CN103346470A - Low-repetition-frequency fiber laser coherent combination system of pulse pump - Google Patents
Low-repetition-frequency fiber laser coherent combination system of pulse pump Download PDFInfo
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Abstract
Provided is a low-repetition-frequency fiber laser coherent combination system of a pulse pump. According to the system, a continuous laser, an optical fiber coupler and an intensity modulator are used for generating pulse laser seeds, the laser seeds are divided into N branches through a beam splitter, and all branches of laser is amplified through a multi-stage pulse pump optical fiber laser amplifier and then combined into one beam through a beam combiner. Partial combined beams are extracted through a beam splitter mirror and used as feedback signals. In the process of detecting the feedback signals, the intensity modulator is used for eliminating light intensity of a pulse portion, and only continuous signal light among pulses is reserved. Meanwhile, a phase controller operates phase control algorithms only when a detector defects the continuous signal light, and stops the algorithms when the amplifier outputs pulses. Therefore, influences of laser pulse light intensity change on phase control can be removed, phase information contained in continuous lasers is used for real-time correction on phase differences, and finally coherent combination output of the multi-stage pulse pump optical fiber amplifier is achieved.
Description
Technical field
The present invention relates to the relevant synthetic of optical-fiber laser, particularly the relevant synthesis system of a kind of low-repetition-frequency optical-fiber laser of pulse pump.
Technical background
Fiber laser has advantages such as conversion efficiency height, good beam quality, heat management convenience, compact conformation, can obtain the laser output of high power and high light beam quality.Yet owing to influenced by effects such as optical non-linear effect, fire damage, the power output of single channel optical fiber is restricted.In order to satisfy some applications to the requirement of laser high-output power, the general employing synthesized the method acquisition high power optical fibre laser output of exporting to multi-channel optical fibre laser, common synthetic method mainly contains synthetic, incoherent synthetic and relevant (the list of references 1:S. J. Augst such as synthetic of spectrum, J. K. Ranka, T. Y. Fan, A. Sanchez. Beam combining of ytterbium fiber amplifiers (Invited) [J]. J. Opt. Soc. Am. B, 2007,24 (8): 1707-1713).Wherein, relevant synthetic fibre-optical laser array can obtain the high light beam quality of nearly diffraction limit when improving laser output power, it is the research focus (list of references 2: Liu Zejin of superlaser technical field, Zhou Piao, Wang Xiaolin, horse Yan Xing, Xu Xiaojun, Hou Jing. history, current situation and development trend [J] that laser coherence is synthetic. Chinese laser, 2010,37 (9): 2221-2234).
In the relevant synthesis system of optical-fiber laser, usually (English name is Master Oscillator Power Amplifier to adopt the master oscillator power amplification, abbreviation MOPA) mode makes up the fiber laser of multichannel MOPA structure, with lower powered single-frequency laser as seed laser, and it is carried out power amplification, to satisfy needed power output (amplification still can not meet the demands as single-stage, the mode that can adopt multi-stage cascade to amplify).Fiber amplifier can be introduced phase noise when seed laser is amplified, the frequency of phase noise the kHz magnitude (list of references 3: horse Yan Xing. the synthetic technology research [D] that is concerned with of optical-fiber laser dithering. the National University of Defense Technology, 2012).The existence of phase noise is had a strong impact on relevant synthetic effect, generally is to extract phase noise information by certain algorithm from the light intensity fluctuation of synthetic light beam, and utilizes phase-modulator that it is proofreaied and correct in real time.Algorithm commonly used comprises random paralleling gradient descent algorithm (list of references 4:M. A. Vorontsov, V. P. Sivokon. Stochastic parallel-gradient-descent technique for high-resolution wave-front phase-distortion correction[J]. J. Opt. Soc. Am. A, 1998,15 (10): 2745-2758), heterodyne method (list of references 5: Xiao Rui, Hou Jing, Jiang Zongfu. the position during the fiber laser array is relevant synthetic is surveyed and bearing calibration research [J] mutually. Acta Physica Sinica, 2006,55(1): 184-187) and dithering (list of references 6: horse Yan Xing, Wang Xiaolin, Zhou Piao, Deng. many ditherings of fiber laser array relevant synthetic [J]. light laser and the particle beams, 2010,22(12): 2806-2806) etc.
For some special applications such as laser radars, need use repetition rate and be tens Hz to the pulse laser of hundreds of Hz (list of references 7:E. K. John. Fiber Lasers for Lidar[C]. Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference, 2005, OFJ4), for repetition rate low fiber laser like this, the general method that adopts pulse pump (utilize pulse laser but not continuous laser as pumping laser) suppresses spontaneous radiation and amplifies (list of references 8:X. Huang, B. Guo, W. Yang, et al. Pulsed-pumped optical fiber amplifier[J]. Chinese Optics Letters, 2009,7 (8): 712-714).But, at present optical-fiber laser relevant synthetic all be the pulse laser that is higher than 10kHz at continuous laser and repetition rate, still do not have effective method and the pulse pump laser of this class low-repetition-frequency be concerned with synthesizes.The purpose of this patent is exactly in order to address this problem, and a kind of relevant synthesis system of low-repetition-frequency optical-fiber laser of pulse pump is provided.
