Laser coupling optical fiber system for eliminating speckles and laser light source

Abstract

The utility model relates to a speckle-eliminating laser coupling optical fiber system, comprising an incident optical fiber used for generating output light; the collimating lens is arranged on a light path of the output light and is used for converting the output light into parallel light; the converging lens is used for converting the parallel light into converged light; the diffusion sheet module is provided with a diffusion sheet assembly, the convergent light enters the diffusion sheet assembly, and the diffusion sheet assembly inhibits speckles of the convergent light through rotation; and the emergent optical fiber is used for coupling and outputting the converged light after speckle suppression. The utility model provides the laser coupling optical fiber system which can effectively reduce the laser speckle effect and has high light transmittance.

Description

Technical Field

[0001] The utility model relates to the technical field of semiconductor laser light sources, in particular to a laser coupling optical fiber system and a laser light source for eliminating speckles. Background Art

[0002] Laser beams have the characteristics of high brightness, narrow wavelength spectrum, and good transmission directionality after collimation, but this also leads to the speckle characteristics of lasers. The speckle image will affect the image display quality, reduce image resolution, and affect image contrast. In addition, the secondary speckle formed by the speckle will form a scattered pattern in the display space, affecting the perception.

[0003] The light source coupling fiber optic system in the prior art will cause serious diffusion of the fiber, making it difficult to obtain a good coupling effect. The existing speckle elimination technology is mainly based on the speckle suppression principle of superimposing unrelated and statistically independent speckle images, and performs spatial or temporal averaging based on light intensity to achieve speckle suppression. There are also solutions that use the method of superimposing multiple scattering plates to eliminate speckles, but the setting of multiple scattering plates will reduce the light transmission efficiency of the optical system. At present, a new laser coupling fiber optic system is urgently needed to solve the above problems. Utility Model Content

[0004] The embodiments of the present application provide a laser-coupled optical fiber system and a laser light source for eliminating speckles, thereby solving the problems of insufficient speckle suppression, severe light diffusion, and low transmittance in the existing speckle elimination technology; and achieve significant suppression of laser speckle and improvement of the transmittance of laser coupling.

[0005] On the first aspect, in order to solve the above-mentioned technical problems, an embodiment of the utility model provides a laser-coupled fiber system for eliminating speckles, wherein the laser-coupled fiber system comprises: an output fiber, an incident fiber, a collimating lens, an incident lens and a diffuser module, and the diffuser module has a diffuser that can rotate at high speed.

[0006] In one embodiment of the present invention, it includes:

[0007] An input optical fiber for generating output light;

[0008] A collimating lens, disposed on the optical path of the output light, for converting the output light into parallel light;

[0009] A converging lens, used for converting the parallel light into converging light;

[0010] A diffuser module, comprising a diffuser assembly, the converged light is incident on the diffuser assembly, and the diffuser assembly suppresses the speckle of the converged light by rotating; wherein the diffuser assembly comprises a plurality of diffusers, and the plurality of diffusers are sequentially spliced ​​to form a ring structure;

[0011] The output optical fiber is used to output the converged light after the speckle is suppressed.

[0012] In one embodiment of the present invention, the diffuser module includes two groups of diffuser assemblies, namely a first diffuser assembly and a second diffuser assembly. The two groups of diffuser assemblies are arranged in sequence and spliced ​​to form a ring structure.

[0013] In one embodiment of the present invention, the diffusion sheet module includes two groups of diffusion sheet components, namely a first diffusion sheet component and a second diffusion sheet component. The two groups of diffusion sheet components are arranged in sequence and spliced ​​to form a ring structure.

[0014] In one embodiment of the utility model, the first diffuser assembly includes a plurality of first diffusers, the second diffuser assembly includes a plurality of second diffusers, the first diffusers and the second diffusers included in the diffuser module are alternately arranged and spliced ​​to form the annular structure, wherein the scattering angles of the first diffusers and the second diffusers are different.

[0015] In one embodiment of the present invention, the scattering angle of the first scattering sheet is 0.5°-5°.

[0016] In one embodiment of the present invention, the scattering angle of the second scattering sheet is 0.5°-5°.

[0017] In one embodiment of the present invention, the first scattering plate and the second scattering plate are made of quartz, crown glass, flint glass or plastic.

[0018] In one embodiment of the present invention, the scattering surface of the first scattering sheet and / or the second scattering sheet is provided with an anti-reflection film.

[0019] In one embodiment of the present invention, the driving device drives the diffusion sheet module to rotate at a speed of 500-15000 RPM.

[0020] In a second aspect, in order to solve the above-mentioned technical problems, an embodiment of the utility model further provides a laser light source, including the speckle-eliminating laser-coupled fiber system described in any one of the above-mentioned embodiments.

