CN212908503U - Optical fiber type narrow linewidth optical fiber laser - Google Patents
Optical fiber type narrow linewidth optical fiber laser Download PDFInfo
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- CN212908503U CN212908503U CN202021663253.4U CN202021663253U CN212908503U CN 212908503 U CN212908503 U CN 212908503U CN 202021663253 U CN202021663253 U CN 202021663253U CN 212908503 U CN212908503 U CN 212908503U
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Abstract
An optical fiber type narrow linewidth optical fiber laser comprises 3 continuous wave seed sources, a 3 x 1 beam combiner, an electro-optical modulator, a seed source amplifying device, an optical beam splitter and a main power amplifying device, wherein the continuous wave seed sources, the 3 x 1 beam combiner, the electro-optical modulator, the seed source amplifying device, the optical beam splitter and the main power amplifying device are sequentially connected from left to right; and 3 continuous seed optical signals emitted by the continuous wave seed sources are combined by a 3 multiplied by 1 beam combiner, are pulsed into pulse signals by the electro-optical modulator, and the pulse signals are output after being subjected to power amplification by a seed source amplifying device, an optical beam splitter and a main power amplifying device in sequence. Optical fiber formula narrow linewidth fiber laser, adopt three spectral line structures, it is effectual to the suppression of stimulated brillouin scattering effect among the narrow linewidth pulse fiber amplifier, amplify through the two-stage of seed source amplification device, main power amplification device and cascade power and enlarge, promoted power, application prospect is extensive.
Description
Technical Field
The utility model relates to a fiber laser technical field, concretely relates to narrow linewidth fiber laser of optic fibre formula.
Background
The principle of lasers is to use stimulated radiation to cause amplified or oscillatory emission of light in certain excited species. The fiber laser adopts an optical fiber doped with rare earth ions or a nonlinear effect of the optical fiber as a gain medium of the fiber laser, forms high power density in a fiber core of the optical fiber under the action of pumping laser, causes the population inversion of the doped ion energy level in the optical fiber, and then oscillates back and forth in a resonant cavity to form laser output. Compared with the traditional solid laser, the fiber laser has the advantages of good beam quality, high conversion efficiency, compact structure, high stability and the like.
Among them, Stimulated Brillouin Scattering (SBS) is a very important nonlinear effect in an optical fiber, which is a nonlinear scattering of incident light by a strongly induced acoustic wave field generated by electrostriction of strong laser in a medium, and is very easily generated in the optical fiber due to its low threshold, causing energy loss of the incident light as a signal carrier in the optical fiber system, and the backward scattered light may cause damage to a light source, thereby limiting the power of the entering optical fiber and the transmission distance of the system. For a single-frequency fiber laser, the threshold of the Stimulated Brillouin Scattering (SBS) effect is low, and the power increase of a narrow-linewidth fiber laser is limited, so how to effectively inhibit the Stimulated Brillouin Scattering (SBS) effect to improve the power of the narrow-linewidth fiber laser becomes a research hotspot in related fields in recent years. Therefore, it is necessary to develop an optical fiber type narrow linewidth optical fiber laser, which can effectively suppress the Stimulated Brillouin Scattering (SBS) effect to improve the power and the transmission distance of the system.
Chinese patent application No. CN201821533084.5 discloses a fiber laser system convenient to change laser output optical cable and indicator, the purpose is through changing QBH output optical fiber, during the indicator, can maintain at the industrial processing scene, need not to transport fiber laser system back to ultra-clean laboratory and maintain, does not solve the problem that the stimulated brillouin scattering effect of narrow linewidth fiber laser leads to the transmission distance decline of power and system.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: in order to overcome not enough above, the utility model aims at providing an optical fiber type narrow linewidth fiber laser, structural design is reasonable, adopts three spectral line structures, and is good to the suppression effect of the stimulated brillouin scattering effect among the narrow linewidth pulse fiber amplifier, and the power amplification is cascaded in the amplification of two-stage through seed source amplification device, main power amplification device, has promoted power, and application prospect is extensive.
The technical scheme is as follows: an optical fiber type narrow linewidth optical fiber laser comprises 3 continuous wave seed sources, a 3 x 1 beam combiner, an electro-optical modulator, a seed source amplifying device, an optical beam splitter and a main power amplifying device, wherein the continuous wave seed sources, the 3 x 1 beam combiner, the electro-optical modulator, the seed source amplifying device, the optical beam splitter and the main power amplifying device are sequentially connected from left to right; and 3 continuous seed optical signals emitted by the continuous wave seed sources are combined by a 3 multiplied by 1 beam combiner, are pulsed into pulse signals by the electro-optical modulator, and the pulse signals are output after being subjected to power amplification by a seed source amplifying device, an optical beam splitter and a main power amplifying device in sequence.