Summary of the invention
The object of the present invention is to provide a kind of relevant synthesis system of low-repetition-frequency optical-fiber laser of pulse pump.Certain continuous light injects as flashlight in this system between laser pulse, utilize this flashlight that each road fiber amplifier is carried out phase control, realizes the relevant synthetic output of each road laser.
Technical solution of the present invention is:
A kind of low-repetition-frequency optical-fiber laser of pulse pump synthesis system that is concerned with, its characteristics be, system constitutes and comprises: continuous wave laser 1, fiber coupler I 2-1, fiber coupler II 2-2, intensity modulator I 3-1, intensity modulator II 3-2, pulse pump optical fiber laser amplifier 4, signal generator 5, beam splitter 6, phase-modulator 7, bundling device 8, spectroscope 9, photodetector 10, algorithmic controller 11, signal of telecommunication delayer 12.
The splitting ratio of described fiber coupler 2 is not limit, and can adjust according to actual conditions.
Described intensity modulator 3 kinds are not limit, and can be electrooptic modulators, can be acousto-optic modulator or other device yet.
Described pulse pump optical fiber laser amplifier structure is not limit, and includes N*M pulse pump optical fiber laser amplifier.Wherein, N represents the laser way that participates in synthesizing, and M represents the amplifier progression of each road laser.
Described phase-modulator includes N.Described signal of telecommunication delayer includes M.
Described bundling device 8 structures are not limit.
Described photodetector 10 kinds are not limit, and can be image devices, can be light intensity detector spare or other device yet.
Described algorithmic controller 11 types are not limit, and can be the devices that computer, large scale integrated circuit etc. can be carried out this algorithm control.The algorithm that moves is not limit, and can be random paralleling gradient descent algorithm, heterodyne method, dithering or other algorithm.
The course of work of the present invention is:
Utilize continuous wave laser, fiber coupler and intensity modulator to produce the pulse laser seed, have the continuous signal light identical with the laser pulse wavelength between the laser pulse of this seed.Pulse seed is divided into the N road through behind the beam splitter 6, and each road laser amplifies the back through multistage pulses pumping optical fiber laser amplifier 4 and is combined into a branch of by bundling device 8.In amplification process, laser pulse obtains amplifying, and flashlight does not obtain amplifying.Utilize spectroscope 9 extraction units to divide synthetic light beam as feedback signal.In surveying the process of feedback signal, utilize intensity modulator to cut light intensity except segment pulse, only keep the continuous signal light between the pulse.Simultaneously, make phase controller only detect continuous signal light time operation phase control algorithm at detector, when amplifier output pulse, suspend the algorithm operation, rise and fall to the influence of phase control thereby eliminate the laser pulse light intensity, utilize the phase information that comprises in the continuous laser that phase difference is proofreaied and correct in real time.
Adopt the present invention can reach following technique effect:
Between laser pulse, add continuous signal light as probe, extract the phase noise of each road pulse laser, synthesize with the relevant of pulse laser of realizing any low-repetition-frequency, any pulse duration, can be applied to fields such as laser radar.。
Description of drawings
Fig. 1 is system configuration principle schematic of the present invention.
Embodiment
As shown in Figure 1, whole system comprises continuous laser seed source 1, fiber coupler 2, intensity modulator 3, pulse pump optical fiber laser amplifier 4, signal generator 5, beam splitter 6, phase-modulator 7, bundling device 8, spectroscope 9, photodetector 10, algorithmic controller 11, signal of telecommunication delayer 12.
The specific embodiment of the invention is as follows:
Continuous wave laser 1 is divided into two arms through a coupler I 2-1, and wherein an arm inserts an intensity modulator I 3-1 and a pulse pump optical fiber laser amplifier 4-0.The continuous laser of intensity modulator I 3-1 plays the effect of intensity modulated, and for generation of pulse laser, the laser pulse of pulse pump optical fiber laser amplifier 4-0 amplifies in advance.Another arm is used for phase control without any processing as continuous signal light.Two arms are combined into a branch of as pulse seed laser by another coupler II 2-2, this seed laser has comprised laser pulse simultaneously and has been used for the continuous signal light of phase control.Beam splitter 6 is divided into the N bundle with seed laser, N bundle seed laser enter respectively phase-modulator (7-1 ..., 7-N), phase-modulator 7-1,, 7-N regulates the phase place of each road laser respectively, pulse pump optical fiber laser amplifier 4-11,4-1M is respectively the 1st grade of the 1 road laser to M level pulse pump optical fiber laser amplifier, and power amplification is carried out to each road laser pulse respectively by that analogy in all the other each roads.Bundling device 8 is combined into beam of laser output with each road laser.Beam splitter 9 extracts the laser energy less than 1% from shoot laser, irradiation is on intensity modulator II 3-2, and intensity modulator II 3-2 cuts out the laser pulse part, only keeps continuous signal light.The laser irradiation of process intensity modulator II 3-2 is to photodetector 10, and photodetector 10 changes the light signal that detects into the signal of telecommunication, is input to algorithmic controller 11 as the phase noise feedback signal.Algorithmic controller 11 produces corresponding control signal according to this feedback signal operation control algolithm, by phase-modulator 7-1, and 7-2 ..., 7-N proofreaies and correct the phase noise of each road laser respectively.
