CN112821178A - Multi-beam pulse fiber laser - Google Patents
Multi-beam pulse fiber laser Download PDFInfo
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- CN112821178A CN112821178A CN202110010541.2A CN202110010541A CN112821178A CN 112821178 A CN112821178 A CN 112821178A CN 202110010541 A CN202110010541 A CN 202110010541A CN 112821178 A CN112821178 A CN 112821178A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
- H01S3/06758—Tandem amplifiers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
- G01S7/484—Transmitters
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Abstract
The invention discloses a multi-beam pulse optical fiber laser, which belongs to the technical field of laser and comprises a pulse seed source, a primary optical fiber amplification component, a plurality of paths of secondary optical fiber amplification components, a plurality of paths of output tail fibers and at least one optical fiber beam splitter. The invention adopts the all-fiber structure to output multi-path laser pulses with synchronous time and consistent energy, thereby reducing the difficulty of subsequent laser beam splitting and improving the system integration level; high-power laser is generated through multi-path optical fiber amplification, and the nonlinear effect (ASE) of the optical fiber and the risk of damage to the end face of the optical fiber are reduced; the single-mode optical fiber is adopted to realize high-power multi-beam output, the size and the cost of a device are reduced, output laser has better beam quality, and the difficulty in mode field matching is reduced; the system has expandability, is easy to realize more output paths, and improves the total power of laser output.
Description
Technical Field
The invention relates to the technical field of laser, in particular to a multi-beam pulse fiber laser.
Background
The laser radar is an active photoelectric detection technology, has higher spatial resolution and ranging precision, is slightly influenced by electromagnetic interference, can work all day long, and has wide application prospect in the fields of topographic mapping, precise guidance, automatic driving and the like; the existing laser radar mainly adopts a pulse ranging mode and realizes high-precision ranging by emitting narrow-pulse-width laser; in long-distance application, the laser radar generally needs to emit laser with high pulse repetition frequency and high pulse energy to realize rapid ranging; on airborne platforms, satellite-borne platforms and the like, in order to improve the space coverage rate, the laser radar is developing towards a multi-beam transmitting and receiving mode; on the basis of a traditional laser altimeter, a multi-beam laser radar can realize large-amplitude wide measurement by combining a high-sensitivity single-photon detection technology. Therefore, high power, multi-beam laser emission is a critical part of lidar.
An ICESAT-II satellite emitted by NASA in 2018 carries ATLAS multi-beam laser radar load, and realizes earth observation by adopting a 6-beam emitting and receiving mode; the NASA next step plans to develop a single photon detection laser radar (LIST plan) with more than 1000 beams; in order to verify the technical feasibility of the satellite-borne multi-beam laser radar, 16-beam single-photon detection laser radar SIMPL and 215-beam single-photon detection laser radar MABEL are developed in the early stage of NASA, and an airborne flight test is completed. A51-beam single-photon detection laser radar is developed by Shanghai technology of Chinese academy of sciences in China, and a 100-beam single-photon detection laser radar is developed by university of east China.
At present, the multi-beam laser radar mainly adopts two emission modes including an optical fiber array and a Diffraction Optical Element (DOE), wherein the optical fiber array is of an all-fiber structure, multi-beam precise emission can be realized through optical fiber close arrangement, and the stability is higher. The fiber array emission mode firstly adopts a multi-stage beam splitter to evenly divide the laser energy into multiple paths of optical fibers. Under the condition of high laser power, in order to avoid the damage of the end face of the optical fiber, the front-end high-power laser beam splitting firstly adopts a space light beam splitting mode. For example: the multi-beam laser radar adopts a space light output laser as a main light source, firstly, laser is subjected to power distribution through a space light beam splitter and distributed into dozens of channels, so that the laser pulse energy of each channel is lower than the optical fiber damage threshold; then the laser is coupled into the optical fiber through the optical fiber collimator, and finally the light is split through a plurality of optical fiber beam splitters. The multi-beam laser emission mode adopts a beam splitting mode combining space light and optical fibers, the space light path is complex and large in size, and after the influence of factors such as external temperature change, vibration and the like, the optical fiber coupling efficiency is easily reduced, so that the multi-beam energy and consistency are reduced. To this end, a multi-beam pulse fiber laser is proposed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to realize the integrated design of all optical fibers, reduce the volume and the weight of a system and improve the stability, and provides a multi-beam pulse optical fiber laser.
