CN112202040B - Laser array piston phase control method - Google Patents

Laser array piston phase control method Download PDF

Info

Publication number
CN112202040B
CN112202040B CN202011084859.7A CN202011084859A CN112202040B CN 112202040 B CN112202040 B CN 112202040B CN 202011084859 A CN202011084859 A CN 202011084859A CN 112202040 B CN112202040 B CN 112202040B
Authority
CN
China
Prior art keywords
sub
laser
phase
path
phase modulator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202011084859.7A
Other languages
Chinese (zh)
Other versions
CN112202040A (en
Inventor
周朴
常洪祥
马鹏飞
粟荣涛
马阎星
吴坚
李�灿
刘伟
姜曼
常琦
侯天悦
张雨秋
王涛
张嵩
司磊
许晓军
陈金宝
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
National University of Defense Technology
Original Assignee
National University of Defense Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by National University of Defense Technology filed Critical National University of Defense Technology
Priority to CN202011084859.7A priority Critical patent/CN112202040B/en
Publication of CN112202040A publication Critical patent/CN112202040A/en
Application granted granted Critical
Publication of CN112202040B publication Critical patent/CN112202040B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • 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
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10053—Phase control
    • 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
    • H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

The invention provides a laser array piston phase control method which comprises a laser array piston phase control system, wherein the laser array piston phase control system comprises a seed source laser, a beam splitter, a phase modulator, an optical fiber laser amplification system, a beam combining collimator, a sampling reflector, a focusing lens, a photoelectric detector and a phase controller, and in the laser array piston phase control system, the phase controller is used for controlling the control voltage of the phase modulator in each path of sub-laser transmission path in a laser array so as to regulate and control the piston phase of each path of sub-laser. The invention can realize the phase control of laser arrays with more paths on the basis of reducing the difficulty of hardware development.

