CN211265960U - Low-repetition-frequency pulse optical fiber amplifier - Google Patents
Low-repetition-frequency pulse optical fiber amplifier Download PDFInfo
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- CN211265960U CN211265960U CN202020221438.3U CN202020221438U CN211265960U CN 211265960 U CN211265960 U CN 211265960U CN 202020221438 U CN202020221438 U CN 202020221438U CN 211265960 U CN211265960 U CN 211265960U
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Abstract
A low repetition frequency pulse optical fiber amplifier relates to the laser field. In the utility model, the optical fiber coupling semiconductor laser drives the power supply to output pulse current which is synchronous with the pulse seed laser to output pulse seed source laser; the pulse pumping laser output by the optical fiber coupling semiconductor laser, the pulse current output by the optical fiber coupling semiconductor laser driving power supply and the pulse seed source laser output by the pulse seed laser have the same repetition frequency; the pulse width of the pulse pump laser output by the fiber coupling semiconductor laser is the same as that of the pulse current output by the fiber coupling semiconductor laser driving power supply. The utility model adopts a pulse synchronous pumping mode, can amplify pulse seed source laser with any repetition frequency, and reduces energy storage in the gain fiber by changing pulse duration, thereby inhibiting self-excitation of the gain fiber and protecting a pulse fiber amplifier; meanwhile, the pulse laser energy and the pulse peak power can be adjusted, and the noise is effectively suppressed.
Description
Technical Field
The utility model relates to a laser instrument technical field, concretely relates to low repetition frequency pulse fiber amplifier.
Background
The mode of using a pulse output laser as a seed source and realizing the amplification of the laser power of the seed source through the optical fiber amplification is a common means for realizing the high-energy and high-peak power pulse output of the optical fiber laser, and the structure is called as a main oscillation power amplification structure. In general, a pumping source of the pulse fiber amplifier adopts a fiber coupled semiconductor laser, and the fiber coupled semiconductor laser works in a continuous output mode. The continuous pumping mode has the following defects that the pulse fiber amplifier of the continuous pumping mode has larger noise because the fiber coupling semiconductor laser works continuously and the pulse seed laser works in a pulse mode, so that the pulse fiber amplifier has strong amplified spontaneous radiation in the pulse gap time, and the noise ratio of the pulse fiber amplifier is larger; and secondly, the pulse optical fiber amplifier in a continuous pumping mode cannot amplify the low-repetition-frequency pulse seed source laser, because the optical fiber coupling semiconductor laser works continuously, when the pulse repetition frequency of the seed source laser is several hertz to several hundred hertz, the gain medium of the pulse optical fiber amplifier can generate self-excitation in the pulse gap time, and the pulse optical fiber amplifier is damaged.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems of big noise and easy damage of the existing pulse optical fiber amplifier, the utility model provides a low repetition frequency pulse optical fiber amplifier.
The utility model discloses a solve the technical scheme that technical problem adopted as follows:
the utility model discloses a low repetition frequency pulse fiber amplifier, include: the device comprises a pulse seed laser, a seed isolator, an optical fiber coupling semiconductor laser driving power supply, an optical fiber coupling semiconductor laser, a beam combiner, a gain optical fiber and an output isolator;
a first output tail fiber of the pulse seed laser is connected with a first input tail fiber of the seed isolator; the second output tail fiber of the seed isolator is connected with the second input tail fiber of the beam combiner; a third input tail fiber of the beam combiner is connected with a third output tail fiber of the optical fiber coupling semiconductor laser; a fourth output tail fiber of the beam combiner is connected with one end of the gain fiber; the fourth input tail fiber of the output isolator is connected with the other end of the gain fiber; the optical fiber coupling semiconductor laser driving power supply supplies power to the optical fiber coupling semiconductor laser;
the pulse current output by the optical fiber coupling semiconductor laser driving power supply is synchronous with the pulse seed source laser output by the pulse seed laser;
the pulse pump laser output by the optical fiber coupling semiconductor laser, the pulse current output by the optical fiber coupling semiconductor laser driving power supply and the pulse seed source laser output by the pulse seed laser have the same repetition frequency;
the pulse width of the pulse pump laser output by the optical fiber coupling semiconductor laser is the same as that of the pulse current output by the optical fiber coupling semiconductor laser driving power supply.
Further, the repetition frequency of the pulse seed source laser output by the pulse seed laser is greater than or equal to 1 Hz.
