CN104216123A - Fiber laser array group beam system based on self-adaptation polarization and phase control - Google Patents
Fiber laser array group beam system based on self-adaptation polarization and phase control Download PDFInfo
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Abstract
The invention discloses a fiber laser array group beam system based on self-adaptation polarization and phase control. The system comprises a fiber seed source module used for generating seeded light and dividing the seeded light into multiple sub light beams, a non polarization maintaining optical fiber amplifying module used for amplifying the power of the sub light beams, a main polarization and phase control module used for utilizing the combined light beam ring surrounded light intensity collected by a photoelectric detector as an input signal and controlling the phase and the polarization of a fiber amplifier array to ensure the phase and the polarization of the sub light beams, a beam combination and photoelectric detection module used for conducting coherent group beam output on the amplified sub light beams and detecting the ring surrounded light intensity combined by the light beam. The system is large in combination way number and high in power, does not require polarization and phase relevant detection modules, and is compact in light path circuit detection structure, small in size, high in reliability and capable of achieving full-electric high speed scanning deflection.
Description
Technical field
High power optical fibre laser array Coherent Beam Combination of the present invention, specifically refers to a kind of laser array beam combination system based on self-adaptation polarization and phase control.
Background technology
In light beam is relevant synthetic, phase place and polarization control technology are its keys.Wherein, the combined coefficient based on active control improves along with the quickening of hardware circuit and software algorithm speed, and synthetic number, power expansion are larger.Therefore study based at a high speed, that the active phase control technology of parallelization can be realized large array fibre laser high-efficiency high-quality is relevant synthetic, thereby improve laser output power level and beam quality, the development to laser and application have larger impetus.
At present, the relevant synthesis system of optical-fiber laser is divided into polarization maintaining optical fibre system and Fei Bao mould bigger than normal field fibre system.About optical-fiber laser, relevant synthetic research concentrates on polarization maintaining optical fibre system mostly both at home and abroad, the advantage of this scheme is good beam quality, only need to carry out the phase control of fiber array, technology is simple, but shortcoming is that polarization maintaining optical fibre amplifier output power is low, be unfavorable for expanding to high-power fiber synthesis system.And the latter's advantage is to adopt non-guarantor mould bigger than normal field fiber amplifier, output power is higher, adds Polarization Control, is conducive to realize high power high-efficiency high-quality relevant synthetic.
2012, the locking when people such as the Gregory D. Goodno of Northrop Grumman company of the U.S. utilize many ditherings to take the lead in having realized 5 road non PM fiber laser array phase places and polarization, phase control efficiency reaches 99%, polarization extinction ratio >20dB, and be published in OPTICS LETTERS/Vol. 37, No. 20.This scheme is used double detector structure, can detect in real time the polarization of fiber array and phase place variation, and implement ACTIVE CONTROL, each light beam polarization and phase place are consistent simultaneously, greatly improve combined coefficient, be conducive to the relevant synthetic field expansion of high-power fiber.But this scheme is in order to realize the coherent detection of fiber array polarization and phase place, need: in (one) optical texture, enclose light intensity except receiving the ring of beam array, also need to separate light beam as with reference to light from optical fiber seed source; Then utilize 90 ° of fibre optic mixers by 90 ° of seed source reference light phase shifts in end of probe, make again array synthesize light polarization half-twist, finally the two coupling is exported to two photodetectors, one contains beam array phase information, and another contains beam array polarization information; (2) in control circuit structure, need two coherent detection processes, respectively polarization and phase place are detected in real time.Optical texture and control circuit structure are comparatively complicated like this, and system reliability declines, and volume weight increases.
Summary of the invention
The object of the present invention is to provide a kind of laser array beam combination system based on self-adaptation polarization and phase control, overcome and in existing fiber Coherent Beam Combination, adopt the challenge that needs to build double detector, introduces seed source reference light and 90 ° of fibre optic mixers, polarization and phase place correlation detecting circuits in the lower or non PM fiber light path of the synthetic power of polarization maintaining optical fibre light path.