Description

Laser array piston phase control method
Technical Field
The invention belongs to the technical field of fiber laser, and particularly relates to a laser array piston phase control method.
Background
The high-power optical fiber laser has strong application requirements in the fields of material welding, cutting and the like. Coherent combining of multiple laser beams is one of the effective means for obtaining high power laser beams. In the scheme, a main oscillation power amplifier structure is generally adopted, the seed laser is split into a plurality of sub-laser beams, and each path of laser is amplified respectively and then combined by a beam combining device. One of the key technologies for realizing coherent synthesis is to control the piston phase of each laser, so that the phase difference between each laser is as small as possible, and a stable and efficient far-field synthesis effect is obtained. The method comprises the steps of applying small-amplitude high-frequency sinusoidal modulation with different frequencies to each path of laser, collecting partial far-field light spot energy by using a pinhole, and performing related demodulation to obtain phase information of each path for correcting phase difference among the paths. Along with the increase of the number of paths for coherent synthesis laser, the frequency number of high-frequency sinusoidal signals for modulation is increased, the difficulty of manufacturing a control circuit by using an analog circuit is increased, and if a digital circuit is used for generating sinusoidal modulation signals, the frequency of the modulation signals which can be used is limited by the number of sampling points and the clock of a digital circuit system.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a laser array piston phase control method. In the invention, bipolar square wave signals with different frequencies are adopted to carry out phase modulation on each path of laser, and then phase difference correction is carried out. Through the technical scheme, the development difficulty of the phase control circuit can be reduced, the number of the synthetic paths is increased on the premise of ensuring the control bandwidth, and the method has important significance for further improving the actual operation of the coherent synthetic path number.
In order to achieve the technical purpose, the invention adopts the following specific technical scheme:
in a laser array piston phase control system, a phase controller controls the control voltage of a phase modulator in each path of sub-laser transmission path in a laser array so as to regulate and control the piston phase of each path of sub-laser, the control voltage of the phase modulator in each path of sub-laser transmission path is the sum of the phase control bias voltage of the phase modulator in each path of sub-laser transmission path and a modulation signal corresponding to each path of sub-laser, and the modulation signal of each path of sub-laser is a bipolar square wave signal with different frequencies.
As a preferred scheme of the invention, the laser array piston phase control system comprises a seed source laser, a beam splitter, a phase modulator, an optical fiber laser amplification system, a beam combination collimator, a sampling reflector, a focusing lens, a photoelectric detector and a phase controller, wherein the output end of the seed source laser is connected with the beam splitter, the optical fiber laser output by the seed source laser is equally divided into n beams of sub-lasers, the phase modulator and the optical fiber laser amplification system are sequentially arranged on a sub-laser transmission path corresponding to each sub-laser, each sub-laser is amplified by the optical fiber laser amplification system and then collimated and output to the sampling reflector by the beam combination collimator, a small part of sampling light beam output by the sampling reflector is incident to the photoelectric detector through the focusing lens, the photoelectric detector converts the acquired optical signal into an electrical signal and outputs the electrical signal to the phase controller, the electrical signal is processed to obtain control voltage of the phase modulator in each sub-laser transmission path of the phase controller, and then the control voltage of the phase modulator in each sub-laser transmission path of the phase controller is applied And the phase modulator is connected with the corresponding phase modulator, so that the piston phase of each path of sub laser is regulated and controlled. Preferably, wherein the seed source laser is a low power narrow linewidth fiber laser.
As a preferred scheme of the present invention, the phase controller comprises a data acquisition module, a data processing module and a data output module, wherein the data acquisition module performs noise filtering and signal scaling on the received electrical signal and then transmits the electrical signal to the data processing module; the data processing module receives the electric signal provided by the data acquisition module, carries out relevant demodulation on the electric signal to obtain the phase control bias voltage of the phase modulator in each path of sub-laser transmission path, and simultaneously generates n modulation signals, wherein each modulation signal corresponds to one path of sub-laser respectively; and the data output module outputs the control voltage of the phase modulator in each path of sub laser transmission path and applies the control voltage to the corresponding phase modulator.