[0021] The above technical solution of the utility model has at least the following advantages compared with the prior art:

[0022] The laser coupling fiber system and laser light source for eliminating speckle described in the utility model include an incident fiber, a collimating lens, a converging lens, an output fiber and a diffuser module, and the diffuser module has a scattering plate assembly; the incident fiber is used to generate output light; the collimating lens is used to convert the output light into parallel light; the converging lens is used to couple the parallel light into convergent light; the convergent light is incident on the scattering plate assembly of the diffuser, and is sequentially spliced ​​to form a ring structure, and the scattering plate assembly performs a rotational motion to suppress the speckle of the convergent light; the output fiber couples and outputs the convergent light after suppressing the speckle. The laser coupling fiber system for eliminating speckle of the utility model provides a fiber coupling path for eliminating speckle, and through the rotational motion of the scattering plate, the number of random phases of the scattering plate per unit time is increased, the coherence of the convergent light is weakened, and the problems of insufficient laser speckle suppression and severe light diffusion are significantly improved; at the same time, through the cross arrangement of the scattering plates, the position of the scattering plates in the laser coupling fiber system is optimized, and the transmittance of the laser coupling fiber system is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein

[0024] Figure 1 It is a schematic structural diagram of a laser-coupled optical fiber system for eliminating speckles in a preferred embodiment of the utility model;

[0025] Figure 2 yes Figure 1 A schematic diagram of the structure of a diffuser module in a laser-coupled optical fiber system for eliminating speckles is shown;

[0026] Explanation of the reference numerals in the specification: 100, incident optical fiber; 200, output optical fiber; 300, collimating lens; 400, converging lens; 510, driving device; 511, stator; 512, mover; 520, first scattering plate assembly; 530, second scattering plate assembly. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0028] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings in the specification and specific trial methods.

[0029] Embodiment 1

[0030] Reference Figure 1As shown, a preferred embodiment of the utility model discloses a speckle-eliminating laser coupling fiber system, comprising an incident fiber 100, a collimating lens 300, a converging lens 400, a diffuser module 500 and an output fiber 200 arranged in sequence along the light transmission direction, and a speckle-eliminating laser fiber coupling path is formed through the above devices.

[0031] The present application uses an incident optical fiber 100, an output light 200, a collimating lens 300, a converging lens 400 and a diffuser module 500 to form a speckle-eliminating laser coupling optical fiber path. The first diffuser assembly 520 and the second diffuser assembly 530 in the diffuser module 500 are rotated at high speed to suppress the converging light passing through the diffuser module 500 to reduce the speckle, significantly improving the problem of insufficient laser speckle suppression, thereby improving the optical efficiency of the optical fiber coupling system, and the first diffuser assembly 520 and the second diffuser assembly 530 arranged in sequence crosswise improve the transmittance of the laser coupling optical fiber system.

[0032] The present invention discloses a laser coupling fiber system for eliminating speckles, comprising: an input fiber 100 for generating output light; a collimating lens 300 for converting the output light into parallel collimated light; a converging lens 400 for converting the collimated light into converged light; a diffuser module 500 for suppressing the speckles of the converged light; and an output fiber 200 for coupling out the converged light after the speckles are suppressed.

[0033] Specifically, the diffuser module 500 includes a driving device 510, a first diffuser assembly 520 and a second diffuser assembly 530; and the diffuser module 500 is located between the converging lens 400 and the output optical fiber 200. The convergent light emitted by the converging lens 400 is directly coupled to the output optical fiber 200 after being subjected to speckle suppression by the diffuser module 500, thereby making the structure of the laser coupling system more streamlined and improving the efficiency of laser coupling.

[0034] Furthermore, the first scattering plate assembly 520 and the second scattering plate assembly 530 respectively have a plurality of scattering plates, and these scattering plates are respectively cross-arranged in sequence and spliced ​​to form a ring structure; which is used to optimize the position of the scattering plates in the system and improve the transmittance of the optical coupling.

[0035] Furthermore, the scattering angle of the first scattering plate assembly 520 is between 0.5° and 5°, and the scattering angle of each scattering plate is the same; the scattering angle of the second scattering plate assembly 530 is between 0.5° and 5°, and the scattering angle of each scattering plate is the same; and the first scattering plate assembly 520 and the second scattering plate assembly 530 cannot be set to the same angle. Scattering plates with different angles improve the effect of eliminating speckles and solve the problem of insufficient speckle suppression.

[0036] Specifically, the driving device 510 includes a stator 511 and a mover 512; the stator 511 is used to fix the first scattering plate assembly 520 and the second scattering plate assembly 530; the mover 512 is connected to the stator 511, and the mover 512 rotates counterclockwise or clockwise, and the speed is controlled at 500-15000RPM; the first scattering plate assembly 520 and the second scattering plate assembly 530 are fixed to the mover 512 and rotate therewith; the first scattering plate assembly 520 and the second scattering plate assembly 530 are driven by the mover 512 to perform high-speed rotational motion, thereby increasing the number of random phases of the first scattering plate assembly 520 and the second scattering plate assembly 530 per unit time, weakening the coherence of the light beam, preventing the diffusion of the converged light, and significantly improving the despeckle effect.