Furthermore, the core diameters of the first output tail fiber and the first input tail fiber are the same, and the numerical apertures of the first output tail fiber and the first input tail fiber are the same.
Furthermore, the first output pigtail and the first input pigtail are both single-clad fibers.
Furthermore, the core diameters of the second output tail fiber and the second input tail fiber are the same, and the numerical apertures of the second output tail fiber and the second input tail fiber are the same.
Furthermore, the fiber core diameters of the third input tail fiber and the third output tail fiber are the same, and the numerical apertures of the third input tail fiber and the third output tail fiber are the same.
Furthermore, the fiber core diameters of the fourth output tail fiber and the gain fiber are the same, and the numerical apertures of the fourth output tail fiber and the gain fiber are the same.
Furthermore, the fourth output pigtail and the gain fiber of the combiner are double-clad fibers.
Furthermore, the fiber core diameters of the fourth input tail fiber and the gain fiber are the same, and the numerical apertures of the fourth input tail fiber and the gain fiber are the same.
Further, the pulse current output by the fiber coupled semiconductor laser driving power supply is synchronous with the pulse seed source laser output by the pulse seed laser, that is, when the pulse of the pulse seed laser starts, the pulse of the fiber coupled semiconductor laser driving power supply ends.
The utility model has the advantages that:
the utility model provides a low repetition frequency pulse fiber amplifier adopts the pulse synchronous pumping mode of fiber coupling semiconductor laser drive power supply and pulse seed laser, can carry out the optic fibre to arbitrary repetition frequency's pulse seed source laser and enlarge. By changing the pulse duration of the driving power supply of the fiber coupled semiconductor laser, when the repetition frequency of the pulse seed source laser is lower, the pulse duration of the pulse pumping laser output by the fiber coupled semiconductor laser is reduced, so that the energy storage in the gain fiber is reduced, the self-excitation in the gain fiber is restrained, and the pulse fiber amplifier is protected from being damaged.
The utility model discloses a pulse duration through changing optical fiber coupling semiconductor laser adjusts pulse laser energy and pulse peak power after pulse optical fiber laser enlargies, can effectively restrain pulse optical fiber amplifier's the spontaneous radiation noise of enlargiing.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a low repetition frequency pulse optical fiber amplifier according to the present invention.
In the figure, 1, a pulse seed laser, 2, a seed isolator, 3, a fiber coupling semiconductor laser driving power supply, 4, a fiber coupling semiconductor laser, 5, a beam combiner, 6, a gain fiber, 7 and an output isolator.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, the present invention provides a low repetition frequency pulse fiber amplifier, which mainly comprises: the device comprises a pulse seed laser 1, a seed isolator 2, an optical fiber coupling semiconductor laser driving power supply 3, an optical fiber coupling semiconductor laser 4, a beam combiner 5, a gain optical fiber 6 and an output isolator 7.
The pulse seed laser 1, the seed isolator 2, the optical fiber coupling semiconductor laser 4, the beam combiner 5, the gain optical fiber 6 and the output isolator 7 are all devices with optical fiber pigtails.
The first output pigtail 11 of the pulse seed laser 1 is matched with the first input pigtail 21 of the seed isolator 2, namely the fiber core diameters of the first output pigtail 11 and the first input pigtail 21 are the same, the numerical apertures of the first output pigtail 11 and the first input pigtail 21 are the same, and the first output pigtail 11 and the first input pigtail 21 are welded together by using an optical fiber welding machine.
The second output pigtail 22 of the seed isolator 2 is matched with the second input pigtail 51 of the combiner 5, that is, the core diameters of the second output pigtail 22 and the second input pigtail 51 are the same, the numerical apertures of the second output pigtail 22 and the second input pigtail 51 are the same, and the second output pigtail 22 and the second input pigtail 51 are fused together by using an optical fiber fusion splicer.
The third input pigtail 52 of the beam combiner 5 is matched with the third output pigtail 41 of the fiber-coupled semiconductor laser 4, that is, the fiber core diameters of the third input pigtail 52 and the third output pigtail 41 are the same, the numerical apertures of the third input pigtail 52 and the third output pigtail 41 are the same, and the third input pigtail 52 and the third output pigtail 41 are fused together by using an optical fiber fusion splicer.
