CN219677763U - Bidirectional output different-wavelength optical fiber oscillator - Google Patents
Bidirectional output different-wavelength optical fiber oscillator Download PDFInfo
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- CN219677763U CN219677763U CN202321361233.5U CN202321361233U CN219677763U CN 219677763 U CN219677763 U CN 219677763U CN 202321361233 U CN202321361233 U CN 202321361233U CN 219677763 U CN219677763 U CN 219677763U
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 104
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 10
- 239000000835 fiber Substances 0.000 claims abstract description 126
- 230000003287 optical effect Effects 0.000 claims abstract description 57
- 238000010521 absorption reaction Methods 0.000 claims abstract description 40
- 238000005253 cladding Methods 0.000 claims description 32
- 238000005086 pumping Methods 0.000 claims description 8
- 238000002310 reflectometry Methods 0.000 claims description 6
- 238000001069 Raman spectroscopy Methods 0.000 abstract description 16
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Abstract
The utility model relates to the technical field of lasers, in particular to a bidirectional output different-wavelength optical fiber oscillator, which comprises a first output component, a first optical fiber combiner, a first optical resonant cavity, a second optical fiber combiner and a second output component which are sequentially connected through optical fibers, wherein the first optical resonant cavity and the second optical resonant cavity are partially overlapped and are provided with at least one shared gain optical fiber, the non-overlapped part of the first optical resonant cavity and the second optical resonant cavity is respectively provided with a first series of gain optical fibers and a second series of gain optical fibers, and the absorption coefficients of the first series of gain optical fibers and the second series of gain optical fibers are smaller than those of the shared gain optical fibers. The beneficial effects are that: the first optical resonant cavity and the second optical resonant cavity share the shared gain fiber, the length of the total gain fiber is greatly reduced, the Raman threshold of the laser system is improved, the influence of the Raman effect on the laser is reduced, and the laser system can realize higher laser output power.
Description
Technical Field
The utility model relates to the technical field of lasers, in particular to a bidirectional output different-wavelength optical fiber oscillator.
Background
In recent years, with the progress and development of optical fibers and optical fiber devices, optical fiber lasers have been greatly developed, and have been widely used in industrial applications such as laser cutting and welding. However, conventional fiber lasers are generally capable of outputting only one end, and cannot meet the application requirements of dual-end laser output in industrial production. Although two separate lasers can achieve two-end output, the cost of the lasers and the matched equipment is quite expensive, and the volume is too huge. Thus, it is greatly advantageous to implement two-terminal lasers under one optical path system. Secondly, the factors limiting the optical fiber oscillator to obtain higher power are mainly the constraints of the optical fiber thermal load and raman effect besides the existing technical problems. Two common solutions for reducing the influence of the raman effect are provided, one is to increase the diameter of the gain fiber, but the increase of the fiber core diameter also leads to the substantial increase of the laser mode transmitted in the fiber, which causes the deterioration of the beam quality of the output laser; the second method is to reduce the length of the gain fiber, however, in order to pursue high power, it is necessary to use a gain fiber with high absorption, and a gain fiber with a high absorption coefficient has serious thermal load problem under strong pump light. Therefore, how to reduce the thermal load of the gain fiber while raising the raman threshold has been a pain point in the fiber laser industry, and for this reason, the present utility model has been made to effectively solve this problem.
Disclosure of Invention
In order to overcome the technical defects in the prior art, the utility model provides the bidirectional output different-wavelength optical fiber oscillator, which greatly reduces the thermal load of a gain optical fiber and improves the Raman threshold of a laser.
The technical scheme adopted by the utility model is as follows: the utility model provides a two-way output different wavelength fiber oscillator, includes first output subassembly, first optic fibre beam combiner, first optical resonator, second optic fibre beam combiner and the second output subassembly that connect gradually through optic fibre, first optical resonator and second optical resonator part overlap the setting and overlap the department and be equipped with at least one shared gain fiber, first optical resonator and second optical resonator's non-overlap department is equipped with first series gain fiber and second series gain fiber respectively, the absorption coefficient of first series gain fiber and second series gain fiber is less than shared gain fiber's absorption coefficient, first optic fibre beam combiner is connected with first pumping source through pumping fiber, second optic fibre beam combiner is connected with the second pumping source through pumping fiber.