As a preferred embodiment of the present invention, the n modulation signals are n orthogonal bipolar square wave signals with different frequencies and an amplitude β.
As a preferable aspect of the present invention, a method for generating a control voltage of a phase modulator in each sub-laser transmission path by the phase controller according to the present invention includes:
(1) presetting a system operation clock, wherein the system operation clock is the minimum time unit of a modulation signal; setting the integration time tau of the correlation demodulation; setting initial phase control bias voltage u of phase modulator in each sub-laser transmission path0(i)I ═ 1,2, …, n; setting a fixed step length delta u of the change of the phase control bias voltage; setting n modulation signals f (T)iT), modulation signal f (T)iT) is expressed as
Figure GDA0003301706960000031
In the formula TiFor modulating the signal period, TiIs an integral multiple of the system running clock, t is time, and a is the number of cycles. Ith modulation signal f (T)iT) corresponding to the ith path of sub-laser, n modulation signals are n bipolar square wave signals with different frequencies and amplitude beta;
(2) the initial control voltage applied to the phase modulator in each sub-laser transmission path is an initial phase control bias voltage u0(i)And bipolar square wave modulation signal beta.f (T)iT) sum of u0(i)+β·f(Ti,t)；
(3) The photoelectric detector detects the light intensity change of the target surface light spot center, the photoelectric detector converts the acquired optical signal into an electric signal and outputs the electric signal to the data acquisition module, and the data acquisition module performs noise filtering and signal scaling on the received electric signal and then transmits the electric signal to the data processing module;
(4) the data processing module calculates phase error signals of the sub-lasers, wherein the photoelectric detector outputs a light intensity change electric signal i to the data processing modulePD(T) and a bipolar square wave modulation signal beta.f (T) of each path of sub-laseriT) are multiplied respectively, and phase error signals of each path are obtained through tau time integration
Figure GDA0003301706960000041
Where k is the coefficient, Pj0Is the optical power of the jth sub-laser, phiiAnd phijThe phases of the ith path of sub laser and the jth path of sub laser are obtained;
(5) determining the control voltage applied to the phase modulator in each path of sub-laser transmission path next time and then applying the control voltage to the corresponding phase modulator; the method for determining the final control voltage of the phase modulator in each path of sub-laser transmission path comprises the following steps:
get SiThe sign of (A) is the direction of change of the phase-controlled bias voltage, SiWhen the voltage is negative, the phase control offset voltage of the phase modulator in the i-th sub-laser transmission path of the next time is decreased by Δ u on the basis of the phase control offset voltage of the phase modulator in the i-th sub-laser transmission path of the previous time, otherwise, the phase control offset voltage of the phase modulator in the i-th sub-laser transmission path of the next time is increased by Δ u on the basis of the phase control offset voltage of the phase modulator in the i-th sub-laser transmission path of the previous time.
Calculating the control voltage applied to the phase modulator in the ith sub-laser transmission path next time as the phase control bias voltage of the phase modulator in the ith sub-laser transmission path next time and the bipolar square wave modulation signal beta·f(TiAnd t) is added.
If the calculated value of the control voltage applied to the phase modulator in each path of sub-laser transmission path next time is within the output range of the data output module, the final control voltage applied to the phase modulator in each path of sub-laser transmission path next time is the calculated control voltage applied to the phase modulator in each path of sub-laser transmission path next time; if the calculated value of the control voltage applied to the phase modulator in each path of sub-laser transmission path next time is lower than the minimum value of the output range of the data output module, the final control voltage applied to the phase modulator in each path of sub-laser transmission path next time is increased by two half-wave voltages V of the phase modulator on the basis of the calculated control voltage applied to the phase modulator in each path of sub-laser transmission path next time0(ii) a If the calculated value of the control voltage applied to the phase modulator in each sub laser transmission path next time is higher than the maximum value of the output range of the data output module, the final control voltage applied to the phase modulator in each sub laser transmission path next time is to reduce two half-wave voltages V of the phase modulator on the basis of the calculated control voltage applied to the phase modulator in each sub laser transmission path next time0。