The fourth output pigtail 53 of the combiner 5 is matched with the gain fiber 6, that is, the core diameters of the fourth output pigtail 53 and the gain fiber 6 are the same, the numerical apertures of the fourth output pigtail 53 and the gain fiber 6 are the same, and the fourth output pigtail 53 and one end of the gain fiber 6 are fused together by using an optical fiber fusion splicer.
The fourth input pigtail 71 of the output isolator 7 is matched with the gain fiber 6, that is, the core diameters of the fourth input pigtail 71 and the gain fiber 6 are the same, the numerical apertures of the fourth input pigtail 71 and the gain fiber 6 are the same, and the other ends of the fourth input pigtail 71 and the gain fiber 6 are fused together by using an optical fiber fusion splicer.
The optical fiber coupling semiconductor laser driving power supply 3 is electrically connected with the optical fiber coupling semiconductor laser 4, the optical fiber coupling semiconductor laser 4 is supplied with power through the optical fiber coupling semiconductor laser driving power supply 3, and when the optical fiber coupling semiconductor laser driving power supply 3 outputs pulse current, the optical fiber coupling semiconductor laser 4 outputs pulse pump laser. The repetition frequency and the pulse width of the pulse pump laser output by the fiber coupling semiconductor laser 4 are consistent with those of the pulse current output by the fiber coupling semiconductor laser driving power supply 3, and specifically are as follows: the repetition frequency of the pulse pump laser output by the fiber-coupled semiconductor laser 4 is the same as the repetition frequency of the pulse current output by the fiber-coupled semiconductor laser driving power supply 3, and the pulse width of the pulse pump laser output by the fiber-coupled semiconductor laser 4 is the same as the pulse width of the pulse current output by the fiber-coupled semiconductor laser driving power supply 3. Therefore, by adjusting the repetition frequency and pulse width of the pulse current output from the fiber-coupled semiconductor laser driving power supply 3, the repetition frequency and pulse width of the pulse pump laser output from the fiber-coupled semiconductor laser 4 can be adjusted.
The fiber coupling semiconductor laser driving power supply 3 is electrically connected with the pulse seed laser 1. The repetition frequency of the pulse current output by the fiber coupling semiconductor laser driving power supply 3 is the same as the repetition frequency of the pulse seed source laser output by the pulse seed laser 1. The pulse current output by the fiber coupling semiconductor laser driving power supply 3 is synchronous with the pulse seed source laser output by the pulse seed laser 1, that is, when the pulse of the pulse seed laser 1 starts, the pulse of the fiber coupling semiconductor laser driving power supply 3 ends. The purpose of synchronization is to ensure that the repetition frequency of the pulse current output by the fiber coupled semiconductor laser driving power supply 3 is consistent with the repetition frequency of the pulse seed source laser output by the pulse seed laser 1, and ensure that the gain fiber 6 is pumped before the pulse seed source laser output by the pulse seed laser 1 enters the pulse fiber amplifier, so that the pulse seed source laser can be amplified.
The pulse width of the pulse current output by the fiber coupled semiconductor laser driving power supply 3 can be adjusted. The wider the pulse width of the pulse current output by the fiber coupled semiconductor laser driving power supply 3 is, the higher the energy stored in the gain fiber 6 is, and the larger the pulse laser energy amplified by the pulse fiber amplifier is, the higher the pulse peak power is; conversely, the narrower the pulse width of the pulse current output from the fiber-coupled semiconductor laser driving power supply 3, the lower the energy stored in the gain fiber 6, and the smaller the energy of the pulse laser amplified by the pulse fiber amplifier, the lower the pulse peak power. Therefore, the pulse laser energy and the pulse peak power amplified by the pulse fiber amplifier can be adjusted by adjusting the pulse width of the pulse current output by the fiber-coupled semiconductor laser driving power supply 3.
The pulse duration of the pulse current output by the fiber coupled semiconductor laser driving power supply 3 can be adjusted. The pulse laser energy and the pulse peak power amplified by the pulse optical fiber amplifier are in direct proportion to the pulse duration of the pulse current output by the optical fiber coupling semiconductor laser driving power supply 3. Therefore, the amplification factor of the pulse fiber amplifier can be adjusted by adjusting the pulse duration of the pulse current output by the fiber coupled semiconductor laser driving power supply 3, and the low repetition frequency pulse seed source laser can be amplified.