Further, the first series of gain fibers comprises more than two sections of gain fibers with different absorption coefficients, and the absorption coefficient of the first series of gain fibers which are closer to the first optical fiber combiner is smaller.
Further, the second series of gain fibers comprises more than two sections of gain fibers with different absorption coefficients, and the absorption coefficient of the second series of gain fibers which are closer to the second optical fiber combiner is smaller.
Further, the first optical resonant cavity comprises a first low reflection grating, a first series of gain optical fibers, a shared gain optical fiber and a first high reflection grating which are sequentially connected through optical fibers, the second optical resonant cavity comprises a second low reflection grating, a second series of gain optical fibers, a shared gain optical fiber and a second high reflection grating which are sequentially connected through optical fibers, the first low reflection grating is connected with a first optical fiber beam combiner, the second low reflection grating is connected with a second optical fiber beam combiner, the second high reflection grating is located in the first optical resonant cavity, the first high reflection grating is located in the second optical resonant cavity, and the shared gain optical fiber is located between the first high reflection grating and the second high reflection grating.
Further, the laser wavelengths generated by the first optical resonant cavity and the second optical resonant cavity are different.
Further, the reflectivity of the first low reflection grating and the second low reflection grating is between 5% and 50%; the reflectivity of the first high reflection grating and the second high reflection grating is between 50% and 99%.
Further, the first output component comprises a first optical fiber end cap and a first cladding light filter, one end of the first cladding light filter is connected with the first optical fiber combiner, and the other end of the first cladding light filter is connected with the first optical fiber end cap.
Further, the second output component comprises a second optical fiber end cap and a second cladding light filter, one end of the second cladding light filter is connected with the second optical fiber combiner, and the other end of the second cladding light filter is connected with the second optical fiber end cap.
Further, the output wavelength of the first pump source and/or the second pump source is between 900nm and 1000 nm.
Further, the center wavelength of the first low reflection grating, the first high reflection grating, the second low reflection grating and the second high reflection grating is between 1000nm and 1100 nm.
The beneficial effects of the utility model are as follows: 1. one system realizes two paths of laser output, and the application scene is wider; 2. by adopting the double resonant cavity structure, residual pump light in one resonant cavity can enter the other resonant cavity, and compared with the single resonant cavity structure, the laser has higher light conversion rate and lower cost, and is beneficial to miniaturization of the multimode beam combining laser; 3. the first optical resonant cavity and the second optical resonant cavity share the shared gain fiber, so that the length of the total gain fiber of the laser system is greatly reduced, the Raman threshold of the laser system is greatly improved, the influence of the Raman effect on the laser is reduced, and the laser system can realize higher laser output power; 4. the gain optical fibers with different absorption coefficients are arranged in the resonant cavity, so that the thermal load of the gain optical fibers is greatly reduced, the stability of the laser is improved, the Raman threshold of the laser system is improved, and the influence of the Raman effect on the laser is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a bidirectional output different-wavelength optical fiber oscillator according to embodiment 1.
Fig. 2 is a schematic structural diagram of a bidirectional output different wavelength fiber oscillator according to embodiment 2.
Reference numerals illustrate:
11. a first fiber end cap; 12. a second fiber end cap; 21. a first cladding light filter; 22. a second cladding light filter; 31. a first optical fiber combiner; 32. a second optical fiber combiner; 4. a first optical resonant cavity; 41. a first series of gain fibers; 42. a first low reflection grating; 43. a first high reflection grating; 5. a second optical resonant cavity; 51. a second series of gain fibers; 52. a second low reflection grating; 53. a second high reflection grating; 6. sharing the gain fiber; 71. a first pump source; 72. a second pump source.
Description of the embodiments
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.
The utility model is further described below with reference to the accompanying drawings:
examples
As shown in fig. 1, the present embodiment provides a bidirectional output different wavelength optical fiber oscillator, which includes a first output component, a first optical fiber combiner 31, a first optical resonant cavity 4, a second optical resonant cavity 5, a second optical fiber combiner 32 and a second output component that are sequentially connected through optical fibers, where the first optical fiber combiner 31 is connected with a first pump source 71 through a pump optical fiber, and the second optical fiber combiner 32 is connected with a second pump source 72 through a pump optical fiber.
In this embodiment, the output wavelength of the first pump source 71 and/or the second pump source 72 is between 900nm and 1000nm, specifically, the number of the first pump source 71 and the second pump source 72 is at least one, the first pump source 71 and the second pump source 72 both use semiconductor lasers, and the output wavelength of the first pump source 71 and the second pump source 72 is 915nm.