(6) And (5) repeating the steps (3) to (5) to continuously compensate the dynamic phase error.
The invention has the following beneficial effects:
1. the invention provides a laser array piston phase control method which is different from the traditional laser array piston phase control method. Specifically, the invention applies bipolar square wave modulation signals with different frequencies to the phase of each path of sub-laser, and demodulates the phase difference between the path of sub-laser and other paths of sub-laser through relevant demodulation. Through the technical scheme, the development difficulty of the phase control circuit can be reduced, the number of the synthetic paths is increased on the premise of ensuring the control bandwidth, and the method has important significance for further improving the actual operation of the coherent synthetic path number.
2. Compared with the existing multi-jitter method, the method can realize coherent synthesis of more paths under the same hardware condition.
In conclusion, the method has important application value in the field of laser coherent synthesis.
Drawings
FIG. 1 is a schematic diagram of a system architecture according to an embodiment.
FIG. 2 is a diagram of the effect of control in one embodiment.
Detailed Description
In order to make the technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the present embodiment, in a laser array piston phase control system, a phase controller controls a control voltage of a phase modulator in each sub-laser transmission path in a laser array to further regulate and control a piston phase of each sub-laser, the control voltage of the phase modulator in each sub-laser transmission path is a sum of a phase control offset voltage of the phase modulator in each sub-laser transmission path and a modulation signal corresponding to each sub-laser, and the modulation signal of each sub-laser is a bipolar square wave signal with different frequencies.
Referring to fig. 1, the laser array piston phase control system in this embodiment includes a low-power narrow linewidth fiber laser 1, a beam splitter 2, a phase modulator 3, a fiber laser amplification system 4, a beam combining collimator 5, a sampling mirror 6, a focusing lens 7, a photodetector with a pinhole 8, and a phase controller 9.
The fiber laser output from the low-power narrow-linewidth fiber laser 1 is firstly incident to a beam splitter 2; the laser passing through the beam splitter 2 is accessed into the phase modulator 3 and then injected into the fiber laser amplification system 4 for power amplification; the laser amplified by the fiber laser amplification system 4 is output in a collimating way by the beam-combining collimator 5. The light beam output by the beam combiner 5 is collimated, a small part of a reflected light beam passes through a sampling reflector 6, enters a photoelectric detector 8 with a pinhole through a focusing lens 7, and a transmitted light beam is emitted into free space. The data acquisition module 9-1 in the phase controller 9 receives the electrical signal output by the photoelectric detector 8, and transmits the electrical signal to the data processing module 9-2 after noise filtering and signal scaling. The data processing module 9-2 receives the electrical signal provided by the data acquisition module 9-1, processes the electrical signal to obtain a phase bias voltage, and generates a bipolar square wave modulation signal of each path. The data output module 9-3 adds the phase bias voltage obtained by the data processing module 9-2 and the bipolar square wave modulation signal and applies the result to the phase modulator controller 3.
In this embodiment, the beam splitter equally divides the fiber laser output by the seed source laser into 4 sub-beams, so that the data processing module generates 4 modulation signals f (T)1,t)，f(T2,t)，f(T3,t)，f(T4T), modulation signal f (T)iT) is expressed as
Figure GDA0003301706960000071
T1、T2、T3、T4Four periods of square wave modulation, T is time, a is period number, modulation signal f (T)1,t)，f(T2,t)，f(T3,t)，f(T4And t) respectively correspond to the 1 st, 2 nd, 3 th and 4 th sub-lasers. The method for generating the control voltage of the phase modulator in each path of sub-laser transmission path comprises the following steps:
(1) presetting a system operation clock; setting the integration time tau of the correlation demodulation; setting initial phase control bias voltage u of phase modulator in each sub-laser transmission path 0(i)0, i-1, 2,3, 4; setting a fixed step length delta u of the change of the phase control bias voltage; setting 4 modulation signals f (T)1,t)，f(T2,t)，f(T3,t)，f(T4T), modulation signal f (T)1,t)，f(T2,t)，f(T3,t)，f(T4T) respectively corresponding to the 1 st, 2 nd, 3 th and 4 th sub-lasers, wherein the n modulation signals are n bipolar square wave signals with different frequencies and amplitude beta; half-wave voltage of each phase modulator is V0。