The utility model discloses a pulse synchronous pumping mode, when the pulse seed source laser's of pulse seed laser 1 output repetition frequency was very low, the pulse pumping laser of the same repetition frequency was also exported to fiber coupling semiconductor laser 4, had avoided gain optical fiber 6 to produce the auto-excitation phenomenon because of the energy storage is too high.
In the present embodiment, the repetition frequency of the pulse seed source laser output from the pulse seed laser 1 is 1Hz or higher.
In this embodiment, the first output pigtail 11 of the pulse seed laser 1 and the first input pigtail 21 of the seed isolator 2 are both single clad fibers. The core diameters of the first output pigtail 11 and the first input pigtail 21 are both 10 microns. The numerical apertures NA of the first output pigtail 11 and the first input pigtail 21 are both 0.07.
In the present embodiment, the core diameters of the second output pigtail 22 of the seed isolator 2 and the second input pigtail 51 of the combiner 5 are both 10 μm. The numerical aperture NA of the second output pigtail 22 and the second input pigtail 51 are both 0.07.
In the present embodiment, the core diameters of the third input pigtail 52 of the combiner 5 and the third output pigtail 41 of the fiber-coupled semiconductor laser 4 are both 105 μm. The numerical apertures NA of the third input pigtail 52 of the beam combiner 5 and the third output pigtail 41 of the fiber-coupled semiconductor laser 4 are both 0.22.
In the present embodiment, the fourth output pigtail 53 of the combiner 5 and the gain fiber 6 are both double-clad fibers. The fourth output pigtail 53 of the combiner 5 and the core diameter of the gain fiber 6 are both 20 microns. The numerical aperture NA of the fourth output pigtail 53 of the beam combiner 5 and the numerical aperture NA of the gain fiber 6 are both 0.06.
In the present embodiment, the core diameters of the fourth input pigtail 71 of the output isolator 7 and the gain fiber 6 are both 20 μm. The numerical aperture NA of the fourth input pigtail 71 of the output isolator 7 and the gain fiber 6 are both 0.06.
In the present embodiment, the repetition frequency of the pulse seed source laser output by the pulse seed laser 1 is set to 20kHz, and the pulse width is set to 10 ns; the repetition frequency of the pulse current output from the fiber-coupled semiconductor laser driving power source 3 was set to 20kHz, the pulse width was set to 20 microseconds, and the current was set to 10A. The repetition frequency of the pulse pump laser output by the fiber coupled semiconductor laser 4 is 20kHz and the pulse width is 10 ns. The repetition frequency of the pulse pump laser output by the optical fiber coupling semiconductor laser 4 is the same as the repetition frequency of the pulse current output by the optical fiber coupling semiconductor laser driving power supply 3, and the repetition frequency of the pulse current output by the optical fiber coupling semiconductor laser driving power supply 3 is the same as the light repetition frequency of the pulse seed source laser output by the pulse seed laser 1. Thus, the fiber coupled semiconductor laser 4 may enable a synchronous pumping of the pulsed seed laser 1. The pulse laser energy and the pulse peak power after the pulse optical fiber amplifier is amplified can be adjusted by adjusting the repetition frequency of the pulse current output by the optical fiber coupling semiconductor laser driving power supply 3.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A low repetition rate pulsed fiber amplifier, comprising: the device comprises a pulse seed laser (1), a seed isolator (2), an optical fiber coupling semiconductor laser driving power supply (3), an optical fiber coupling semiconductor laser (4), a beam combiner (5), a gain optical fiber (6) and an output isolator (7);
a first output tail fiber (11) of the pulse seed laser (1) is connected with a first input tail fiber (21) of the seed isolator (2); the second output tail fiber (22) of the seed isolator (2) is connected with the second input tail fiber (51) of the beam combiner (5); a third input tail fiber (52) of the beam combiner (5) is connected with a third output tail fiber (41) of the optical fiber coupling semiconductor laser (4); a fourth output tail fiber (53) of the beam combiner (5) is connected with one end of the gain optical fiber (6); a fourth input tail fiber (71) of the output isolator (7) is connected with the other end of the gain fiber (6); the optical fiber coupling semiconductor laser driving power supply (3) supplies power to the optical fiber coupling semiconductor laser (4);
the pulse current output by the optical fiber coupling semiconductor laser driving power supply (3) is synchronous with the pulse seed source laser output by the pulse seed laser (1);
the pulse pump laser output by the optical fiber coupling semiconductor laser (4), the pulse current output by the optical fiber coupling semiconductor laser driving power supply (3) and the repetition frequency of the pulse seed source laser output by the pulse seed laser (1) are the same;
the pulse width of the pulse pump laser output by the optical fiber coupling semiconductor laser (4) is the same as that of the pulse current output by the optical fiber coupling semiconductor laser driving power supply (3).
2. A low repetition rate pulsed fiber amplifier according to claim 1, wherein the pulsed seed laser (1) outputs pulsed seed source laser with a repetition rate of 1Hz or higher.
3. A low repetition frequency pulsed fiber amplifier according to claim 1, characterized in that the core diameters of the first output pigtail (11) and the first input pigtail (21) are the same, and the numerical apertures of the first output pigtail (11) and the first input pigtail (21) are the same.
4. A low repetition frequency pulsed fiber amplifier according to claim 1, wherein the first output pigtail (11) and the first input pigtail (21) are single clad fibers.
5. A low repetition frequency pulsed fiber amplifier according to claim 1, characterized in that the core diameters of the second output pigtail (22) and the second input pigtail (51) are the same, and the numerical apertures of the second output pigtail (22) and the second input pigtail (51) are the same.
6. A low repetition frequency pulsed fiber amplifier according to claim 1, characterized in that the third input pigtail (52) and the third output pigtail (41) have the same core diameter and the third input pigtail (52) and the third output pigtail (41) have the same numerical aperture.
7. A low repetition frequency pulsed fiber amplifier according to claim 1, characterized in that the fourth output pigtail (53) and the gain fiber (6) have the same core diameter and the fourth output pigtail (53) and the gain fiber (6) have the same numerical aperture.
8. A low repetition frequency pulsed fiber amplifier according to claim 1, characterized in that the fourth output pigtail (53) of the combiner (5) and the gain fiber (6) are double clad fibers.
9. A low repetition rate pulsed fiber amplifier according to claim 1, characterized in that the fourth input pigtail (71) and the gain fiber (6) have the same core diameter and the fourth input pigtail (71) and the gain fiber (6) have the same numerical aperture.
10. A low repetition rate pulsed fiber amplifier according to claim 1, wherein the pulse current output by the fiber coupled semiconductor laser driving power supply (3) is synchronized with the pulsed seed source laser output by the pulsed seed laser (1), i.e. when the pulse of the pulsed seed laser (1) starts, the pulse of the fiber coupled semiconductor laser driving power supply (3) ends.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112290362A (en) * | 2020-10-30 | 2021-01-29 | 山东海富光子科技股份有限公司 | High-power high-energy pulse all-fiber laser for laser cleaning |
| CN113964629A (en) * | 2021-09-29 | 2022-01-21 | 浙江振东光电科技有限公司 | Pulse fiber laser background noise suppression system and suppression method |
| CN113991401A (en) * | 2021-10-27 | 2022-01-28 | 北京热刺激光技术有限责任公司 | Fiber laser and laser beam combining system |
| CN114039264A (en) * | 2021-11-30 | 2022-02-11 | 湖北久之洋信息科技有限公司 | Pre-charging quick-start fiber laser |
| CN116154590A (en) * | 2023-02-20 | 2023-05-23 | 上海瑞柯恩激光技术有限公司 | Fiber laser and fiber laser treatment device |
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2020
- 2020-02-26 CN CN202020221438.3U patent/CN211265960U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112290362A (en) * | 2020-10-30 | 2021-01-29 | 山东海富光子科技股份有限公司 | High-power high-energy pulse all-fiber laser for laser cleaning |
| CN113964629A (en) * | 2021-09-29 | 2022-01-21 | 浙江振东光电科技有限公司 | Pulse fiber laser background noise suppression system and suppression method |
| CN113991401A (en) * | 2021-10-27 | 2022-01-28 | 北京热刺激光技术有限责任公司 | Fiber laser and laser beam combining system |
| CN114039264A (en) * | 2021-11-30 | 2022-02-11 | 湖北久之洋信息科技有限公司 | Pre-charging quick-start fiber laser |
| CN116154590A (en) * | 2023-02-20 | 2023-05-23 | 上海瑞柯恩激光技术有限公司 | Fiber laser and fiber laser treatment device |
| CN116154590B (en) * | 2023-02-20 | 2024-03-05 | 上海瑞柯恩激光技术有限公司 | Fiber laser and fiber laser treatment device |
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