[0037] Furthermore, the first scattering plate assembly 520 and the second scattering plate assembly 530 are made of quartz, crown, flint glass or plastic material, which has high light transmittance to the incident optical fiber; and the first scattering plate assembly 520 and the second scattering plate assembly 530 can be optionally coated with an anti-reflection film on both sides.

[0038] Specifically, when the speckle-eliminating laser coupling fiber system of the utility model couples laser, the specific process is as follows: the laser is introduced by the incident optical fiber 100 and converted into output light, the collimating lens 300 converts the output light into a beam of parallel light and projects it to the converging lens 400, the converging lens 400 couples the collimated light and outputs it as convergent light, and then the convergent light passes through the diffuser module 500, and the first diffuser assembly 520 and the second diffuser assembly 530 arranged in sequence in a cross-arranged manner in the diffuser module 500 rotate at a high speed to suppress the speckle of the convergent light; finally, the output optical fiber 200 couples and outputs the convergent light after suppressing the speckle.

[0039] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0040] The laser coupling fiber system and laser light source for eliminating speckle described in the utility model include an incident fiber 100, a collimating lens 300, a converging lens 400, an output fiber 200 and a diffuser module 500, and the diffuser module 500 has a driving device 510, a first diffuser assembly 520, and a second diffuser assembly 530; the incident fiber 100 is used to generate output light; the collimating lens 300 is used to convert the output light into parallel light; the converging lens 400 is used to couple and convert the parallel light into convergent light; the convergent light is incident on the first diffuser assembly 520 and the second diffuser assembly 530 of the diffuser module 500, the first diffuser assembly 520 and the second diffuser assembly 530 have different scattering angles, are spliced ​​in sequence to form an annular structure and perform high-speed rotation motion to suppress the speckle of the convergent light; the output fiber 200 couples and outputs the convergent light after the speckle is suppressed. The speckle-eliminating laser-coupled optical fiber system of the utility model provides a speckle-eliminating optical fiber coupling path. Through the high-speed rotation of the first scattering plate assembly 520 and the second scattering plate assembly 530, the number of random phases of the scattering plates is increased, the coherence of the converged light is weakened, and the problems of insufficient laser speckle suppression and severe light diffusion are significantly improved. At the same time, through the cross-arrangement of the scattering plates, the position of the scattering plates in the laser-coupled optical fiber system is optimized, and the transmittance of the laser-coupled optical fiber system is improved.

[0041] Embodiment 2

[0042] The preferred embodiment of the utility model further discloses a laser light source, and its specific implementation is the laser-coupled optical fiber system for eliminating speckles as described in the first embodiment.

[0043] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A laser-coupled optical fiber system for eliminating speckles, characterized in that: include: An input optical fiber for generating output light; A collimating lens, disposed on the optical path of the output light, for converting the output light into parallel light; A converging lens, used for converting the parallel light into converging light; A diffuser module, comprising a diffuser assembly, the converged light is incident on the diffuser assembly, and the diffuser assembly suppresses the speckle of the converged light by rotating; wherein the diffuser assembly comprises a plurality of diffusers, and the plurality of diffusers are sequentially spliced ​​to form a ring structure; The output optical fiber is used to output the converged light after the speckle is suppressed.

2. The laser-coupled optical fiber system for eliminating speckles according to claim 1, characterized in that: The diffusion sheet module comprises two groups of diffusion sheet components, namely a first diffusion sheet component and a second diffusion sheet component. The two groups of diffusion sheet components are arranged in sequence and spliced ​​to form a ring structure.

3. The laser-coupled optical fiber system for eliminating speckles according to claim 2, characterized in that: The first diffuser assembly includes a plurality of first diffusers, the second diffuser assembly includes a plurality of second diffusers, the first diffusers and the second diffusers included in the diffuser module are alternately arranged and spliced ​​to form the annular structure, wherein the scattering angles of the first diffusers and the second diffusers are different.

4. The laser-coupled optical fiber system for eliminating speckles according to claim 3, characterized in that: The scattering angle of the first scattering sheet is 0.5°-5°.

5. The speckle-eliminating laser-coupled optical fiber system according to claim 3 or 4, characterized in that: The scattering angle of the second scattering sheet is 0.5°-5°.

6. The laser-coupled optical fiber system for eliminating speckles according to claim 3, characterized in that: The first scattering plate and the second scattering plate are made of quartz, crown glass, flint glass or plastic.

7. The speckle-eliminating laser-coupled optical fiber system according to claim 3 or 6, characterized in that: The scattering surface of the first scattering sheet and / or the second scattering sheet is provided with an anti-reflection film.

8. The laser-coupled optical fiber system for eliminating speckles according to claim 1, characterized in that: Also includes: The driving device is used for driving the diffusion sheet module to rotate, and comprises a mover and a stator, and the diffusion sheet module is connected to the stator.

9. The laser-coupled optical fiber system for eliminating speckles according to claim 8, characterized in that: The driving device drives the diffusion sheet module to rotate at a speed of 500-15000 RPM.

10. A laser light source, characterized in that: A laser-coupled optical fiber system comprising the speckle-eliminating method according to any one of claims 1 to 9.

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