In this embodiment, the first optical resonant cavity 4 and the second optical resonant cavity 5 are partially overlapped and a section of shared gain fiber 6 is disposed at the overlapping position, in other embodiments, the shared gain fiber 6 may be set to multiple sections according to needs, when the shared gain fiber 6 is set to multiple sections, the absorption coefficients of the multiple sections of shared gain fiber 6 may be the same, and the absorption coefficients of the multiple sections of shared gain fiber 6 may also be sequentially increased from two sides to the middle.
In this embodiment, the non-overlapping parts of the first optical resonant cavity 4 and the second optical resonant cavity 5 are respectively provided with a first series of gain optical fibers 41 and a second series of gain optical fibers 51, and the absorption coefficients of the first series of gain optical fibers 41 and the second series of gain optical fibers 51 are smaller than the absorption coefficient of the shared gain optical fiber 6; specifically, the first optical resonant cavity 4 includes a first low reflection grating 42, a first series of gain fibers 41, a shared gain fiber 6 and a first high reflection grating 43 that are sequentially connected by optical fibers, the second optical resonant cavity 5 includes a second low reflection grating 52, a second series of gain fibers 51, a shared gain fiber 6 and a second high reflection grating 53 that are sequentially connected by optical fibers, the first low reflection grating 42 is connected with the first optical fiber combiner 31, the second low reflection grating 52 is connected with the second optical fiber combiner 32, the second high reflection grating 53 is located in the first optical resonant cavity 4, the first high reflection grating 43 is located in the second optical resonant cavity 5, and the shared gain fiber 6 is located between the first high reflection grating 43 and the second high reflection grating 53.
In the present embodiment, the absorption coefficients of the first series of gain fibers 41, the second series of gain fibers 51, and the shared gain fiber 6 are between 0.1dB/m and 10 dB/m.
When the design of the fiber laser needs the absorption of the gain fiber to the pump light to reach 20dB and the absorption coefficient of the gain fiber is 0.5dB/m, the length of the gain fiber is 40m; with the solution of the present embodiment, in the case where the first optical resonator 4 and the second optical resonator 5 are used simultaneously:
if the first series of gain fibers 41 and the second series of gain fibers 51 are both gain fibers with the length of 4m and the absorption coefficient of 0.25dB/m, the absorption coefficient of the shared gain fiber 6 is 1.2dB/m, the length of the used gain fibers is 15m, the total length of the gain fibers required by the two resonant cavities is 23m, and at the moment, the total gain fiber length can be shortened by 17m, thereby not only reducing the cost and the thermal load of the gain fibers, but also greatly improving the raman threshold value of the laser system, reducing the influence of the raman effect on the laser, and enabling the fiber laser to realize higher power output.
In this embodiment, the fiber cores of the first low reflection grating 42, the first high reflection grating 43, the second low reflection grating 52 and the second high reflection grating 53 have diameters of 10um-100um, the inner cladding has diameters of 100um-1000um, the outer cladding has diameters of 250um-3000um, specifically, the fiber cores of the four reflection gratings in this embodiment have diameters of 20um, the inner cladding has diameters of 400um, and in other embodiments, the center wavelength, the fiber core diameter, the inner cladding diameter and the outer cladding diameter of the four reflection gratings may be selected as required.
In this embodiment, the laser wavelengths generated by the first optical resonant cavity 4 and the second optical resonant cavity 5 are different, the central wavelengths of the first low reflection grating 42, the first high reflection grating 43, the second low reflection grating 52 and the second high reflection grating 53 are between 1000nm and 1100nm, the central wavelengths of the first low reflection grating 42 and the first high reflection grating 43 are consistent, the central wavelengths of the second low reflection grating 52 and the second high reflection grating 53 are consistent, and the "consistent" refers to that the difference between the central wavelengths of the two is not more than ±2nm; specifically, the central wavelength of the first low reflection grating 42 and the first high reflection grating 43 is 1080nm, the central wavelength of the second low reflection grating 52 and the second high reflection grating 53 is 1010nm, and the two sets of emission gratings can control the different wavelengths of the two paths of laser so as to meet different use scenes, so that the practicability is stronger.