The invention solves the technical problems by the following technical scheme, and the pulse fiber amplifying device comprises a pulse seed source, a primary fiber amplifying assembly, a plurality of secondary fiber amplifying assemblies, a plurality of output tail fibers and at least one fiber beam splitter, wherein the output end of the pulse seed source is connected with the input end of the primary fiber amplifying assembly, the output end of the primary fiber amplifying assembly is connected with the input end of the fiber beam splitter, the output end of the fiber beam splitter is correspondingly connected with the input ends of the plurality of secondary fiber amplifying assemblies, and the plurality of output tail fibers are correspondingly connected with the output ends of the plurality of secondary fiber amplifying assemblies.
Furthermore, the multi-beam pulse fiber laser further includes a first isolator and a plurality of second isolators, the first isolator is disposed between the fiber splitter and the primary fiber amplification assembly, and each of the second isolators is correspondingly disposed between the secondary fiber amplification assembly and the output pigtail.
Furthermore, the primary optical fiber amplification component and the secondary optical fiber amplification component have the same structure and respectively comprise a beam combiner, an active gain optical fiber and a pumping source, the pumping source is connected with one input end of the beam combiner, the pulse seed source is connected with the other output end of the beam combiner, and the output end of the beam combiner is connected with the active gain optical fiber.
Further, the beam splitter comprises a one-to-two beam splitter with multiple stages of 50:50, and the multiple stages of the one-to-two beam splitter with 50:50 are cascaded.
Furthermore, the pulse seed source, the primary optical fiber amplification component, the secondary optical fiber amplification component and the output tail fiber all adopt single-mode optical fibers.
Furthermore, the pulse seed source adopts a direct modulation mode, and generates nanosecond-level pulse width-adjustable pulse laser with adjustable repetition frequency through the control of an external driving circuit.
Compared with the prior art, the invention has the following advantages: according to the multi-beam pulse optical fiber laser, the multi-path laser pulses with synchronous time and consistent energy are output by adopting an all-fiber structure, the difficulty of subsequent laser beam splitting is reduced, and the system integration level is improved; high-power laser is generated through multi-path optical fiber amplification, and the nonlinear effect (ASE) of the optical fiber and the risk of damage to the end face of the optical fiber are reduced; the single-mode optical fiber is adopted to realize high-power multi-beam output, the size and the cost of a device are reduced, output laser has better beam quality, and the difficulty in mode field matching is reduced; the system has expandability, is easy to realize more output paths, improves the total power of laser output, and is worth being popularized and used.
Drawings
FIG. 1 is a schematic structural diagram of a fiber laser according to a second embodiment of the present invention;
FIG. 2 is a schematic diagram of a specific embodiment of the second embodiment of the present invention.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example one
The embodiment provides a technical scheme: the utility model provides a multi-beam pulse fiber laser, includes pulse seed source, one-level optic fibre amplifier module, multichannel second grade optic fibre amplifier module, multiplexed output tail fiber, at least one fiber splitter, the output of pulse seed source with the input of one-level optic fibre amplifier module is connected, the output of one-level optic fibre amplifier module with the input of fiber splitter is connected, the output and the multichannel of fiber splitter the input of second grade optic fibre amplifier module corresponds to be connected, the multichannel output tail fiber and multichannel the output of second grade optic fibre amplifier module corresponds to be connected.
In this embodiment, the multi-beam pulse fiber laser further includes a first isolator and a plurality of second isolators, the first isolator is disposed between the fiber splitter and the primary fiber amplification assembly, and each of the second isolators is correspondingly disposed between the secondary fiber amplification assembly and the output pigtail.
