably, the red light emitted by the red laser 11 and the light reflected by the reflecting mirror 31 form a 90-degree included angle, the green light emitted by the green laser 12 and the light reflected by the first dichroic mirror 32 form a 90-degree included angle, and the blue light emitted by the blue laser 13 and the light reflected by the second dichroic mirror 33 form a 90-degree included angle. Namely, the red laser emits red light, and the red light enters the reflector at an angle of 45 degrees; the green laser is incident into the first dichroic mirror at an angle of 45 degrees; and the blue laser is incident into the second dichroic mirror at 45 degrees.
The reflecting mirror 31, the first dichroic mirror 32 and the second dichroic mirror 33 are processed by corresponding film systems, that is, the second dichroic mirror is processed by a film system allowing red light and green light to pass through and blue light to reflect, the first dichroic mirror 32 is processed by a film system allowing green light to reflect and red light to pass through, and the reflecting mirror 31 is processed by a film system allowing red light to reflect.
The transmission optical fiber is a multimode optical fiber. The light beam transmitted through the coupling lens can be adapted to the numerical aperture NA of the transmission fiber.
The system also comprises a power control circuit which is respectively connected with the red laser, the green laser and the blue laser and used for controlling the light source power of the red laser, the green laser and the blue laser. The power control circuit comprises a control chip, a red light control branch, a green light control branch and a blue light control branch. The control chip is respectively connected with the red light control branch, the green light control branch and the blue light control branch, the red light control branch is connected with the red light laser, the green light control branch is connected with the green light laser, and the blue light control branch is connected with the blue light laser. The control chip is a single chip microcomputer chip. The red light control branch comprises a red light switch controller, and the red light switch controller is provided with a plurality of gear levels to respectively correspond to 0% -100% power selection. The green light control branch comprises a green light switch controller, and the green light switch controller is provided with a plurality of gear levels to respectively correspond to 0% -100% power selection. The blue light control branch comprises a blue light switch controller, and the blue light switch controller is provided with a plurality of gear levels to respectively correspond to 0% -100% power selection. The system controls the color of the emergent light through the power control circuit, and can generate light with different colors such as red, green, blue, white and the like. For example, if the gear of the red light switch controller is adjusted to 100%, and the gear of the green light switch controller and the gear of the blue light switch controller are adjusted to 0%, the color of the final emergent light is red light. For another example, if the gear of the red switch controller is adjusted to 35%, the gear of the green switch controller is adjusted to 100%, and the gear of the blue switch controller is adjusted to 15%, the color of the light emitted finally is white light.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.
Claims (10)
1. A design method of a multi-wavelength multi-light beam combining coupling lens is characterized by comprising the following steps:
step S01, obtaining Gaussian beams of three beams of laser to be coupled;
step S02, adjusting the Gaussian beams of the three beams of laser to be on the same optical axis, fitting to obtain the envelopes of the three Gaussian beams, taking the envelopes as new Gaussian beams, and obtaining the complex amplitude function of the new Gaussian beams:
wherein the content of the first and second substances,
is the spot radius at z of the gaussian beam,
is the beam waist radius of the gaussian beam,
is the radius of curvature at z for a gaussian beam,
is the phase of the gaussian beam at z,
is the amplitude of each point on the gaussian beam, z is the point on the optical axis,
the distance from a point on the spot radius to the beam central axis,
is a unit of an imaginary number,
is the wave vector;
step S03, determining the focal length of the coupling lens according to the complex amplitude function of the new Gaussian beam, the lens imaging formula and the phase matching equation of the Gaussian beam obtained in the step S02;
the lens imaging formula is as follows:
(ii) a Wherein the content of the first and second substances,
in order to couple the radii of the exit face of the lens,
in order to couple the radii of the entrance faces of the lenses,
is the focal length of the coupling lens;
the phase matching equation of the Gaussian beam:
；
wherein the content of the first and second substances,
is the radius of curvature of the incident gaussian beam,
is the radius of curvature of the emerging gaussian beam,
is the phase of the incident gaussian beam,
the phase of the emergent Gaussian beam;
step S04, under the condition that the optical path of each ray of the Gaussian beam coupled to the transmission fiber is equal after the light of the Gaussian beam incident end passes through the medium, the transverse light intensity distribution of the output light beam is optimized by changing the curvature distribution of the optical surface, and the transverse light intensity distribution is changed from Gaussian distribution to uniform distribution, so that the coupling lens with the free-form surface is finally obtained.
2. The method as claimed in claim 1, wherein the numerical aperture of the transmission fiber is adapted to the light beam coupled by the coupling lens.
3. The method as claimed in claim 1, wherein the medium is plexiglass.
4. The method as claimed in claim 1, wherein the new Gaussian beam is an outer-enveloped Gaussian beam, and the new Gaussian beam is coaxial with the three Gaussian beams before fitting and the beam waist positions of the new Gaussian beam and the three Gaussian beams before fitting coincide.
5. A coupling lens, which is designed by the design method of the coupling lens for multi-wavelength and multi-beam combination as claimed in claim 1.
6. A multi-wavelength multi-beam combination optical fiber coupling system is characterized by comprising a red laser, a green laser, a blue laser, a reflector arranged at the laser emergent end of the red laser, a first dichroic mirror arranged at the laser emergent end of the green laser, a second dichroic mirror arranged at the laser emergent end of the blue laser, a coupling lens according to claim 4 and a transmission optical fiber; the reflector, the first dichroic mirror, the second dichroic mirror, the coupling lens and the transmission optical fiber are sequentially arranged on the same horizontal line from left to right, so that red light emitted by the red laser is reflected by the reflector, green light emitted by the green laser is reflected by the first dichroic mirror, blue light emitted by the blue laser is reflected by the second dichroic mirror and collected on the same optical axis, and the red light beam, the green light beam and the blue light beam are coupled into the transmission optical fiber through the coupling lens.
7. The system of claim 6, wherein the red laser, the green laser, and the blue laser are sequentially disposed side by side.
8. The system of claim 6, wherein the red light emitted from the red laser is at a 90 degree angle with respect to the light reflected by the mirror, the green light emitted from the green laser is at a 90 degree angle with respect to the light reflected by the first dichroic mirror, and the blue light emitted from the blue laser is at a 90 degree angle with respect to the light reflected by the second dichroic mirror.
9. The system of claim 6, wherein the transmission fiber is a multimode fiber.
10. The system of claim 6, further comprising a power control circuit respectively connected to the red laser, the green laser, and the blue laser for controlling the power of the red laser, the green laser, and the blue laser.
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| CN103457147A (en) * | 2013-09-13 | 2013-12-18 | 厦门大学 | White light laser module |
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| CN115663587A (en) * | 2022-12-27 | 2023-01-31 | 武汉光谷航天三江激光产业技术研究院有限公司 | Two-dimensional array spectrum synthesis method and system based on free-form surface |
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