(2) The initial control voltage applied to the phase modulator in each sub-laser transmission path by the data output module is u0(i)+β·f(Ti,t)；
(3) The photoelectric detector detects the light intensity change of the target surface light spot center, the photoelectric detector converts the acquired optical signal into an electric signal and outputs the electric signal to the data acquisition module, and the data acquisition module performs noise filtering and signal scaling on the received electric signal and then transmits the electric signal to the data processing module;
(4) the data processing module calculates phase error signals of the sub-lasers, wherein the photoelectric detector outputs a light intensity change electric signal i to the data processing modulePD(T) and a bipolar square wave modulation signal beta.f (T) of each path of sub-laseriT) are multiplied respectively, phase error signals of each path are obtained through tau time integration,
Figure GDA0003301706960000081
wherein iPDIs the output of the light spot detector, k is the coefficient, Pj0Is the optical power of the j path sub laser beamiPhi-jThe phases of the ith path of sub laser and the jth path of sub laser are obtained;
(5) and the data processing module updates the phase control bias voltage of the phase modulator in each path of sub-laser transmission path according to the phase error signal, determines the final control voltage applied to the phase modulator in each path of sub-laser transmission path next time, and applies the final control voltage to the corresponding phase modulator.
The method for determining the final control voltage of the phase modulator in each path of sub-laser transmission path comprises the following steps:
get SiThe sign of (A) is the direction of change of the phase-controlled bias voltage, SiWhen the voltage is negative, the phase control bias voltage of the phase modulator in the next i-th path of sub-laser transmission path is reduced by delta u on the basis of the phase control bias voltage of the phase modulator in the previous i-th path of sub-laser transmission path, otherwise, the phase control bias voltage of the phase modulator in the next i-th path of sub-laser transmission path is reduced by delta uThe set voltage is increased by delta u on the basis of the phase control bias voltage of the phase modulator in the ith sub-laser transmission path at the last time.
Calculating the control voltage applied to the phase modulator in the ith sub-laser transmission path next time as the phase control bias voltage of the phase modulator in the ith sub-laser transmission path next time and the bipolar square wave modulation signal beta.f (T)iT) sum of;
if the calculated value of the control voltage applied to the phase modulator in each path of sub-laser transmission path next time is within the output range of the data output module, the final control voltage applied to the phase modulator in each path of sub-laser transmission path next time is the calculated control voltage applied to the phase modulator in each path of sub-laser transmission path next time; if the calculated value of the control voltage applied to the phase modulator in each path of sub-laser transmission path next time is lower than the minimum value of the output range of the data output module, the final control voltage applied to the phase modulator in each path of sub-laser transmission path next time is increased by two half-wave voltages V of the phase modulator on the basis of the calculated control voltage applied to the phase modulator in each path of sub-laser transmission path next time0(ii) a If the calculated value of the control voltage applied to the phase modulator in each sub laser transmission path next time is higher than the maximum value of the output range of the data output module, the final control voltage applied to the phase modulator in each sub laser transmission path next time is to reduce two half-wave voltages V of the phase modulator on the basis of the calculated control voltage applied to the phase modulator in each sub laser transmission path next time0. This keeps the control voltage output within the control range of the output module. (6) And (5) repeating the steps (3) to (5) to continuously compensate the dynamic phase error.
To further illustrate the advantages of the new method, without loss of generality, the initial values are set in one embodiment of the invention as follows: running clock 100MHz, T1＝0.01us，T2＝0.02us，T3＝0.03us，T40.04us, modulation amplitude beta 2V0λ x λ/60, integration time τ0.12us, and a voltage change step Δ u of 2V0A/λ x λ/60, phase modulator half-wave voltage V02.5V. The control performance results are shown in figure 2. It can be seen in fig. 2 that the normalized light intensity in the pinhole is raised from 0.4 to approximately 1 in 20 left and right iterations. In this example, the single phase correction time is 20 × τ ≈ 2.4 us.
In summary, although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims (4)