In this embodiment, the reflectivity of the first low reflection grating 42 and the second low reflection grating 52 is between 5% and 50%; the reflectivity of the first and second highly reflective gratings 43 and 53 is between 50% -99%.
In this embodiment, the first output component includes a first optical fiber end cap 11 and a first cladding light filter 21, one end of the first cladding light filter 21 is connected to the first optical fiber combiner 31, and the other end of the first cladding light filter 21 is connected to the first optical fiber end cap 11; the second output component comprises a second optical fiber end cap 12 and a second cladding light filter 22, one end of the second cladding light filter 22 is connected with a second optical fiber combiner 32, and the other end of the second cladding light filter 22 is connected with the second optical fiber end cap 12. The first cladding light filter 21 and the second cladding light filter 22 can filter the residual cladding light in the laser, and the first optical fiber end cap 11 and the second optical fiber end cap 12 can reduce the power density of the output end face and improve the reliability of the laser.
Examples
As shown in fig. 2, the present embodiment provides a bidirectional output different wavelength optical fiber oscillator, unlike in embodiment 1, the first series of gain optical fibers 41 in the present embodiment includes more than two sections of gain optical fibers with different absorption coefficients, and the absorption coefficients of the first series of gain optical fibers 41 closer to the first optical fiber combiner 31 are smaller; the second series of gain fibers 51 includes two or more sections of gain fibers having different absorption coefficients, and the absorption coefficient of the second series of gain fibers 51 is smaller as the second series of gain fibers 51 is closer to the second optical fiber combiner 32; specifically, the first series of gain fibers 41 and the second series of gain fibers 51 in this embodiment are two sections, the first series of gain fibers 41 with small absorption coefficient are connected with the first low reflection grating 42, the second series of gain fibers 51 with small absorption coefficient are connected with the second low reflection grating 52, so that the strong pump light passes through the gain fibers with low absorption coefficient, the gain fibers with low absorption coefficient absorb less pump light on a certain length, the thermal effect generated by quantum loss is lower, the natural gain fibers are in a reasonable thermal load range, and the absorption coefficients of the first series of gain fibers 41, the second series of gain fibers 51 and the shared gain fibers 6 are between 0.1dB/m and 10 dB/m.
When the design of the fiber laser needs the absorption of the gain fiber to the pump light to reach 20dB and the absorption coefficient of the gain fiber is 0.5dB/m, the length of the gain fiber is 40m; in the case of using the first optical resonant cavity 4 and the second optical resonant cavity 5 simultaneously, the dual-gain optical fiber proposed in the present embodiment is adopted:
the absorption coefficients of the two first series gain fibers 41 are respectively 0.5dB/m and 1.5dB/m, the corresponding lengths are respectively 4m and 2m, the absorption coefficients of the two second series gain fibers 51 are respectively 0.5dB/m and 1.5dB/m, the corresponding lengths are respectively 4m and 2m, the absorption coefficient of the shared gain fiber 6 is 2.5dB/m, the corresponding lengths are respectively 4m, the total gain fiber length is 16m, and compared with the total gain fiber length of the embodiment 1, the raman threshold of the laser system is further improved, and the influence of the raman effect on the laser is reduced.
Working principle: the pump light generated by the first pump source 71 enters the first series of gain fibers 41 and the shared gain fibers 6 in the first optical resonant cavity 4 through the first optical fiber combiner 31, laser is generated by oscillation, and the output laser sequentially passes through the first low reflection grating 42, the first optical fiber combiner 31 and the first cladding light filter 21 and finally is output through the first optical fiber end cap 11; the residual small amount of pump light enters the second series of gain fibers 51 of the second optical resonator 5, and the generated laser light sequentially passes through the second low reflection grating 52, the second optical fiber combiner 32, the second cladding light filter 22, and finally is output from the second optical fiber end cap 12.
Similarly, the pump light generated by the second pump source 72 enters the second series of gain fibers 51 and the shared gain fibers 6 in the second optical resonant cavity 5 through the second optical fiber combiner 32, the laser is generated by oscillation, and the output laser sequentially passes through the second low reflection grating 52, the second optical fiber combiner 32 and the second cladding light filter 22 and finally is output through the second optical fiber end cap 12; the residual small amount of pump light enters the first series of gain fibers 41 of the first optical resonant cavity 4, and the generated laser light sequentially passes through the first low reflection grating 42, the first optical fiber combiner 31, the first cladding light filter 21 and finally is output from the first optical fiber end cap 11.