In this embodiment, the primary fiber amplification component and the secondary fiber amplification component have the same structure, and each of the primary fiber amplification component and the secondary fiber amplification component includes a beam combiner, an active gain fiber, and a pump source, the pump source is connected to one input end of the beam combiner, the pulse seed source is connected to the other output end of the beam combiner, and the output end of the beam combiner is connected to the active gain fiber.
In this embodiment, the beam splitter includes a one-to-two beam splitter with multiple stages 50:50, and the multiple stages of the one-to-two beam splitter with 50:50 are cascaded.
In this embodiment, the pulse seed source, the primary optical fiber amplification component, the secondary optical fiber amplification component, and the output pigtail all adopt single-mode optical fibers.
In this embodiment, the pulse seed source is controlled by an external driving circuit to generate nanosecond-level pulse-width-adjustable and repetition-frequency-adjustable pulse laser in a direct modulation manner.
Example two
As shown in fig. 1, taking a 4-channel output fiber laser as an example, the present embodiment mainly includes a pulse seed source 1, a primary fiber amplification module 2, four secondary fiber amplification modules 3, multiple channels of output pigtails 4 arranged in parallel, and three fiber splitters 5, and the whole adopts a main power oscillation amplification MOPA structure, wherein the pulse seed source 1 is connected with an input end of the primary fiber amplification module 2, an output end of the primary fiber amplification module 2 is connected with one fiber splitter 5, the remaining two fiber splitters 5 are cascaded with the fiber splitter 5, four output ends of the two fiber splitters 5 are respectively connected with the four secondary fiber amplification modules 3, and the four secondary fiber amplification modules 3 are respectively connected with the output pigtails 4 in each channel in a one-to-one correspondence.
In the embodiment shown in fig. 2, the primary fiber amplifier assembly 2 includes a beam combiner 7, an active gain fiber 8, and a pump source 9; the beam combiner 7 is a wavelength division multiplexing device, combines two lasers with different wavelengths, namely a laser seed source 1 and a pumping source 9, and couples the lasers to an active gain fiber 8; the pumping source 9 realizes population inversion in the active gain fiber 8, and the laser seed source 1 realizes stimulated radiation amplification in the transmission process in the active gain fiber 8; the primary optical fiber amplification component 2 and the secondary optical fiber amplification component 3 are separated from each other through an isolator 10, so that backward scattering laser is avoided; each stage of optical fiber beam splitter 5 is a 50:50 one-to-two beam splitter 6 which equally divides the laser energy; each path of secondary optical fiber amplification component 3 has the same composition structure as the primary optical fiber amplification component 2, and also comprises a pumping source, an active gain optical fiber and a beam combiner; the secondary fiber amplifier assembly 3 and the output pigtail 4 are also separated from each other by an isolator, again to avoid back-scattering the laser light.
By amplifying and distributing the laser power on different secondary optical fiber amplifying components 3, the power of each path is reduced under the condition of meeting the requirement of high-power laser output, and the nonlinear effect of high-power laser in optical fibers and the risk of damage to the end faces of the optical fibers are reduced; through the cascade of one-to-two beam splitters, multi-path laser is easy to generate, and the advantages of light beam quantity expansibility and energy uniformity are achieved.
In the embodiment, the pulse seed source 1 modulates the continuous seed source into pulse laser with adjustable pulse width and adjustable repetition frequency through an external driving circuit; the primary optical fiber amplifying component 2 adopts a circuit to drive a pumping source; and one circuit of the secondary optical fiber amplification component 3 drives four pumping sources, so that the complexity of a driving circuit is reduced.
In the embodiment, the pulse seed source 1, the primary optical fiber amplification component 2, the secondary optical fiber amplification component 3 and the output tail fiber 4 all adopt 9/125 μm single-mode optical fibers, wherein the optical fiber amplification component adopts active optical fibers, ytterbium-doped optical fibers are adopted for 1550nm band laser, and erbium-doped optical fibers are adopted for 1064nm band laser. The full optical fiber structure reduces the volume and the cost of the device, so that the output laser has better beam quality, and the difficulty of mode field matching is reduced.
