CN103346470B - A kind of low-repetition-frequency optical-fiber laser optics coherence tomography system of pulse pump - Google Patents
A kind of low-repetition-frequency optical-fiber laser optics coherence tomography system of pulse pump Download PDFInfo
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Abstract
A kind of low-repetition-frequency optical-fiber laser optics coherence tomography system of pulse pump.This system utilizes continuous wave laser, fiber coupler and intensity modulator to produce pulse laser seeds, and pulse seed is divided into N road after beam splitter, and each road laser is combined into a branch of after multistage pulses pumped fiber laser amplifier amplifies by bundling device.Spectroscope Extraction parts is utilized to synthesize light beam as feedback signal.In the process of detection feedback signal, the light intensity except segment pulse cut by using degree modulator, only retains the continuous signal light between pulse.Simultaneously, phase controller is made only to run phase control algorithm when detector detects continuous signal light, suspend algorithm when amplifier exports pulse to run, thus eliminate the impact of laser pulse light intensity fluctuating on phase control, utilize the phase information comprised in continuous laser to carry out real time correction to phase difference, the optics coherence tomography finally realizing multiplex pulse pumping optical fiber amplifier exports.
Description
Technical field
The present invention relates to the optics coherence tomography of optical-fiber laser, particularly a kind of low-repetition-frequency optical-fiber laser optics coherence tomography system of pulse pump.
Technical background
Fiber laser has the advantages such as conversion efficiency is high, good beam quality, heat management convenience, compact conformation, can obtain the Laser output of high power and high light beam quality.But owing to being subject to the effects such as optical non-linear effect, fire damage, the power output of single-path optical fiber is restricted.In order to meet the requirement of some applications to laser high-output power, general employing is carried out synthesizing the method exported to multi-channel optical fibre laser and is obtained high power optical fibre laser output, common synthetic method mainly contains (the list of references 1:S. J. Augst such as Spectral beam combining, Incoherent beam combining and optics coherence tomography, 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, optics coherence tomography laser array can obtain the high light beam quality of nearly diffraction limit while improving laser output power, it is the study hotspot (list of references 2: Liu Zejin of superlaser technical field, Zhou Piao, Wang little Lin, horse Yan Xing, Xu Xiaojun, Hou Jing. the history of Laser coherent combining, present condition and developing tendency [J]. Chinese laser, 2010,37 (9): 2221-2234).
In optical-fiber laser optics coherence tomography system, (English name is Master Oscillator Power Amplifier to the power amplification of usual employing master oscillator, be called for short MOPA) mode build the fiber laser of multichannel MOPA structure, using lower powered single-frequency laser as seed laser, and power amplification is carried out to it, to meet required power output (amplify as single-stage and still can not meet the demands, the mode that multi-stage cascade amplifies can be adopted).Fiber amplifier is while amplifying seed laser, phase noise can be introduced, the frequency of phase noise kHz magnitude (list of references 3: horse Yan Xing. optical-fiber laser dithering optics coherence tomography technical research [D]. the National University of Defense Technology, 2012).The existence of phase noise makes the effect of optics coherence tomography be had a strong impact on, and is generally from the light intensity fluctuation of synthesis light beam, to extract phase noise information by certain algorithm, and utilizes phase-modulator to carry out real time correction to it.Conventional algorithm 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 phase measurement in fiber laser array optics coherence tomography and bearing calibration are studied [J]. Acta Physica Sinica, 2006, 55(1): 184-187) and dithering (list of references 6: horse Yan Xing, Wang little Lin, Zhou Piao, Deng. many ditherings optics coherence tomography [J] of fiber laser array. light laser and the particle beams, 2010, 22(12): 2806-2806) etc.