In the process, the first optical resonant cavity 4 and the second optical resonant cavity 5 share the shared gain optical fiber 6, so that the total length of the gain optical fiber of the laser system can be greatly reduced, the Raman threshold of the laser system is greatly improved, and the influence of Raman effect on the laser is reduced; meanwhile, a plurality of sections of gain fibers with different absorption coefficients are used in a single optical resonant cavity, so that the thermal load of a laser system is reduced, and the stability of a laser is improved.
While the foregoing embodiments have shown and described the fundamental principles and main features of the utility model as well as the advantages thereof, it will be understood by those skilled in the art that the present utility model is not limited by the foregoing embodiments, but rather by the description of the embodiments and descriptions, various changes and modifications may be made therein without departing from the spirit and scope of the utility model as defined in the appended claims and their equivalents.
Claims (10)
1. The bidirectional output different-wavelength optical fiber oscillator is characterized by comprising a first output component, a first optical fiber beam combiner, a first optical resonant cavity, a second optical fiber beam combiner and a second output component which are sequentially connected through optical fibers, wherein the first optical resonant cavity and the second optical resonant cavity are partially overlapped and are provided with at least one shared gain optical fiber, the non-overlapped part of the first optical resonant cavity and the second optical resonant cavity is respectively provided with a first series of gain optical fibers and a second series of gain optical fibers, the absorption coefficients of the first series of gain optical fibers and the second series of gain optical fibers are smaller than the absorption coefficient of the shared gain optical fibers, the first optical fiber beam combiner is connected with a first pumping source through a pumping optical fiber, and the second optical fiber beam combiner is connected with a second pumping source through a pumping optical fiber.
2. The bi-directional output different wavelength fiber oscillator according to claim 1, wherein the first series of gain fibers comprises more than two sections of gain fibers having different absorption coefficients, the absorption coefficients of the first series of gain fibers being smaller the closer to the first fiber combiner.
3. The bi-directional output different wavelength fiber oscillator according to claim 1, wherein the second series of gain fibers comprises more than two sections of gain fibers having different absorption coefficients, and the absorption coefficients of the second series of gain fibers are smaller as they are closer to the second fiber combiner.
4. The bi-directional output different wavelength fiber oscillator according to claim 1, wherein the first optical resonant cavity comprises a first low reflection grating, a first series of gain fibers, a shared gain fiber and a first high reflection grating connected in sequence by optical fibers, the second optical resonant cavity comprises a second low reflection grating, a second series of gain fibers, a shared gain fiber and a second high reflection grating connected in sequence by optical fibers, the first low reflection grating is connected with a first optical fiber combiner, the second low reflection grating is connected with a second optical fiber combiner, the second high reflection grating is located in the first optical resonant cavity, the first high reflection grating is located in the second optical resonant cavity, and the shared gain fiber is located between the first high reflection grating and the second high reflection grating.
5. The bi-directional output different wavelength fiber oscillator of claim 1, wherein the first optical resonator and the second optical resonator produce different laser wavelengths.
6. The bi-directional output different wavelength fiber oscillator according to claim 4, wherein the reflectivity of the first low reflection grating and the second low reflection grating is between 5% and 50%; the reflectivity of the first high reflection grating and the second high reflection grating is between 50% and 99%.
7. The bi-directional output different wavelength fiber oscillator according to claim 1, wherein the first output component comprises a first fiber end cap and a first cladding light filter, one end of the first cladding light filter is connected with the first fiber combiner, and the other end of the first cladding light filter is connected with the first fiber end cap.
8. The bi-directional output different wavelength fiber oscillator according to claim 1, wherein the second output component comprises a second fiber end cap and a second cladding light filter, one end of the second cladding light filter is connected with the second fiber combiner, and the other end of the second cladding light filter is connected with the second fiber end cap.
9. The bi-directional output different wavelength fiber oscillator according to claim 1, wherein the output wavelength of the first pump source and/or the second pump source is between 900nm and 1000 nm.
10. The bi-directional output heterowavelength fiber oscillator of claim 4, wherein the first low reflection grating, the first high reflection grating, the second low reflection grating, and the second high reflection grating have a center wavelength between 1000nm and 1100 nm.
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| CN202321361233.5U CN219677763U (en) | 2023-05-31 | 2023-05-31 | Bidirectional output different-wavelength optical fiber oscillator |
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