Object of the present invention is achieved through the following technical solutions:
A laser array beam combination system based on self-adaptation polarization and phase control, is characterized in that: comprise optical fiber seed resource module, non PM fiber amplification module, close bundle and photodetection module and active polarization and phase control module; Wherein
Optical fiber seed resource module: produce seed light and seed light is divided into multichannel beamlet;
Non PM fiber amplification module: for each beamlet is carried out to power amplification;
Close bundle and photodetection module: for synthetic output that each beamlet after amplifying is concerned with, and the synthetic ring of detecting light beam array encloses light intensity;
Initiatively polarization and phase control module: the synthetic light beam ring that photodetector is detected encloses light intensity, as feedback input signal, and controls phase place and the polarization of fiber amplifier array, makes the phase place between each beamlet consistent with polarization, formation closed-loop control.
Described optical fiber seed resource module comprises: fiber laser, produces seed light as optical-fiber laser input end; Optical fiber splitter, carries out beam splitting for the seed light that fiber laser is produced, and beam of laser is divided into the beamlet of multichannel, and each way light beam is through phase place and Polarization Controller.Optical fiber seed resource module of the present invention does not need local oscillator reference light as benchmark, utilize optical fiber splitter that light source is divided into multiple beamlets, key property between these beamlets is similar, directly can be for follow-up control, with respect to the mode using local oscillator reference light as benchmark of the prior art, greatly simplify system, be conducive to realize efficient output.
Described non PM fiber amplification module, comprises N road non PM fiber amplifier, and N is positive integer, for carrying out power amplification through each beamlet of active polarization and phase control module.
The described bundle that closes comprises with photodetection module: collimator array: for each amplification beamlet is collimated, make the output that is parallel to each other of the direction of each beamlet; Long focus lens: the relevant synthetic light beam of collimator array output is focused on, and export target to; The first beam splitter: the light beam after long focus lens focuses on is first divided into two bundles through the first beam splitter by the light beam after focusing on, transmitted light beam directive target, folded light beam is divided into vertical polarization component and horizontal polarization component through polarizing beam splitter mirror PBS, wherein vertical polarization component ingoing power meter, horizontal polarization component enters photodetector; Horizontal polarization component also passes through attenuator, the second beam splitter before entering photodetector successively, and horizontal polarization component is divided into two bundles by the second beam splitter, and wherein transmissive portion enters into photodetector through aperture, and reflecting part enters into CCD camera.
Described active polarization and phase control module comprise opticator and circuit part, and wherein opticator comprises optical fiber waveguide type lithium niobate phase controller, the lithium niobate Polarization Controller of each beamlet process, is the performer of light beam phase place and Polarization Control; Circuit part comprises Polarization Control circuit and phase-control circuit, its ring that photodetector is collected encloses the output of light intensity signal as circuit input signal control lithium niobate phase controller and lithium niobate Polarization Controller, when realizing the polarization of fiber array and phase place, controls.
Described Polarization Control circuit comprises that with phase-control circuit the input signal J being connected is successively evaluation function J, attenuator circuit, AD9244,1#FPGA, wherein on 1#FPGA, be connected with time delay DIP device, three outputs of 1#FPGA are connected to respectively 2#FPGA, 3#FPGA, 4#FPGA, and wherein the output of 2#FPGA is divided into two parts: wherein 7 channel signals pass through successively D/A, IV amplifier, ± 5V amplifier output 1-7 passage to optical fiber waveguide type lithium niobate phase controller and carry out phase control; Other 4 channel signals of 2#FPGA pass through D/A, IV amplifier, ± 30V amplifier output 8-11 passage successively, simultaneously, 12 channel signals of 3#FPGA output pass through successively D/A, IV amplifier, ± 30V amplifier output 12-23 passage, 12 channel signals of 4#FPGA output and pass through successively D/A, IV amplifier, ± 30V amplifier output 24-35 passage, and the acting in conjunction of 8-35 passage is carried out Polarization Control in lithium niobate Polarization Controller.
