CN213905815U - Laser with device protection system - Google Patents
Laser with device protection system Download PDFInfo
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- CN213905815U CN213905815U CN202022730054.7U CN202022730054U CN213905815U CN 213905815 U CN213905815 U CN 213905815U CN 202022730054 U CN202022730054 U CN 202022730054U CN 213905815 U CN213905815 U CN 213905815U
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Abstract
The utility model discloses a laser instrument with device protection system belongs to laser machine device protection technical field, for solving the poor problem design of current oil smoke filter equipment to oil smoke cooling effect. The utility model discloses a: the device protection system is connected to the rear portion of the laser, and the laser comprises a pump source, a forward beam combiner, a resonant cavity, a reverse beam combiner and a mode stripper; the device protection system is internally provided with a spectrometer, a first judgment setting unit, a second judgment setting unit and an output head. The utility model discloses can reach the purpose of protection laser machine device under the condition that does not influence laser output power, light beam quality and biography ability fiber length.
Description
Technical Field
The utility model relates to a laser machine device protection technical field especially relates to a laser instrument with device protection system.
Background
Along with the improvement of the power of an optical fiber coupling high-power semiconductor pump source and the improvement of the manufacturing level of an optical fiber passive device, the output power of the optical fiber laser is increased, but the increase of the output power causes the nonlinear effect of the optical fiber laser to be increased sharply, wherein the Stimulated Raman Scattering (SRS) effect is the most prominent.
The SRS effect is a third-order nonlinear effect in which incident laser interacts with medium molecules to generate scattered light having a frequency different from that of the incident laser, and the intensity of the SRS effect increases as the power density of laser signal light increases and the length of a gain/energy-transfer optical fiber increases. The first method is to use a large-fiber-core gain/energy transmission fiber to improve the SRS threshold in a mode of reducing the signal light power density, but the large fiber core can seriously affect the beam quality of the fiber laser and obviously reduce the threshold of other nonlinear effects such as mode instability effect and the like; secondly, the pump with high absorption rate wavelength or the shorter energy transmission fiber is used, so that the improvement of the SRS strength is inhibited in a mode of shortening the length of the gain/energy transmission fiber, but the pump source with high absorption rate wavelength is expensive, the absorption peak of the gain fiber corresponding to the high absorption rate wavelength is narrow, the output laser power is easy to be unstable by using the pump source with high absorption rate wavelength, and the industrial application is difficult if the shorter energy transmission fiber is used; and thirdly, inserting an inclined grating into the optical fiber laser, leading SRS laser power into a cladding from a fiber core, and then filtering the SRS laser power through a mode stripper, wherein the SRS laser power comes from signal laser power, and the method has an upper limit of the power output of the whole machine and is easy to cause thermal damage of the mode stripper. There is a need for a cost-effective and reliable solution that does not affect laser output power, beam quality and energy delivery fiber length.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a laser with device protection system, which aims to solve the technical problem of the prior art that the laser device cannot be protected without affecting the laser output power, the beam quality and the energy transmission optical fiber length.
In order to achieve the above object, the utility model provides a laser instrument with device protection system:
the device protection system comprises a laser, wherein the rear part of the laser is connected with a device protection system, and the laser comprises a pump source 1, a forward beam combiner 2, a resonant cavity 3, a reverse beam combiner 4 and a mode stripper 5; a spectrometer 19, a first judgment setting unit 16, a second judgment setting unit 17 and an output head 9 are arranged in the device protection system;
the spectrometer 19 is configured to monitor a first difference M between first-order stimulated raman scattering SRS laser and signal laser, and a second difference W between n-1-order laser and n-order SRS laser, where n is a positive integer greater than or equal to 2, and the first-order stimulated raman scattering SRS laser is first-order SRS laser;
the first judgment setting unit 16 is configured to judge whether the first difference M is less than or equal to 30 dB; when the first difference M is less than or equal to 30dB, only a first-level high-reflection grating 6 is arranged in the device protection system; when the first difference M is larger than 30dB, the device protection system is not provided with a first-level high-reflection grating 6;
the second judgment setting unit 17 is configured to judge whether a second difference W between the n-1 order SRS laser and the n order SRS laser is less than or equal to 30dB when the first difference M is less than or equal to 30 dB; when a second difference value W between the n-order SRS laser and the n-1-order SRS laser is less than or equal to 30dB, a high-reflection grating set Q covering m extra-cavity high-reflection gratings is arranged in the device protection system, wherein m is a positive integer greater than or equal to 1, and the extra-cavity high-reflection gratings sequentially include a first-order high-reflection grating 6, a second-order high-reflection grating 7, a third-order high-reflection grating 8 … … n-1 level high-reflection grating and an n-order high-reflection grating.