For some special applications such as laser radars, need to use pulse laser that repetition rate is tens Hz to hundreds of Hz (list of references 7:E. K. John. Fiber Lasers for Lidar [C]. Optical Fiber Communication Conference andExposition and The National Fiber Optic Engineers Conference, 2005, OFJ4), for the fiber laser that repetition rate is so low, the method of general employing pulse pump (utilize pulse laser but not continuous laser as pumping laser) amplifies (list of references 8:X. Huang to suppress spontaneous radiation, B. Guo, W. Yang, et al. Pulsed-pumped optical fiber amplifier [J]. Chinese Optics Letters, 2009, 7 (8): 712-714).But, current optical-fiber laser optics coherence tomography be all for continuous laser and repetition rate higher than the pulse laser of 10kHz, there is no effective method and optics coherence tomography carried out to the pulse pumped laser of this kind of low-repetition-frequency.The object of this patent is exactly to address this problem, and provides a kind of low-repetition-frequency optical-fiber laser optics coherence tomography system of pulse pump.
Summary of the invention
The object of the present invention is to provide a kind of low-repetition-frequency optical-fiber laser optics coherence tomography system of pulse pump.This system injects certain continuous light between laser pulses as flashlight, utilizes this flashlight to carry out phase control to each road fiber amplifier, and the optics coherence tomography realizing each road laser exports.
Technical solution of the present invention is:
A low-repetition-frequency optical-fiber laser optics coherence tomography system for pulse pump, its feature is, System's composition 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 kind is not limit, and can be electrooptic modulator, also can be acousto-optic modulator or other device.
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 participating in synthesis, and M represents the amplifier progression of each road laser.
Described phase-modulator includes N number of.Described signal of telecommunication delayer includes M.
Described bundling device 8 structure is not limit.
Described photodetector 10 kind is not limit, and can be image device, also can be light intensity detection device or other device.
Described algorithmic controller 11 type is not limit, and can be the device that computer, large scale integrated circuit etc. can perform the control of this algorithm.The algorithm run 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 pulse laser seeds, between the laser pulse of this seed, there is the continuous signal light identical with laser pulse wavelength.Pulse seed is divided into N road after beam splitter 6, and each road laser is combined into a branch of by bundling device 8 after multistage pulses pumped fiber laser amplifier 4 amplifies.In amplification process, laser pulse is amplified, and flashlight is not amplified.Spectroscope 9 Extraction parts is utilized to synthesize light beam as feedback signal.In the process of detection feedback signal, the light intensity except segment pulse cut by using degree modulator, only retains the continuous signal light between pulse.Simultaneously, phase controller is made only to run phase control algorithm when detector detects continuous signal light, suspend algorithm when amplifier exports pulse to run, thus eliminate the impact of laser pulse light intensity fluctuating on phase control, utilize the phase information comprised in continuous laser to carry out real time correction to phase difference.
Adopt the present invention can reach following technique effect:
Add continuous signal light between laser pulses as probe, extract the phase noise of each road pulse laser, to realize the optics coherence tomography of pulse laser of any low-repetition-frequency, Pulse of Arbitrary width, can the fields such as laser radar be applied to.。
Accompanying drawing explanation
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-arm through coupler I 2-1, and wherein an arm inserts an intensity modulator I 3-1 and pulse pump optical fiber laser amplifier 4-0.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 4-0 carries out pre-amplification to laser pulse.Another arm, without any process, is used for phase control as continuous signal light.Two-arm is combined into a branch of as pulse seed laser by another coupler II 2-2, and this seed laser contains laser pulse and the continuous signal light for phase control simultaneously.Seed laser is divided into N to restraint by beam splitter 6, N restraint 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 1st road laser to M level pulse pump optical fiber laser amplifier, and power amplification by that analogy, is carried out to each road laser pulse respectively in all the other each roads.Each road laser is combined into beam of laser and exports by bundling device 8.Beam splitter 9 extracts the laser energy being less than 1% from shoot laser, and irradiation is on intensity modulator II 3-2, and intensity modulator II 3-2 cuts out laser pulse part, only retains continuous signal light.Through the laser irradiation of intensity modulator II 3-2 on photodetector 10, photodetector 10 changes the light signal detected into the signal of telecommunication, is input to algorithmic controller 11 as phase noise feedback signal.Algorithmic controller 11 runs control algolithm according to this feedback signal, produces corresponding control signal, by phase-modulator 7-1,7-2 ..., 7-N corrects the phase noise of each road laser respectively.
Intensity modulator 3, pulse pump optical fiber laser amplifier 4 and algorithmic controller 11 work under the coordination of signal generator 5.Signal generator 5 provides modulation signal for intensity modulator I 3-1, thus produces laser pulse.Signal generator 5 provides modulation signal for intensity modulator II 3-2, cut except laser pulse, only allow continuous signal light between laser pulse by intensity modulator II 3-2, this signal outputs to algorithmic controller 11 after signal of telecommunication delayer I 12-0 time delay, makes algorithmic controller only run control algolithm when receiving continuous signal light.Signal generator 5 provides drive singal for pulse pump optical fiber laser amplifier 4, the pumping source laser pulse of amplifier is made to export pumping laser through amplifier, and by inserting signal of telecommunication delayer 12-1 between amplifier at different levels,, 12-M makes pumping laser and laser pulse synchronous in time domain.
Claims (1)
1. the low-repetition-frequency optical-fiber laser optics coherence tomography system 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, beam splitter, photodetector, algorithmic controller, signal of telecommunication delayer, it is characterized in that, continuous wave laser (1) is divided into two-arm 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), another arm is without any process, phase control is used for as continuous signal light, two-arm is combined into a branch of as pulse seed laser by another coupler II (2-2), seed laser is divided into N to restraint by beam splitter (6), N restraints seed laser and enters phase-modulator (7-1 respectively, 7-N), phase-modulator (7-1,7-N) respectively the phase place of each road laser is regulated, pulse pump optical fiber laser amplifier (4-11 ..., 4-1M) and be respectively the 1st grade of the 1st road laser to M level pulse pump optical fiber laser amplifier, power amplification by that analogy, is carried out to each road laser pulse respectively in all the other each roads, each road laser is combined into beam of laser and exports by bundling device (8), beam splitter (9) extracts the laser energy being less than 1% from shoot laser, and irradiation is in intensity modulator II (3-2), and intensity modulator II (3-2) cuts out laser pulse part, only retains continuous signal light, through the laser irradiation of intensity modulator II (3-2) on photodetector (10), photodetector (10) changes the light signal detected into the signal of telecommunication, algorithmic controller (11) is input to as phase noise feedback signal, algorithmic controller runs control algolithm according to this feedback signal, produce corresponding control signal, by phase-modulator (7-1,7-2,, 7-N) respectively the phase noise of each road laser is corrected,
Described signal generator (5) provides modulation signal for intensity modulator II (3-2), cut except laser pulse, only allow continuous signal light between laser pulse by intensity modulator II (3-2), this signal outputs to algorithmic controller (11) after signal of telecommunication delayer I (12-0) time delay, algorithmic controller is made only to run control algolithm when receiving continuous signal light
Described 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) carries out pre-amplification to laser pulse.
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| CN105762623B (en) * | 2016-05-06 | 2018-11-20 | 中国人民解放军国防科学技术大学 | High power single-frequency pulse full-fiber laser |
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| CN113125120B (en) * | 2021-04-15 | 2022-01-25 | 北京理工大学 | Low-repetition-frequency optical fiber laser coherent synthesis method based on multi-jitter method |
| CN114256728B (en) * | 2021-12-24 | 2024-05-31 | 长春理工大学 | Beam splitting amplifying quasi-continuous optical fiber laser |
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| US7468832B2 (en) * | 2006-10-05 | 2008-12-23 | Northrop Grumman Corporation | Method and system for coherent beam combining using an integrated diffractive beam combiner and sampler |
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