The present invention compared with prior art, has following advantage and beneficial effect:
A kind of laser array beam combination system based on self-adaptation polarization and phase control of 1 the present invention, adopts non-guarantor mould bigger than normal field fiber amplifier, and than the relevant synthesis system of traditional polarization maintaining optical fibre amplifier, output power is higher, is conducive to realize calibration and amplifies; For example, be applicable at present relevant synthetic narrow linewidth 100kHz～0.5GHz polarization maintaining optical fibre amplifier single fiber output power and mostly be hectowatt grade, output power is less, has limited the output power of the relevant synthesis system of optical-fiber laser; And narrow linewidth GHz magnitude high power non PM fiber amplification module adopts the multistage structure for amplifying of non PM fiber, single fiber output power can reach a kilowatt magnitude, like this, adopt non PM fiber Laser coherent combining technology, in equal synthetic way situation, can greatly improve the output power of relevant synthesis system;
A kind of laser array beam combination system based on self-adaptation polarization and phase control of 2 the present invention, adopt simple detector structure, than the double detector structure of Northrop Grumman company of the aforementioned U.S., do not need to introduce seed source reference light and 90 ° of fibre optic mixers; Light channel structure compactness, reliability is strong, and volume is little, and cost declines to a great extent;
A kind of laser array beam combination system based on self-adaptation polarization and phase control of 3 the present invention, in Northrop Grumman company of U.S. scheme, many ditherings (LOCSET) phase place coherent detection process, each Sine Modulated cycle needs 50 clocks, and for meeting the precision of phase demodulating, its coherent detection process needs i.e. 150～500 clocks of 3～10 Sine Modulated cycles, add the coherent detection process of polarization, consuming time longer, circuit structure complexity, cost is higher; The present invention does not need polarization and phase place coherent detection process, and optimized algorithm operation control rate is fast, and synthetic way is many, and circuit is simple and reliable, is convenient to realize.
Brief description of the drawings
Accompanying drawing described herein is used to provide the further understanding to the embodiment of the present invention, forms the application's a part, does not form the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is the view after principle of the invention block diagram half-twist;
Fig. 2 is the structured flowchart of the present invention's active polarization and phase control module;
Fig. 3 is the circuit block diagram of Polarization Control circuit and phase-control circuit in the present invention.
Mark and corresponding parts title in accompanying drawing:
1-fiber laser, 2-optical fiber splitter, the long focus lens of 3-, 4-the first beam splitter, 5-target, 6-polarizing beam splitter mirror PBS, 7-attenuator, 8-the second beam splitter, 9-power meter, 10-CCD camera, 11-photodetector, 12-lithium niobate phase controller, 13-lithium niobate Polarization Controller, 14-collimator array, 15-non PM fiber amplifier, 16-aperture.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, and exemplary embodiment of the present invention and explanation thereof are only for explaining the present invention, not as a limitation of the invention.
Embodiment
As shown in Figure 1, a kind of laser array beam combination system based on self-adaptation polarization and phase control of the present invention, comprises optical fiber seed resource module, non PM fiber amplification module, closes bundle and photodetection module and active polarization and phase control module; Wherein optical fiber seed resource module comprises: fiber laser 1 selects single-frequency linear polarization single mode fiber laser as seed light source, its output power is 500mW magnitude, live width is 5kHz, power swing <1% p-p, wavelength stability <10pm, polarization extinction ratio >20dB, seed light is exported by tail optical fiber; Optical fiber splitter 2, carry out beam splitting for the laser beam that fiber laser is produced, beam of laser is divided into the beamlet of multichannel, the multichannel beamlet of generation is delivered to high speed lithium niobate phase controller 12 and lithium niobate Polarization Controller 13, controls phase place and the polarization of fiber array; Each beamlet is respectively after fibre-optic waveguide lithium niobate phase controller 12 and lithium niobate Polarization Controller 13, carry out power amplification by non PM fiber amplifier 15, in the present embodiment, non PM fiber amplification module is made up of 7 road non PM fiber amplifiers 15, according to different beam splitting ways, can adopt the non PM fiber amplification module matching; Single channel power input >10mW, through the multistage high power laser light that zooms into of fiber amplifier, live width is GHz magnitude, power swing <2% p-p, optical fiber is large mould field non PM fiber, collimation output beam quality M