Optionally, an intracavity high-reflection grating 10 and an intracavity low-reflection grating 11 are arranged in the resonant cavity 3, a gain grating 12 is arranged between the intracavity high-reflection grating 10 and the intracavity low-reflection grating 11, a first energy transmission optical fiber 13 is arranged between the first-stage high-reflection grating 6 and the second-stage high-reflection grating 7, the second-stage high-reflection grating 7 and the third-stage high-reflection grating 8 are provided with a second energy transmission optical fiber 14, and the third-stage high-reflection grating 8 and the output head 9 are provided with a third energy transmission optical fiber 15.
Optionally, the output end of the first-level high-reflection grating 6 is welded to one end of the first energy transmission fiber 13, the other end of the first energy transmission fiber 13 is welded to the input end of the second-level high-reflection grating 7, the output end of the third-level high-reflection grating 8 is welded to one end of the third energy transmission fiber 15, and the other end of the third energy transmission fiber 15 is welded to the input end of the output head 9.
Optionally, the number of the stripper 5 is one or more.
Optionally, the number of the laser and the device protection system is one, or the number of the laser and the device protection system is at least two.
Optionally, when the number of the lasers is at least two, all output optical fibers at the rear of the reverse beam combiner 4 of the lasers are welded to the same combining beam combiner 18.
Optionally, the combiner 18 is located before the stripper 5.
Optionally, the laser reflectivity of each level of high-reflectivity grating in the high-reflectivity grating set Q to the working waveband thereof is greater than or equal to 99.5%.
Optionally, the optical fibers from the forward combiner 2 to the output head 9 are the same in size.
Optionally, the laser includes fiber lasers with different powers, different wavelengths, different fibers, and different structures.
The utility model has the advantages that: the rear part of the laser is connected with a device protection system, the device protection system comprises a high reflecting grating set, and the high reflecting grating outside the cavity in the high reflecting grating set Q can reflect SRS laser transmitted along the reverse direction of the optical path of the laser into forward transmission, so that the protection of the front-end device of the laser and the maintenance of the forward transmission laser power are realized, and long energy transmission optical fibers can be used for laser transmission.
Drawings
Fig. 1 is a schematic view of an embodiment of the present invention;
fig. 2 is a schematic view of another embodiment of the present invention;
in the attached drawing, 1 is a pump source, 2 is a forward beam combiner, 3 is a resonant cavity, 4 is a reverse beam combiner, 5 is a mode stripper, 6 is a first-level high-reflection grating, 7 is a second-level high-reflection grating, 8 is a third-level high-reflection grating, 9 is an output head, 10 is an intracavity high-reflection grating, 11 is an intracavity low-reflection grating, 12 is a gain grating, 13 is a first energy transmission fiber, 14 is a second energy transmission fiber, 15 is a third energy transmission fiber, 16 is a first judgment setting unit, 17 is a second judgment setting unit, 18 is a summary beam combiner, and 19 is a spectrometer.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention. In the description of the present invention, it is to be understood that the terms "inside", "upper", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. In the description of the present invention, unless expressly stated or limited otherwise, the term "connected" is to be understood in a broad sense, e.g. fixedly connected, detachably connected, or integral; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present invention will be further explained with reference to the accompanying drawings:
referring to fig. 1, in an embodiment of the present invention, the present invention includes a laser, an output end of the laser is connected to a device protection system, and the laser includes a pump source 1, a forward beam combiner 2, a resonant cavity 3, a reverse beam combiner 4, and a mode stripper 5;
a spectrometer 19, a first judgment setting unit 16, a second judgment setting unit 17 and an output head 9 are arranged in the device protection system;
the spectrometer 19 is configured to monitor a first difference M between first-order stimulated raman scattering SRS laser and signal laser, and a second difference W between n-1-order laser and n-order SRS laser, where n is a positive integer greater than or equal to 2, and the first-order stimulated raman scattering SRS laser is first-order SRS laser;
the first judgment setting unit 16 is configured to judge whether the first difference M is less than or equal to 30 dB; when the first difference M is less than or equal to 30dB, only a first-level high-reflection grating 6 is arranged in the device protection system; when the first difference M is larger than 30dB, the device protection system is not provided with a first-level high-reflection grating 6;
the second determination setting unit 17 is configured to determine whether a second difference W between the n-1 order SRS laser and the n-order SRS laser is less than or equal to 30dB when the first difference M is less than or equal to 30 dB; when a second difference value W between the n-order SRS laser and the n-1-order SRS laser is less than or equal to 30dB, a high-reflection grating set Q covering m extra-cavity high-reflection gratings is arranged in the device protection system, wherein m is a positive integer greater than or equal to 1, and the extra-cavity high-reflection gratings sequentially include a first-order high-reflection grating 6, a second-order high-reflection grating 7, a third-order high-reflection grating 8 … … n-1 level high-reflection grating and an n-order high-reflection grating.
In the embodiment, as the power of the optical fiber coupling high-power semiconductor pump source is increased and the manufacturing level of the optical fiber passive device is increased, the output power of the optical fiber laser is increased, but the increase of the output power causes the nonlinear effect of the optical fiber laser to be increased sharply, wherein the Stimulated Raman Scattering (SRS) effect is the most prominent. The SRS effect is a third-order nonlinear effect that incident laser interacts with medium molecules to generate scattered light with different incident laser frequencies, and the SRS laser intensity is improved along with the increase of the power density of signal light of the fiber laser and the increase of the length of a gain/energy-transfer fiber.
The setting of the multi-stage high-reflection grating is conditional and related to the parameters and the length of the energy transmission optical fiber, namely, when the difference value between first-order SRS laser and signal laser is within 30dB, the first-stage high-reflection grating 6 is set; when the difference value between the second-order SRS laser and the first-order SRS laser is within 30dB, the second-order high-reflection grating 7 is arranged, and by analogy, the center wavelengths of all the levels of high-reflection gratings are different, the first-order high-reflection grating 6 only can act on the first-order SRS laser, and the second-order high-reflection grating 7 only can act on the second-order SRS laser.
An intracavity high-reflection grating 10 and an intracavity low-reflection grating 11 are arranged in the resonant cavity 3, a gain grating 12 is arranged between the intracavity high-reflection grating 10 and the intracavity low-reflection grating 11, a first energy transmission optical fiber 13 is arranged between the first-stage high-reflection grating 6 and the second-stage high-reflection grating 7, the second-stage high-reflection grating 7 and the third-stage high-reflection grating 8 are provided with a second energy transmission optical fiber 14, and the third-stage high-reflection grating 8 and the output head 9 are provided with a third energy transmission optical fiber 15.
In this embodiment, the pump sources 1 are electro-optical conversion devices, and convert electrical energy into semiconductor pump laser light, and the number of the pump sources 1 is at least two; the forward beam combiner combines the pump laser converted by the pump source 1 into one beam, and the pump laser is injected into the resonant cavity 3 in a forward direction; the intracavity high-reflection grating 10 is used for changing the transmission direction of signal laser and screening the gain wavelength together with the intracavity low-reflection grating 11; the gain fiber 12 is used for converting the pump laser into signal laser; the reverse beam combiner 4 combines a plurality of pump lasers into one beam and reversely injects the pump laser into the resonant cavity 3; the stripper 5 is used to strip off unnecessary cladding light in the laser light output from the laser.
The output end of the first-level high-reflection grating 6 is welded with one end of the first energy transmission optical fiber 13, the other end of the first energy transmission optical fiber 13 is welded with the input end of the second-level high-reflection grating 7, the output end of the third-level high-reflection grating 8 is welded with one end of the third energy transmission optical fiber 15, and the other end of the third energy transmission optical fiber 15 is welded with the input end of the output head 9.
The number of the stripper 5 is one or more.
In the present embodiment, one or more of the stripper 5 may be used in a matching manner according to parameters such as the power of the laser for stripping the cladding layer and the stripping depth of the stripper 5 itself, and the stripper 5 is connected in series.
Referring to fig. 2, in another embodiment of the present invention, the number of the lasers and the device protection system is one, or the number of the lasers and the device protection system is at least two, when the number of the lasers is at least two, all the output fibers at the rear of the reverse beam combiner 4 of the number of the lasers are welded to the same combining beam device 18, and the combining beam device 18 is located before the mold stripping device 5.
In the present embodiment, one or more of the stripper 5 may be used in a matching manner according to parameters such as the power of the laser for stripping the cladding layer and the stripping depth of the stripper 5 itself, and the stripper 5 is connected in series. Multiple lasers may be switched in simultaneously.
The laser reflectivity of each level of high-reflection grating in the high-reflection grating set to the working waveband is more than or equal to 99.5%.
In this embodiment, the reflectivity of the multi-stage high-reflection grating to the laser in the working band is greater than or equal to 99.5%, which can ensure that most of the SRS laser transmitted along the optical path in the reverse direction is reflected as forward transmission.
The optical fibers from the forward beam combiner 2 to the output head 9 are the same in size.