Intensity modulator 3, pulse pump optical fiber laser amplifier 4 and algorithmic controller 11 are worked under the coordination of signal generator 5.Signal generator 5 provides modulation signal for intensity modulator I 3-1, thereby produces laser pulse.Signal generator 5 provides modulation signal for intensity modulator II 3-2, cut except laser pulse, only allow the continuous signal light between the laser pulse pass through intensity modulator II 3-2, this signal outputs to algorithmic controller 11 after delaying time through signal of telecommunication delayer I 12-0, makes algorithmic controller only receive continuous signal light time operation control algolithm.Signal generator 5 provides the driving signal for pulse pump optical fiber laser amplifier 4, the pumping source laser pulse that makes amplifier is the output pumping laser during through amplifier, and by between amplifiers at different levels, inserting signal of telecommunication delayer 12-1,, 12-M makes pumping laser and laser pulse synchronous on time domain.
Claims (4)
1. the relevant synthesis system of the low-repetition-frequency optical-fiber laser of a pulse pump, comprise: continuous wave laser, fiber coupler, intensity modulator, pulse pump optical fiber laser amplifier, signal generator, beam splitter, phase-modulator, bundling device, spectroscope, photodetector, algorithmic controller, signal of telecommunication delayer is characterized in that, continuous wave laser (1) is divided into two arms through a coupler I (2-1), wherein an arm inserts an intensity modulator I (3-1) and a pulse pump optical fiber laser amplifier I (4-0), and another arm is used for phase control without any processing as continuous signal light; Two arms are combined into a branch of as pulse seed laser by another coupler II (2-2), beam splitter (6) is divided into the N bundle with seed laser, N bundle seed laser enters phase-modulator (7-1 respectively, 7-N), phase-modulator (7-1,7-N) respectively the phase place of each road laser is regulated, the pulse pump optical fiber laser amplifier (4-11 ..., 4-1M) be respectively the 1st grade of the 1 road laser to M level pulse pump optical fiber laser amplifier, power amplification is carried out to each road laser pulse respectively by that analogy in all the other each roads; Bundling device (8) is combined into beam of laser output with each road laser; Beam splitter (9) extracts the laser energy less than 1% from shoot laser, irradiation is on intensity modulator II (3-2), and intensity modulator II (3-2) cuts out the laser pulse part, only keeps continuous signal light; Arrive on the photodetector (10) through the laser irradiation of intensity modulator II (3-2), photodetector (10) changes the light signal that detects into the signal of telecommunication, be input to algorithmic controller (11) as the phase noise feedback signal, algorithmic controller is according to this feedback signal operation control algolithm, produce corresponding control signal, by phase-modulator (7-1,7-2,, 7-N) respectively the phase noise of each road laser is proofreaied and correct.
2. according to the relevant synthesis system of the low-repetition-frequency optical-fiber laser of right 1 described a kind of pulse pump, it is characterized in that, intensity modulator I (3-1) plays the effect of intensity modulated to continuous laser, for generation of pulse laser, pulse pump optical fiber laser amplifier I (4-0) is amplified in advance to laser pulse.
3. according to the relevant synthesis system of the low-repetition-frequency optical-fiber laser of right 1 described a kind of pulse pump, it is characterized in that described seed laser has comprised laser pulse simultaneously and has been used for the continuous signal light of phase control.
4. according to the relevant synthesis system of the low-repetition-frequency optical-fiber laser of right 1 described a kind of pulse pump, it is characterized in that, intensity modulator (3), pulse pump optical fiber laser amplifier and algorithmic controller (11) are worked under the coordination of signal generator (5), signal generator (5) provides modulation signal for intensity modulator I (3-1), thereby generation laser pulse, signal generator (5) provides modulation signal for intensity modulator II (3-2), cut except laser pulse, only allow the continuous signal light between the laser pulse pass through intensity modulator II (3-2), this signal outputs to algorithmic controller (11) after delaying time through signal of telecommunication delayer I (12-0), make algorithmic controller only receive continuous signal light time operation control algolithm, signal generator (5) provides the driving signal for hard pulse pumping optical fiber laser amplifier, the pumping source laser pulse that makes amplifier is the output pumping laser during through amplifier, and by between amplifiers at different levels, inserting signal of telecommunication delayer (12-1,, 12-M) make pumping laser and laser pulse synchronous on time domain.
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| CN103944641A (en) * | 2014-04-21 | 2014-07-23 | 长春理工大学 | High-power fiber laser phased array high-speed information transmitting device capable of being dynamically connected |
| CN104934845A (en) * | 2015-06-04 | 2015-09-23 | 中国工程物理研究院流体物理研究所 | Optical parameter oscillator array coherent beam combination system and active control method |
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