Optical fiber formula narrow linewidth fiber laser, structural design is reasonable, adopts three spectral line structures, good to the suppression effect of stimulated brillouin scattering effect among the narrow linewidth pulse fiber amplifier, amplify through the two-stage of seed source amplification device, main power amplification device and cascade power amplification, promoted power, application prospect is extensive.
The working process is as follows: the continuous seed optical signals of 3 sets of continuous wave seed sources are combined by a 3 multiplied by 1 beam combiner, the combined continuous seed optical signals are pulsed by an electro-optical modulator, and the power of the pulse signal light is amplified by a seed source amplifying device and a main power amplifying device. Wherein, 3 sets of continuous wave seed sources are arranged for expanding the line width, so that the line width of a spectrum synthesized by a 3 multiplied by 1 beam combiner reaches a wider value, but the actual width of a single spectrum line still keeps a narrow line width state, and the Stimulated Brillouin Scattering (SBS) effect generated in the power amplification process of a narrow line width optical fiber laser can be effectively inhibited; an optical beam splitter is connected between the seed source amplifying device and the main power amplifying device and is used for monitoring reverse optical power, forward power and power stability.
Furthermore, in the optical fiber type narrow linewidth optical fiber laser, the continuous wave seed source, the 3 × 1 beam combiner, the electro-optical modulator, the seed source amplifying device, the optical beam splitter and the main power amplifying device are all connected by an optical fiber fusion coating technology.
Further, in the optical fiber type narrow linewidth optical fiber laser, the electro-optical modulator is provided with a modulation device, the modulation device includes an arbitrary waveform generator and a radio frequency amplifier, the arbitrary waveform generator, the radio frequency amplifier and the electro-optical modulator are sequentially connected, the arbitrary waveform generator generates a modulation signal, and the modulation signal is amplified by the radio frequency amplifier and then drives the electro-optical modulator to control the turn-off of the seed optical signal.
Optical fiber formula narrow linewidth fiber laser adopts electro-optic modulator to carry out pulse chopping, can not exert an influence to the spectral characteristic of seed signal, has kept the linewidth of original seed light well. The modulation signal is generated by the random waveform generator, and the modulation signal is amplified by the radio frequency amplifier and then drives the electro-optical modulator to control the turn-off of the seed optical signal, so that the principle is simple and easy to realize.
Further, the modulation device of the optical fiber type narrow linewidth optical fiber laser further comprises a Tap coupler and a bias controller, and the electro-optic modulator, the Tap coupler, the bias controller and the electro-optic modulator are sequentially connected; pulse signal light output by the electro-optical modulator is coupled out through a Tap coupler and input to a bias voltage controller, and the bias voltage controller is used for locking the operating point of the Mach-Zehnder modulator of the electro-optical modulator.
The pulse signal light output by the electro-optical modulator is coupled out by about 1% through the Tap coupler and is input into the bias controller, so that the working point of the Mach-Zehnder modulator of the electro-optical modulator can be accurately locked, direct-current component of seed light is reduced, the implementation is easy, and the accuracy is high.
Furthermore, in the optical fiber type narrow linewidth optical fiber laser, the seed source amplifying device includes a first isolator, a first semiconductor pump two laser, a first pump beam combiner, a first ytterbium-doped double-clad gain optical fiber and a second isolator, and the first isolator, the first semiconductor pump two laser, the first pump beam combiner, the first ytterbium-doped double-clad gain optical fiber and the second isolator are sequentially connected.
The first isolator and the second isolator are used for preventing the backscattering light from damaging the optical device at the front stage, the semiconductor pump two lasers couple pulse signal light and pump light through the pump beam combiner and enter the first ytterbium-doped double-clad gain fiber, the gain fiber of the first ytterbium-doped double-clad gain fiber absorbs the pump light, and the pulse signal light is excited to generate amplified pulse signal light which is used for preventing the backscattering light from damaging the optical device at the front stage. The optical devices are also connected by fiber fusion coating techniques.
Further, in the optical fiber type narrow linewidth optical fiber laser, the main power amplifying device includes a second semiconductor pump laser, a second pump beam combiner, a second ytterbium-doped double-clad gain optical fiber, a second pump light filter, and a third isolator, and the second semiconductor pump laser, the second pump beam combiner, the second ytterbium-doped double-clad gain optical fiber, the pump light filter, and the third isolator are sequentially connected.
The working principle of the main power amplification device is the same as that of the neutron source amplification device, and the main power amplification device and the neutron source amplification device are connected through an optical fiber fusion coating technology.
Furthermore, in the optical fiber type narrow linewidth optical fiber laser, a 3m energy transmission optical fiber is welded behind the third isolator.
For preventing the backscattered light from damaging the front stage optics.
Further, in the optical fiber type narrow linewidth optical fiber laser, the output adopts a collimation isolation or 8-degree angle mode.
For preventing the backscattered light from damaging the front stage optics.
The utility model has the advantages that:
(1) the optical fiber type narrow linewidth optical fiber laser has reasonable structural design, adopts a three-spectral-line structure, has good inhibition effect on stimulated Brillouin scattering effect in a narrow linewidth pulse optical fiber amplifier, and carries out cascade power amplification through two-stage amplification of a seed source amplification device and a main power amplification device, thereby improving the power and having wide application prospect;
(2) the optical fiber type narrow linewidth optical fiber laser adopts the electro-optical modulator to carry out pulse chopping, does not influence the spectral characteristics of seed signals, and well keeps the linewidth of original seed light; the modulation signal is generated by the random waveform generator, the modulation signal is amplified by the radio frequency amplifier and then drives the electro-optic modulator to control the turn-off of the seed optical signal, about 1 percent of the modulation signal is coupled out by the Tap coupler and then is input into the bias voltage controller, the working point of the Mach-Zehnder modulator of the electro-optic modulator can be accurately locked, the direct current component of the seed optical is reduced, and the principle is simple and easy to realize.
Drawings
Fig. 1 is a schematic diagram of an overall connection of an optical fiber type narrow linewidth optical fiber laser according to the present invention;
fig. 2 is a schematic connection diagram of a seed source amplifying device of an optical fiber type narrow linewidth optical fiber laser according to the present invention;
fig. 3 is a schematic connection diagram of a main power amplifying device of the optical fiber type narrow linewidth fiber laser according to the present invention;
in the figure: the device comprises a continuous wave seed source 1, a 3 multiplied by 1 beam combiner 2, an electro-optical modulator 3, a modulation device 31, an arbitrary waveform generator 311, a radio frequency amplifier 312, a Tap coupler 313, a bias voltage controller 314, a seed source amplification device 4, a first isolator 41, a first semiconductor pump two laser 42, a first pump beam combiner 43, a first ytterbium-doped double-clad gain fiber 44, a second isolator 45, an optical beam splitter 5, a main power amplification device 6, a second semiconductor pump laser 61, a second pump beam combiner 62, a second ytterbium-doped double-clad gain fiber 63, a pump light filter 64 and a third isolator 65.
Detailed Description
The invention will be further elucidated with reference to the accompanying figures 1-3 and the specific embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", 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 being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
The optical fiber type narrow linewidth optical fiber laser with the structure shown in fig. 1 comprises 3 continuous wave seed sources 1, a 3 × 1 beam combiner 2, an electro-optical modulator 3, a seed source amplifying device 4, an optical beam splitter 5 and a main power amplifying device 6, wherein the continuous wave seed sources 1, the 3 × 1 beam combiner 2, the electro-optical modulator 3, the seed source amplifying device 4, the optical beam splitter 5 and the main power amplifying device 6 are sequentially connected from left to right; the continuous seed optical signals emitted by the 3 continuous wave seed sources 1 are combined by a 3 x 1 beam combiner 2, and are pulsed into pulse signals by the electro-optical modulator 3, and the pulse signals are output after being subjected to power amplification by a seed source amplifying device 4, an optical beam splitter 5 and a main power amplifying device 6 in sequence.
In addition, the continuous wave seed source 1, the 3 × 1 beam combiner 2, the electro-optical modulator 3, the seed source amplifying device 4, the optical beam splitter 5 and the main power amplifying device 6 are all connected through an optical fiber fusion coating technology.
In addition, the electro-optical modulator 3 is provided with a modulation device 31, the modulation device 31 includes an arbitrary waveform generator 311 and a radio frequency amplifier 312, the arbitrary waveform generator 311, the radio frequency amplifier 312 and the electro-optical modulator 3 are sequentially connected, the arbitrary waveform generator 311 generates a modulation signal, and the modulation signal is amplified by the radio frequency amplifier 312 and then drives the electro-optical modulator 3 to control the turn-off of the seed optical signal.
In addition, the modulation device 31 further includes a Tap coupler 313 and a bias controller 314, and the electro-optical modulator 3, the Tap coupler 313, the bias controller 314 and the electro-optical modulator 3 are sequentially connected; the pulse signal light output by the electro-optical modulator 3 is coupled out by a Tap coupler 313 and input to a bias controller 314, and the bias controller 314 is used for locking the operating point of the mach-zehnder modulator of the electro-optical modulator 3.
In addition, as shown in fig. 2, the seed source amplifying device 4 includes a first isolator 41, a first semiconductor pump two laser 42, a first pump beam combiner 43, a first ytterbium-doped double-clad gain fiber 44, and a second isolator 45, where the first isolator 41, the first semiconductor pump two laser 42, the first pump beam combiner 43, the first ytterbium-doped double-clad gain fiber 44, and the second isolator 45 are sequentially connected.
In addition, as shown in fig. 3, the main power amplifying device 6 includes a second semiconductor pump laser 61, a second pump beam combiner 62, a second ytterbium-doped double-clad gain fiber 63, a pump light filter 64, and a third isolator 65, where the second semiconductor pump laser 61, the second pump beam combiner 62, the second ytterbium-doped double-clad gain fiber 63, the pump light filter 64, and the third isolator 65 are sequentially connected.
Further, a 3m energy transmitting fiber was fused after the third isolator 65.
Further, the output adopts a collimation isolation or 8-degree angle mode.
Examples
The structural basis is as shown in FIGS. 1 to 3.
Optical fiber formula narrow linewidth fiber laser, structural design is reasonable, adopts three spectral line structures, good to the suppression effect of stimulated brillouin scattering effect among the narrow linewidth pulse fiber amplifier, amplify through the two-stage of seed source amplification device 4, main power amplification device 6 and cascade power and enlarge, promoted power, application prospect is extensive.
The working process is as follows: the continuous seed optical signals of 3 sets of continuous wave seed sources 1 are combined by a 3 multiplied by 1 beam combiner 2, the combined continuous seed optical signals are pulsed by an electro-optical modulator 3, and the pulse signal light is subjected to power amplification by a seed source amplifying device 4 and a main power amplifying device 6. The method comprises the following steps that 3 sets of continuous wave seed sources 1 are arranged for expanding line width, so that the line width of a spectrum synthesized by a 3 x 1 beam combiner reaches a wider value, but the actual width of a single spectrum still keeps a narrow line width state, and the stimulated Brillouin scattering SBS effect generated in the power amplification process of a narrow line width optical fiber laser can be effectively inhibited; an optical beam splitter 5 is connected between the seed source amplifying device 4 and the main power amplifying device 6 and is used for monitoring the reverse optical power, the forward power and the power stability.
Optical fiber formula narrow linewidth fiber laser adopts electro-optic modulator 3 to carry out pulse chopping, can not exert an influence to the spectral characteristic of seed signal, has kept the linewidth of original seed light well. The modulation signal is generated by the arbitrary waveform generator 311, the modulation signal is amplified by the radio frequency amplifier 312 and drives the electro-optical modulator 3 to control the turn-off of the seed optical signal, the pulse signal output by the electro-optical modulator 3 is coupled out by about 1% through the Tap coupler 313 and is input into the bias controller 314, the working point of the Mach-Zehnder modulator of the electro-optical modulator 3 can be accurately locked, the direct current component of the seed optical is reduced, and the principle is simple and easy to realize.
A 3m energy-transmitting fiber is welded behind the third isolator 65, and the output adopts a collimation isolation or 8-degree angle mode, which are measures for preventing the backward scattering light from damaging the optical device at the front stage.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the details of the above embodiments, and the technical concept of the present invention can be within the scope of the present invention to perform various simple modifications to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and in order to avoid unnecessary repetition, the present invention does not need to describe any combination of the features.
In addition, the embodiments of the present invention can be arbitrarily combined with each other, and the same shall be regarded as the disclosure of the present invention as long as the idea of the present invention is not violated.
Claims (8)
1. An optical fiber type narrow linewidth optical fiber laser is characterized by comprising 3 continuous wave seed sources (1), a 3 x 1 beam combiner (2), an electro-optical modulator (3), a seed source amplifying device (4), an optical beam splitter (5) and a main power amplifying device (6), wherein the continuous wave seed sources (1), the 3 x 1 beam combiner (2), the electro-optical modulator (3), the seed source amplifying device (4), the optical beam splitter (5) and the main power amplifying device (6) are sequentially connected from left to right; the continuous seed optical signals emitted by the 3 continuous wave seed sources (1) are combined by the 3 multiplied by 1 beam combiner (2), the continuous seed optical signals are pulsed into pulse signals by the electro-optical modulator (3), and the pulse signals are output after power amplification is carried out on the pulse signals sequentially by the seed source amplifying device (4), the optical beam splitter (5) and the main power amplifying device (6).