The optical fibers between the forward beam combiner 2 and the output head 9 have the same size, so that the phenomena of signal light leakage, light beam quality degradation and the like caused by mismatching of different optical fibers can be prevented.
The laser comprises optical fiber lasers with different powers, different wavelengths, different optical fibers and different structures.
The technical principle of the present invention is described above with reference to the specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.
Claims (10)
1. The laser with the device protection system is characterized by comprising a laser, wherein the output end of the laser is connected with the device protection system, and the laser comprises a pump source (1), a forward beam combiner (2), a resonant cavity (3), a reverse beam combiner (4) and a mode stripper (5);
a spectrometer (19), a first judgment setting unit (16), a second judgment setting unit (17) and an output head (9) are arranged in the device protection system;
the spectrometer (19) is used for monitoring a first difference M between first-order Stimulated Raman Scattering (SRS) laser and signal laser and a second difference W between n-1-order laser and n-order SRS laser, wherein n is a positive integer greater than or equal to 2, and the first-order Stimulated Raman Scattering (SRS) laser is first-order SRS laser;
the first judgment setting unit (16) is used for judging whether the first difference value M is less than or equal to 30 dB; when the first difference M is less than or equal to 30dB, only a first-level high-reflection grating (6) is arranged in the device protection system; when the first difference M is larger than 30dB, a first-level high-reflection grating (6) is not arranged in the device protection system;
the second judgment setting unit (17) is used for judging whether a second difference W between the n-1 order SRS laser and the n order SRS laser is less than or equal to 30dB when the first difference M is less than or equal to 30 dB; when a second difference value W between the n-order SRS laser and the n-1-order SRS laser is smaller than or equal to 30dB, a high-reflection grating set Q covering m extra-cavity high-reflection gratings is arranged in the device protection system, wherein m is a positive integer larger than or equal to 1, and the extra-cavity high-reflection gratings sequentially comprise a first-level high-reflection grating (6), a second-level high-reflection grating (7), a third-level high-reflection grating (8) … … n-1 level high-reflection grating and an n-level high-reflection grating.
2. The laser with device protection system according to claim 1, wherein an intracavity high-reflection grating (10) and an intracavity low-reflection grating (11) are arranged in the resonant cavity (3), a gain grating (12) is arranged between the intracavity high-reflection grating (10) and the intracavity low-reflection grating (11), a first energy transmission fiber (13) is arranged between the first-stage high-reflection grating (6) and the second-stage high-reflection grating (7), a second energy transmission fiber (14) is arranged between the second-stage high-reflection grating (7) and the third-stage high-reflection grating (8), and a third energy transmission fiber (15) is arranged between the third-stage high-reflection grating (8) and the output head (9).
3. The laser with device protection system of claim 2, wherein the output end of the first-stage high-reflection grating (6) is fused with one end of the first energy-transmitting fiber (13), the other end of the first energy-transmitting fiber (13) is fused with the input end of the second-stage high-reflection grating (7), the output end of the third-stage high-reflection grating (8) is fused with one end of the third energy-transmitting fiber (15), and the other end of the third energy-transmitting fiber (15) is fused with the input end of the output head (9).
4. The laser with device protection system according to claim 1, wherein the number of the stripper (5) is one or more.
5. The laser with device protection system of claim 1, wherein the number of the laser and the device protection system is one or at least two.
6. The laser with device protection system according to claim 5, characterized in that when the number of said lasers is at least two, all output fibers at the output ends of the reverse beam combiner (4) of said number of lasers are fused to the same combined beam combiner (18).
7. The laser with device protection system as claimed in claim 6, wherein said collective beam combiner (18) is located before said stripper (5).
8. The laser with device protection system as claimed in claim 1, wherein the laser reflectivity of each high-reflectivity grating in the high-reflectivity grating set Q to its working band is greater than or equal to 99.5%.
9. The laser with device protection system as claimed in claim 1, wherein the optical fibers between said forward combiner (2) and said output head (9) are of the same size.
10. The laser with device protection system of claim 1, wherein said laser comprises a fiber laser of different power, different wavelength, different fiber, different configuration.
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| CN202022730054.7U CN213905815U (en) | 2020-11-23 | 2020-11-23 | Laser with device protection system |
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| CN202022730054.7U CN213905815U (en) | 2020-11-23 | 2020-11-23 | Laser with device protection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113504032A (en) * | 2021-09-06 | 2021-10-15 | 深圳市创鑫激光股份有限公司 | Fiber grating test system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113504032A (en) * | 2021-09-06 | 2021-10-15 | 深圳市创鑫激光股份有限公司 | Fiber grating test system and method |
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