To sum up, the multi-beam pulse optical fiber laser of the above embodiment outputs multiple paths of laser pulses with synchronous time and consistent energy by adopting an all-fiber structure, thereby reducing the difficulty of subsequent laser beam splitting and improving the system integration level; high-power laser is generated through multi-path optical fiber amplification, and the nonlinear effect (ASE) of the optical fiber and the risk of damage to the end face of the optical fiber are reduced; the single-mode optical fiber is adopted to realize high-power multi-beam output, the size and the cost of a device are reduced, output laser has better beam quality, and the difficulty in mode field matching is reduced; the system has expandability, is easy to realize more output paths, improves the total power of laser output, and is worth being popularized and used.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (6)
1. A multi-beam pulse fiber laser characterized by: the pulse seed source comprises a pulse seed source, a primary optical fiber amplification component, a plurality of secondary optical fiber amplification components, a plurality of output tail fibers and at least one optical fiber beam splitter, wherein the output end of the pulse seed source is connected with the input end of the primary optical fiber amplification component, the output end of the primary optical fiber amplification component is connected with the input end of the optical fiber beam splitter, the output ends of the optical fiber beam splitters are respectively correspondingly connected with the input ends of the plurality of secondary optical fiber amplification components, and the plurality of output tail fibers are correspondingly connected with the output ends of the plurality of secondary optical fiber amplification components.
2. A multi-beam pulse fiber laser according to claim 1, characterized in that: the multi-beam pulse fiber laser further comprises a first isolator and a plurality of second isolators, the first isolator is arranged between the fiber beam splitter and the primary fiber amplification assembly, and each second isolator is correspondingly arranged between the secondary fiber amplification assembly and the output tail fiber.
3. A multi-beam pulse fiber laser according to claim 2, characterized in that: the primary optical fiber amplification component and the secondary optical fiber amplification component have the same structure and respectively comprise a beam combiner, an active gain optical fiber and a pumping source, the pumping source is connected with one input end of the beam combiner, the pulse seed source is connected with the other output end of the beam combiner, and the output end of the beam combiner is connected with the active gain optical fiber.
4. A multi-beam pulse fiber laser according to claim 3, characterized in that: the beam splitter comprises a multi-stage 50:50 one-to-two beam splitter, and the multi-stage 50:50 one-to-two beam splitter is cascaded.
5. The multi-beam pulse fiber laser of claim 4, wherein: the pulse seed source, the primary optical fiber amplification component, the secondary optical fiber amplification component and the output tail fiber all adopt single-mode optical fibers.
6. The multi-beam pulse fiber laser of claim 5, wherein: the pulse seed source adopts a direct modulation mode and generates nanosecond-level pulse width-adjustable pulse laser with adjustable repetition frequency through the control of an external driving circuit.
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| CN202110010541.2A CN112821178A (en) | 2021-01-06 | 2021-01-06 | Multi-beam pulse fiber laser |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113406603A (en) * | 2021-08-19 | 2021-09-17 | 武汉镭晟科技有限公司 | Laser module for coherent laser radar |
| CN114061752A (en) * | 2021-11-11 | 2022-02-18 | 中国电子科技集团公司第三十八研究所 | Communication band miniaturization multichannel free operation mode single photon detector and method |
| CN114883898A (en) * | 2022-05-24 | 2022-08-09 | 西安工业大学 | Array distributed high-power all-fiber laser amplifier |
| CN116699561A (en) * | 2023-06-05 | 2023-09-05 | 中国电子科技集团公司第三十八研究所 | Multi-beam laser transceiver based on optical fiber path |
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| CN113406603A (en) * | 2021-08-19 | 2021-09-17 | 武汉镭晟科技有限公司 | Laser module for coherent laser radar |
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| CN116699561A (en) * | 2023-06-05 | 2023-09-05 | 中国电子科技集团公司第三十八研究所 | Multi-beam laser transceiver based on optical fiber path |
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