2. The optical fiber type narrow linewidth optical fiber laser device according to claim 1, wherein the continuous wave seed source (1), the 3 x 1 beam combiner (2), the electro-optical modulator (3), the seed source amplifying device (4), the optical beam splitter (5) and the main power amplifying device (6) are connected by an optical fiber fusion coating technology.
3. The optical fiber type narrow linewidth optical fiber laser device according to claim 1, wherein a modulation device (31) is disposed on the electro-optical modulator (3), the modulation device (31) includes an arbitrary waveform generator (311) and a radio frequency amplifier (312), the arbitrary waveform generator (311), the radio frequency amplifier (312) and the electro-optical modulator (3) are sequentially connected, the arbitrary waveform generator (311) generates a modulation signal, and the modulation signal is amplified by the radio frequency amplifier (312) and drives the electro-optical modulator (3) to control turn-off of the seed optical signal.
4. The optical fiber type narrow linewidth optical fiber laser according to claim 3, wherein the modulation device (31) further comprises a Tap coupler (313) and a bias controller (314), and the electro-optical modulator (3), the Tap coupler (313), the bias controller (314) and the electro-optical modulator (3) are connected in sequence; the pulse signal light output by the electro-optical modulator (3) is coupled out by a Tap coupler (313) and input to a bias voltage controller (314), and the bias voltage controller (314) is used for locking the Mach-Zehnder modulator operating point of the electro-optical modulator (3).
5. The optical fiber type narrow linewidth optical fiber laser device according to claim 1, wherein the seed source amplifying device (4) comprises a first isolator (41), a first semiconductor pump two laser (42), a first pump beam combiner (43), a first ytterbium-doped double-clad gain optical fiber (44), a second isolator (45), and the first isolator (41), the first semiconductor pump two laser (42), the first pump beam combiner (43), the first ytterbium-doped double-clad gain optical fiber (44), and the second isolator (45) are connected in sequence.
6. The optical fiber type narrow linewidth optical fiber laser device according to claim 5, wherein the main power amplifying device (6) comprises a second semiconductor pump laser (61), a second pump beam combiner (62), a second ytterbium-doped double-clad gain optical fiber (63), a second pump light filter (64), and a third isolator (65), and the second semiconductor pump laser (61), the second pump beam combiner (62), the second ytterbium-doped double-clad gain optical fiber (63), the second pump light filter (64), and the third isolator (65) are connected in sequence.
7. The fiber-optic narrow linewidth fiber laser of claim 6, wherein a 3m energy-conducting fiber is fused after the isolator three (65).
8. The fiber-optic narrow linewidth fiber laser of claim 1, wherein the output is in a collimated isolated or 8 ° angle manner.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113437627A (en) * | 2021-06-07 | 2021-09-24 | 中国科学院上海光学精密机械研究所 | Tunable multi-wavelength multiplexing spectrum modulation and separation system for high-power optical fiber laser amplification |
| CN114465079A (en) * | 2022-01-26 | 2022-05-10 | 中国电子科技集团公司第十一研究所 | Narrow-linewidth pulse fiber laser and control method thereof |
| CN115693359A (en) * | 2022-11-08 | 2023-02-03 | 上海频准激光科技有限公司 | Optical fiber laser and polarization state switching method thereof |
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2020
- 2020-08-11 CN CN202021663253.4U patent/CN212908503U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113437627A (en) * | 2021-06-07 | 2021-09-24 | 中国科学院上海光学精密机械研究所 | Tunable multi-wavelength multiplexing spectrum modulation and separation system for high-power optical fiber laser amplification |
| CN114465079A (en) * | 2022-01-26 | 2022-05-10 | 中国电子科技集团公司第十一研究所 | Narrow-linewidth pulse fiber laser and control method thereof |
| CN114465079B (en) * | 2022-01-26 | 2023-10-27 | 中国电子科技集团公司第十一研究所 | Narrow linewidth pulse fiber laser and control method thereof |
| CN115693359A (en) * | 2022-11-08 | 2023-02-03 | 上海频准激光科技有限公司 | Optical fiber laser and polarization state switching method thereof |
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