2<1.4; Then by collimating apparatus permutation 14: for output that light beam is collimated, the direction of each beamlet is parallel to each other, collimator array 14 adopts hexangle type to arrange, for preventing optical jitter, add the fast anti-mirror of piezoelectric ceramics to point to deviation control, precision is better than 1 μ rad, and the long focus lens 3 that each beamlet of output is f=1m by focal length carries out lens focus, and exports target 5 to; The light focusing at long focus lens 3 be mapped to target 5 before by first beam splitter 4 that is R=0.1% to 1064nm reflectivity, light is divided into two bundles by the first beam splitter 4, transmitted light directive target 5, reflected light is divided into vertical polarization component and horizontal polarization component by a polarizing beam splitter mirror PBS6, vertical polarization component ingoing power meter 9 wherein; And another part horizontal polarization component also passes through successively the attenuator 7 of the 1064nm of T=1% before entering photodetector 11, forms two-beam through the separation of a 5:5 the second beam splitter 8 again, the attenuation rate T=1% of attenuator 7, a branch of directive CCD camera 10 is in order to observe the synthetic hot spot of interfering, and another part enters a photodetector 11 with aperture 16; As shown in Figure 3, the present invention controls as example taking 7 tunnels, adopt precision resistance composition attenuator circuit by 0～5V signal attenuation to 0～2.4V of photodetector (J) output, send into the analog to digital converter AD9224 of 12, the data that collect are carried out computing in 1#FPGA, then walk abreast and send into 2#FPGA, 3#FPGA and 4#FPGA, then synchronously outputed to the high precision digital-to-analog converter AD768 of 16 by control signal; In driving circuit, IV amplifier AD8047 is by be converted to-2.5V of the current signal of D/A converter～+ 2.5V voltage signal, then by be amplified to-5V of MAX4305～+ 5V, phase control 1～7 passage, totally 7, or by be amplified to-30V of OP452～+ 30V, Polarization Control 8～35 passages, totally 28 passages; Introduce the method step that adopts an evaluation function J of the prior art to control below: the diameter of aperture is got synthetic beam diffraction limit size, light intensity in the aperture that photodetector 11 is received is as evaluation function J=J (v, u), J controls the function of controlling voltage v on voltage u and lithium niobate phase controller list slide on four modulation slides of lithium niobate Polarization Controller, active polarization as shown in Figure 2 and the structured flowchart of phase control module, wherein u
i=(u
i 1, u
i 2, u
i 3, u
i 4), u
i jrepresent i beamlet on Polarization Controller j modulation slide control voltage, v={v
i, v
irepresent i the control voltage on beamlet phase controller list slide, its control flow is:
(a) each control channel is applied to random perturbation δ u simultaneously
i={ δ v
i; δ u
i 1, δ u
i 2, δ u
i 3, δ u
i 4, δ u
ifor adding up independently stochastic variable, and variance is equal, and average is zero, and probability density is about average symmetry, that is:
(b) apply forward disturbance voltage δ u to each passage, obtain evaluation function:
;
(c) apply negative sense disturbance voltage-δ u to each passage, obtain evaluation function:
;
(d) every wheel in iterative process, to one group of stochastic variable { δ u
iapply respectively forward and negative sense disturbance after, obtain the change amount of evaluation function:
(e) can obtain the control voltage of next step iteration according to algorithm:
wherein, γ
nthe relaxation factor that is n step is gain coefficient; Through iteration repeatedly, evaluation function J rapidly converges to maximal value along gradient direction, thereby when realizing fiber array polarization and phase place, controls relevant synthetic output efficiently and stably.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only the specific embodiment of the present invention; the protection domain being not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. the laser array beam combination system based on self-adaptation polarization and phase control, is characterized in that: comprise optical fiber seed resource module, non PM fiber amplification module, close bundle and photodetection module and active polarization and phase control module; Wherein
Optical fiber seed resource module: produce seed light and seed light is divided into multichannel beamlet;
Non PM fiber amplification module: for each beamlet is carried out to power amplification;
Close bundle and photodetection module: for synthetic output that each beamlet after amplifying is concerned with, and the synthetic ring of detecting light beam array encloses light intensity;
Initiatively polarization and phase control module: the synthetic light beam ring that photodetector is detected encloses light intensity, as feedback input signal, and controls phase place and the polarization of fiber amplifier array, makes the phase place between each beamlet consistent with polarization, formation closed-loop control.
2. a kind of laser array beam combination system based on self-adaptation polarization and phase control according to claim 1, is characterized in that: described optical fiber seed resource module comprises: fiber laser (1), produces seed light as optical-fiber laser input end; Optical fiber splitter (2), carries out beam splitting for the seed light that fiber laser (1) is produced, and beam of laser is divided into the beamlet of multichannel.
3. a kind of laser array beam combination system based on self-adaptation polarization and phase control according to claim 1, it is characterized in that: described non PM fiber amplification module, comprise N road non PM fiber amplifier (15), N is positive integer, for carrying out power amplification through each beamlet of active polarization and phase control module.
4. a kind of laser array beam combination system based on self-adaptation polarization and phase control according to claim 1, is characterized in that: the described bundle that closes comprises with photodetection module:
Collimator array (14): for each amplification beamlet is collimated, make the output that is parallel to each other of the direction of each beamlet;
Long focus lens (3): the relevant synthetic light beam of collimator array (14) output is focused on, and export target to;
The first beam splitter (4): the light beam after long focus lens (3) focuses on is first divided into two bundles through the first beam splitter (4) by the light beam after focusing on, transmitted light beam directive target (5), folded light beam is through polarizing beam splitter mirror PBS(6) be divided into vertical polarization component and horizontal polarization component, wherein vertical polarization component ingoing power meter (9), horizontal polarization component enters photodetector (11); Horizontal polarization component enters front attenuator (7), the second beam splitter (8) of also passing through successively of photodetector (11), horizontal polarization component is divided into two bundles by the second beam splitter (8), wherein transmissive portion enters into photodetector (11) through aperture (16), and reflecting part enters into CCD camera (10).
5. according to a kind of laser array beam combination system based on self-adaptation polarization and phase control described in any one in claim 1 to 4, it is characterized in that: described active polarization and phase control module comprise opticator and circuit part, wherein opticator comprises optical fiber waveguide type lithium niobate phase controller (12), the lithium niobate Polarization Controller (13) of each beamlet process, is the performer of light beam phase place and Polarization Control; Circuit part comprises Polarization Control circuit and phase-control circuit, and its ring that photodetector (11) is collected encloses the output of light intensity signal as circuit input signal control lithium niobate phase controller (12) and lithium niobate Polarization Controller (13).
6. a kind of laser array beam combination system based on self-adaptation polarization and phase control according to claim 5, it is characterized in that: described Polarization Control circuit comprises with phase-control circuit the input signal J being connected successively, attenuator circuit, AD9244, 1#FPGA, wherein on 1#FPGA, be connected with time delay DIP device device, three outputs of 1#FPGA are connected to respectively 2#FPGA, 3#FPGA, 4#FPGA, wherein the output of 2#FPGA is divided into two parts: wherein 7 channel signals pass through D/A successively, IV amplifier, ± 5V amplifier output 1-7 passage to optical fiber waveguide type lithium niobate phase controller (12) carries out phase control, other 4 channel signals of 2#FPGA pass through D/A, IV amplifier, ± 30V amplifier output 8-11 passage successively, simultaneously, 12 channel signals of 3#FPGA output pass through successively D/A, IV amplifier, ± 30V amplifier output 12-23 passage, 12 channel signals of 4#FPGA output and pass through successively D/A, IV amplifier, ± 30V amplifier output 24-35 passage, and the acting in conjunction of 8-35 passage is carried out Polarization Control in lithium niobate Polarization Controller (13).
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| CN108123356A (en) * | 2017-12-08 | 2018-06-05 | 中国兵器装备研究院 | A kind of multi-beam array controller for realizing phase delay Polarization Control |
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| CN113054525A (en) * | 2021-03-15 | 2021-06-29 | 中国工程物理研究院流体物理研究所 | Infrared laser coherent synthesis device and synthesis method |
| CN113078549A (en) * | 2021-03-25 | 2021-07-06 | 航天科工微电子系统研究院有限公司 | Direction control method for light beam synthesis on adaptive optical fiber collimator array target |
| CN113394659A (en) * | 2021-05-06 | 2021-09-14 | 光子集成科技香港有限公司 | Light source realized by array semiconductor optical amplifier and optical coupling method |
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| RU2804262C1 (en) * | 2023-05-15 | 2023-09-26 | Федеральное государственное бюджетное учреждение науки Институт оптики атмосферы им. В.Е. Зуева Сибирского отделения Российской академии наук | Method for amplitude, phase and polarization control in phased array of fibre amplifiers and control of distributed state of intensity, wave front and polarization of synthesized beam in the far optical field and device for its implementation |
| CN116773151A (en) * | 2023-08-23 | 2023-09-19 | 四川中久大光科技有限公司 | High-power laser polarization degree testing method and device |
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