1. A laser array piston phase control method is characterized in that in a laser array piston phase control system, a phase controller controls control voltage of a phase modulator in each path of sub-laser transmission path in a laser array so as to regulate and control piston phase of each path of sub-laser, the control voltage of the phase modulator in each path of sub-laser transmission path is the sum of phase control bias voltage of the phase modulator in each path of sub-laser transmission path and modulation signals corresponding to each path of sub-laser, the modulation signals of each path of sub-laser are bipolar square wave signals with different frequencies, wherein the laser array piston phase control system comprises a seed source laser, a beam splitter, a phase modulator, an optical fiber laser amplification system, a beam combining collimator, a sampling reflector, a focusing lens, a photoelectric detector and a phase controller, the output end of the seed source laser is connected with the beam splitter, equally dividing the optical fiber laser output by the seed source laser into n sub-laser beams, arranging a phase modulator and an optical fiber laser amplifying system on the sub-laser transmission path corresponding to each sub-laser beam in sequence, amplifying each sub-laser beam by the optical fiber laser amplifying system, collimating and outputting the sub-laser beam to a sampling reflector by a beam-combining collimator, emitting a small part of the sampling beam output by the sampling reflector to a photoelectric detector by a focusing lens, converting the collected optical signal into an electric signal by the photoelectric detector and outputting the electric signal to a phase controller, processing the electric signal by the phase controller to obtain the control voltage of the phase modulator in each sub-laser transmission path and then applying the control voltage to the corresponding phase modulator, the phase controller comprises a data acquisition module, a data processing module and a data output module, wherein the data acquisition module carries out noise filtering and signal scaling on the received electric signals and then transmits the electric signals to the data processing module; the data processing module receives the electric signal provided by the data acquisition module, carries out relevant demodulation on the electric signal to obtain the phase control bias voltage of the phase modulator in each path of sub-laser transmission path, and simultaneously generates n modulation signals, wherein each modulation signal corresponds to one path of sub-laser respectively; the data output module outputs the control voltage of the phase modulator in each path of sub-laser transmission path and applies the control voltage to the corresponding phase modulator; the method for generating the control voltage of the phase modulator in each path of sub laser transmission path by the phase controller comprises the following steps:
(1) presetting a system operation clock; setting the integration time tau of the correlation demodulation; setting initial phase control bias voltage u of phase modulator in each sub-laser transmission path0(i)I ═ 1,2, …, n; setting a fixed step length delta u of the change of the phase control bias voltage; setting n modulation signals f (T)i,t)，TiFor the modulation signal period, T is time, the ith modulation signal f (T)iT) corresponding to the ith path of sub-laser, n modulation signals are n bipolar square wave signals with different frequencies and amplitude beta;
(2) the initial control voltage applied to the phase modulator in each sub-laser transmission path is an initial phase control bias voltage u0(i)And bipolar square wave modulation signal beta.f (T)iT) sum of u0(i)+β·f(Ti,t)；
(3) The photoelectric detector detects the light intensity change of the target surface light spot center, the photoelectric detector converts the acquired optical signal into an electric signal and outputs the electric signal to the data acquisition module, and the data acquisition module carries out noise filtering and signal scaling on the received electric signal and then transmits the electric signal to the data processing module;
(4) the data processing module calculates phase error signals of the sub-lasers, wherein the light intensity variation output by the photoelectric detector to the data processing moduleNumber iPD(T) and a bipolar square wave modulation signal beta.f (T) of each path of sub-laseriT) are multiplied respectively, and phase error signals of all paths are obtained through tau time integration:
Figure FDA0003301706950000021
where k is the coefficient, Pj0Is the optical power of the jth sub-laser, phiiAnd phijThe phases of the ith path of sub laser and the jth path of sub laser are obtained;
(5) and determining the final control voltage applied to the phase modulator in each path of sub-laser transmission path next time, and then applying the final control voltage to the corresponding phase modulator, wherein the determination method of the final control voltage of the phase modulator in each path of sub-laser transmission path is as follows:
get SiThe sign of (A) is the direction of change of the phase-controlled bias voltage, SiWhen the voltage is negative, the phase control bias voltage of the phase modulator in the ith sub-laser transmission path for the next time is decreased by delta u on the basis of the phase control bias voltage of the phase modulator in the ith sub-laser transmission path for the last time, otherwise, the phase control bias voltage of the phase modulator in the ith sub-laser transmission path for the next time is increased by delta u on the basis of the phase control bias voltage of the phase modulator in the ith sub-laser transmission path for the last time;
calculating the control voltage applied to the phase modulator in the ith sub-laser transmission path next time as the phase control bias voltage of the phase modulator in the ith sub-laser transmission path next time and the bipolar square wave modulation signal beta.f (T)iT) sum of;
if the calculated value of the control voltage applied to the phase modulator in each path of sub-laser transmission path next time is within the output range of the data output module, the final control voltage applied to the phase modulator in each path of sub-laser transmission path next time is the calculated control voltage applied to the phase modulator in each path of sub-laser transmission path next time; if the calculated next time is applied to each sub-laser transmission pathIf the value of the control voltage of the bit modulator is lower than the minimum value of the output range of the data output module, the final control voltage applied to the phase modulator in each path of sub-laser transmission path next time is increased by two half-wave voltages V of the phase modulator on the basis of the calculated control voltage applied to the phase modulator in each path of sub-laser transmission path next time0(ii) a If the calculated value of the control voltage applied to the phase modulator in each sub laser transmission path next time is higher than the maximum value of the output range of the data output module, the final control voltage applied to the phase modulator in each sub laser transmission path next time is to reduce two half-wave voltages V of the phase modulator on the basis of the calculated control voltage applied to the phase modulator in each sub laser transmission path next time0；
(6) And (5) repeating the steps (3) to (5) to continuously compensate the dynamic phase error.
2. The laser array piston phase control method of claim 1 wherein the seed source laser is a low power narrow linewidth fiber laser.
3. The method for controlling the piston phase of a laser array according to claim 1, wherein said n modulation signals are n orthogonal bipolar square wave signals with different frequencies and amplitude β.
4. The method of claim 1, wherein the modulation signal f (T) is a modulation signaliT) is expressed as
Figure FDA0003301706950000041
In the formula TiIs an integer multiple of the system running clock, and a is the number of cycles.
CN202011084859.7A 2020-10-12 2020-10-12 Laser array piston phase control method Active CN112202040B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011084859.7A CN112202040B (en) 2020-10-12 2020-10-12 Laser array piston phase control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011084859.7A CN112202040B (en) 2020-10-12 2020-10-12 Laser array piston phase control method

Publications (2)

Publication Number Publication Date
CN112202040A CN112202040A (en) 2021-01-08
CN112202040B true CN112202040B (en) 2021-12-03

Family

ID=74012859

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011084859.7A Active CN112202040B (en) 2020-10-12 2020-10-12 Laser array piston phase control method

Country Status (1)

Country Link
CN (1) CN112202040B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114006247B (en) * 2021-11-03 2023-05-05 中国人民解放军国防科技大学 Phase control system and method based on time-frequency multi-domain information

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103346470A (en) * 2013-06-06 2013-10-09 中国人民解放军国防科学技术大学 Low-repetition-frequency fiber laser coherent combination system of pulse pump
CN106451055A (en) * 2016-12-02 2017-02-22 中国人民解放军国防科学技术大学 Phase control method and control circuit used for large array element coherent combination
CN107894585A (en) * 2017-10-31 2018-04-10 中国人民解放军国防科技大学 Multi-decoy generation method based on phase modulation surface
CN108828535A (en) * 2018-04-12 2018-11-16 中国人民解放军国防科技大学 Radar target characteristic transformation method based on phase modulation surface
CN111564751A (en) * 2020-05-18 2020-08-21 中国人民解放军国防科技大学 High-power narrow-linewidth optical fiber laser polarization control system and method
CN111725696A (en) * 2020-06-16 2020-09-29 中国人民解放军国防科技大学 Piston phase regulation and control system and method of laser coherent array

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL206143A (en) * 2010-06-02 2016-06-30 Eyal Shekel Coherent optical amplifier

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103346470A (en) * 2013-06-06 2013-10-09 中国人民解放军国防科学技术大学 Low-repetition-frequency fiber laser coherent combination system of pulse pump
CN106451055A (en) * 2016-12-02 2017-02-22 中国人民解放军国防科学技术大学 Phase control method and control circuit used for large array element coherent combination
CN107894585A (en) * 2017-10-31 2018-04-10 中国人民解放军国防科技大学 Multi-decoy generation method based on phase modulation surface
CN108828535A (en) * 2018-04-12 2018-11-16 中国人民解放军国防科技大学 Radar target characteristic transformation method based on phase modulation surface
CN111564751A (en) * 2020-05-18 2020-08-21 中国人民解放军国防科技大学 High-power narrow-linewidth optical fiber laser polarization control system and method
CN111725696A (en) * 2020-06-16 2020-09-29 中国人民解放军国防科技大学 Piston phase regulation and control system and method of laser coherent array

Also Published As

Publication number Publication date
CN112202040A (en) 2021-01-08

Similar Documents

Publication Publication Date Title
CN102629731B (en) Control method for simultaneously stabilizing laser wavelength and power and control device thereof
CN108196244B (en) Optical fiber array phased array deflection transmitting system based on SPGD algorithm
US7884997B2 (en) System and method for coherent beam combination
CN111725696B (en) Piston phase regulation and control system and method of laser coherent array
CN108110612B (en) Modulation-free frequency stabilization method and device based on Mach-Zehnder interferometer
JP2000323774A (en) Improvfd high-speed average-power fiber laser system having high-speed parallel wavefront sensor
CN112198668B (en) Optical field reconstruction system and method for generating vortex light beam by coherent synthesis of fiber laser
CN112202040B (en) Laser array piston phase control method
CN104216123A (en) Fiber laser array group beam system based on self-adaptation polarization and phase control
US8503070B1 (en) Fiber active path length synchronization
CN113566983B (en) Laser coherent array distributed phase control system and control method
CN103227408B (en) Based on beam array phase control system and the method for leggy disturbance
CN112039523B (en) Rubidium two-photon transition optical frequency scale based on polarization modulation
JPH01276786A (en) Method and apparatus for automatic frequency control of semiconductor laser
CN114336277B (en) Large-detuning frequency stabilizing device and method for laser with EOM sideband modulation
US11588556B1 (en) High bandwidth individual channel control via optical reference interferometry control system architecture
CN112803228B (en) Vortex light beam generation method based on spiral line arrangement phase-locked fiber laser array
CN115164741A (en) Distance measuring system based on vector light field
JP6956919B2 (en) Optical modulation controller and Mach-Zehnder interferometer
CN115102031A (en) Device and method for adjusting output frequency of laser based on atomic transition
CN1226655C (en) Phase compensation method and device for raising super-diffraction limit of laser beam energy density
CN110220509B (en) Hybrid integrated narrow linewidth laser system for high-precision fiber-optic gyroscope
CN108808436B (en) Multi-beam common-aperture coherent synthesis device based on flat-plate beam combiner
CN114967407B (en) Integrated optical system for small optical pumping beam type atomic clock
CN114006247B (en) Phase control system and method based on time-frequency multi-domain information

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant