CN115566519B - High-power high-beam-quality narrow-linewidth optical fiber laser amplification system - Google Patents
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
- H01S3/06758—Tandem amplifiers
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- 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
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10015—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by monitoring or controlling, e.g. attenuating, the input signal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10053—Phase control
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10061—Polarization control
Abstract
The invention provides a high-power high-beam-quality narrow-linewidth optical fiber laser amplification system which comprises a linear polarization single-frequency optical fiber laser seed source, a phase modulation component, a polarization controller, an optical fiber laser preamplifier, an annular isolator, an optical fiber laser main amplifier, an optical fiber collimation end cap, a power meter, a first photoelectric detector, a polarization control component, a high-reflection mirror and a second photoelectric detector, wherein the linear polarization single-frequency optical fiber laser seed source is connected with the polarization controller; the linear polarization single-frequency fiber laser output by the linear polarization single-frequency fiber laser seed source sequentially passes through the phase modulation assembly, the polarization controller, the fiber laser preamplifier, the annular isolator and the fiber laser main amplifier, then outputs high-power laser through the fiber collimation end cap, power monitoring is carried out by the power meter, the third port of the annular isolator and transmission light of the high-reflection mirror are respectively connected with the first photoelectric detector and the second photoelectric detector, the monitoring signals all enter the polarization control assembly, control signals are obtained through an optimization algorithm, and polarization control is carried out by the polarization controller.
Description
Technical Field
The invention relates to the technical field of fiber laser, in particular to a high-power high-beam-quality narrow-linewidth fiber laser amplification system.
Background
The high-power narrow-linewidth optical fiber laser has important application in the fields of beam synthesis, coherent radar, nonlinear frequency conversion and the like, and the stimulated Brillouin scattering effect (SBS) and the mode instability effect (MI) are main limiting factors for further improving the power of the high-power narrow-linewidth optical fiber laser. The stimulated Brillouin scattering threshold value can be improved by increasing the effective mode field area of the optical fiber, reducing the effective length of the optical fiber and reducing the gain coefficient of the Brillouin scattering; the suppression idea of the mode instability MI effect is mainly to increase the high-order mode loss through bending mode selection, low-NA optical fibers, reducing the core diameter and designing special optical fibers or to reduce the heat accumulation through reducing the core-cladding ratio, pumping in the same band and the like. However, both stimulated brillouin scattering and mode instability cannot be suppressed simultaneously with the above-described single mode.
The stimulated brillouin scattering is due to excitation of backward stokes light after transmission of high-intensity signal light, interference of the backward stokes light with forward signal light and generation of acoustic waves, and further excitation of exponential growth of the backward transmitted stokes light by an acoustic wave field. It can be seen that the stimulated brillouin scattering effect is closely related to the polarization direction of the laser light in the amplifier. The brillouin gain is maximum when the signal light (i.e., the pump light of the stimulated brillouin scattering) and the stokes light are in the same polarization state; when the signal light (i.e., the pump light of the stimulated brillouin scattering) and the stokes light are orthogonally linearly polarized, the brillouin gain is zero. Therefore, the stimulated brillouin scattering effect of the polarization maintaining system is strongest. In the non-polarization system, due to birefringence fluctuation in the optical fiber, the polarization states of the signal light and the stokes light are randomly changed, and theoretically, the polarization state of the signal light in the ordinary non-polarization optical fiber becomes completely disordered due to the birefringence fluctuation, and the stimulated brillouin scattering threshold value is increased by 50% compared with the polarization maintaining optical fiber. In the prior art, a system for suppressing mode instability in a high-power fiber laser is proposed in a patent document with publication number CN108512028a, and in the technical scheme, the high-order mode proportion injected and transmitted along the longitudinal direction of a gain fiber of a high-power fiber laser amplifier is reduced by changing the polarization state of a seed source, so as to achieve the purpose of suppressing the mode instability phenomenon. However, the above system can suppress only the MI effect, and still cannot achieve output of high spectral density laser light under the influence of the SBS effect.
In view of the above, there is a need to design an improved high power, high beam quality and narrow linewidth fiber laser amplification system to solve the above problems.
Disclosure of Invention
The invention aims to provide a high-power high-beam-quality narrow-linewidth optical fiber laser amplification system.
In order to achieve the purpose, the invention provides a high-power high-beam-quality narrow-linewidth fiber laser amplification system, which comprises a linear polarization single-frequency fiber laser seed source, a phase modulation component, a polarization controller, a fiber laser preamplifier, an annular isolator, a fiber laser main amplifier, a fiber collimation end cap, a power meter, a first photoelectric detector, a polarization control component, a high-reflection mirror and a second photoelectric detector, wherein the linear polarization single-frequency fiber laser seed source is connected with the phase modulation component;
the linear polarization single-frequency fiber laser output by the linear polarization single-frequency fiber laser seed source sequentially passes through the phase modulation assembly, the polarization controller, the fiber laser preamplifier, the annular isolator and the fiber laser main amplifier, then outputs high-power laser through the fiber collimation end cap, and is subjected to power monitoring by the power meter; the third port of the annular isolator and the transmission light of the high-reflection mirror are respectively connected with the first photoelectric detector and the second photoelectric detector, two monitoring signals enter the polarization control assembly, and a control instruction is transmitted to the polarization controller according to a signal optimization algorithm, so that the polarization state of the linear polarization single-frequency fiber laser is regulated and controlled.
Preferably, the monitoring signal of the second photodetector enters the polarization control assembly, and transmits a control instruction to the polarization controller according to a signal optimization algorithm, so as to regulate and control the polarization state of the linear polarization single-frequency fiber laser and form a closed-loop system; the phase modulation component can regulate and control the spectrum broadening of the linear polarization single-frequency fiber laser, so that the Brillouin scattering gain spectrum width is increased.
Preferably, an optimization algorithm is loaded in the polarization control assembly, and by using the optimization algorithm, the peak value of the laser time domain signal received by the first photodetector and monitored by the reverse SBS effect can be locked to the minimum value, and the peak value and the valley value of the fluctuation of the laser time domain signal received by the second photodetector and monitored by the forward MI effect can be locked to the minimum value.
Preferably, when the first photodetector monitors that the output power of the fiber laser main amplifier is rapidly transferred to the reverse stokes light, it is determined that the SBS effect occurs in the fiber laser main amplifier; and when the second photoelectric detector monitors that the output mode of the fiber laser main amplifier is dynamically coupled from a basic mode to a high-order mode, determining that the MI effect occurs in the fiber laser main amplifier.
Preferably, when the MI effect occurs, the transmitted light of the high reflection mirror enters the second photodetector, and the second photodetector converts an optical signal into an electrical signal and inputs the electrical signal into the polarization control module.
Preferably, when the SBS effect occurs, the reversely transmitted stimulated brillouin scattering light is coupled out through the third port of the annular isolator and enters the first photodetector, and the first photodetector converts an optical signal into an electrical signal and inputs the electrical signal into the polarization control module.
Preferably, the linear polarization single-frequency fiber laser seed source is realized by a distributed feedback laser, a single-frequency ring laser and the like; the laser emitted by the linear polarization single-frequency fiber laser seed source is continuous laser or pulse laser.
Preferably, the phase modulation mode of the wavelength of the laser emitted by the linear polarization single-frequency fiber laser seed source is sine and cosine modulation, white noise modulation, random phase coding modulation, and the like.
Preferably, the polarization controller is an active polarization controller based on piezoelectric type.
The invention has the beneficial effects that:
1. the invention provides a high-power high-beam-quality narrow-linewidth optical fiber laser amplification system which comprises a linear polarization single-frequency optical fiber laser seed source, a phase modulation component, a polarization controller, an optical fiber laser pre-amplification stage, an annular isolator, an optical fiber laser main amplifier, an optical fiber collimation end cap, a laser power meter, a polarization control component, a high-reflection mirror, a first photoelectric detector and a second photoelectric detector. By actively controlling and changing the polarization state of the signal light, the interference intensity of the signal light and the Stokes light in the high-power optical fiber laser amplifier optical fiber can be reduced to the maximum extent, the stimulated Brillouin scattering gain is effectively reduced, and the stimulated Brillouin scattering threshold value is greatly improved; the high-order mode proportion of longitudinal injection and transmission along the gain fiber of the high-power fiber laser amplifier is reduced by changing the polarization state of the seed source, and the suppression of MI effect is realized.
2. According to the high-power high-beam-quality narrow-linewidth optical fiber laser amplification system, the SBS effect and the MI effect of the system are monitored at the same time and are used as dual evaluation functions, a control instruction is transmitted to the polarization controller according to a signal optimization algorithm, the polarization state of seed laser is regulated and controlled, and system closed loop is achieved; meanwhile, the optimal polarization input when two phenomena exist is found through an optimization algorithm, the inhibition of the SBS effect and the MI effect is realized, and a reliable technical means is provided for efficiently and stably outputting laser with a higher power level. Particularly, the high-power high-beam-quality narrow-linewidth fiber laser amplification system provided by the invention can realize the amplification of laser with any wavelength, and the pumping wavelength of the laser and the realization mode of a single-frequency modulation seed source are not limited, so that the high-power high-beam-quality narrow-linewidth fiber laser amplification system has higher universality and practicability.
Drawings
FIG. 1 is a schematic structural diagram of a high power, high beam quality, and narrow linewidth fiber laser amplification system according to the present invention;
the reference numbers are as follows:
1-1, a linear polarization single-frequency fiber laser seed source; 1-2, a phase modulation component; 1-3, polarization controller fiber laser; 1-4, fiber laser preamplifier; 1-5, a ring-shaped isolator; 1-6, a fiber laser main amplifier; 1-7, a fiber alignment end cap; 1-8, a power meter; 1-9, a first photodetector; 1-10, a polarization control component; 1-11, high reflection mirror; 1-12, a second photodetector.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the aspects of the present invention are shown in the drawings, and other details not closely related to the present invention are omitted.
In addition, it should be further noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 1, the high-power, high-beam-quality and narrow-linewidth fiber laser amplification system provided by the invention includes a linear polarization single-frequency fiber laser seed source 1-1, a phase modulation component 1-2, a polarization controller 1-3, a fiber laser preamplifier 1-4, a ring isolator 1-5, a fiber laser main amplifier 1-6, a fiber collimation end cap 1-7, a power meter 1-8, a first photodetector 1-9, a polarization control component 1-10, a high-reflection mirror 1-11, and a second photodetector 1-12.
Specifically, the spectrum of linear polarization single-frequency fiber laser output by a linear polarization single-frequency fiber laser seed source 1-1 is broadened after passing through a phase modulation assembly 1-2, so that the Brillouin scattering gain spectrum width can be directly and effectively increased, the laser after the spectrum broadening enters a polarization controller 1-3, is subjected to power amplification by a fiber laser preamplifier 1-4, is injected into a fiber laser main amplifier 1-6 after passing through an annular isolator 1-5 so that the power of the laser is further amplified, is output through a fiber collimation end cap 1-7, and is monitored by a power meter 1-8 after the laser reaches a high reflection mirror 1-11; the reversely transmitted stimulated Brillouin scattering light is coupled and output through a third port in the annular isolator 1-5, enters the first photoelectric detector 1-9 for SBS effect monitoring, transmits a monitoring signal to the polarization control assembly 1-10, transmits a control instruction to the polarization controller according to a signal optimization algorithm, and regulates and controls the polarization state of the seed laser; the low power transmitted light of the high reflection mirror 1-11 is connected to the second photodetector 1-12.
Preferably, the implementation manner of the linearly polarized single-frequency fiber laser seed source 1-1 is not limited, and includes but is not limited to a distributed feedback laser, a single-frequency ring laser; the phase modulation mode is not limited, and includes but is not limited to sine and cosine modulation, white noise modulation, random phase coding modulation; the wavelength of the laser and the wavelength of the pumping source are not limited; temporal characteristics are not limited and include, but are not limited to, continuous lasers and pulsed lasers.
Preferably, the power amplification stage of the fiber laser preamplifiers 1-4 is not limited.
Preferably, the polarization controllers 1-3 are piezoelectric-based active polarization controllers, including but not limited to azimuth-type polarization controllers, retardation-type polarization controllers, and the like.
Preferably, the polarization control modules 1-10 are loaded with optimization algorithms including, but not limited to, random parallel gradient descent algorithms, hill climbing methods, or genetic algorithms.
The high-power high-beam-quality narrow-linewidth fiber laser amplification system of the present invention is further described with reference to the following specific embodiments:
example 1
Referring to fig. 1, the present embodiment provides a high-power, high-beam-quality, narrow-linewidth fiber laser amplification system, which includes a linear polarization single-frequency fiber laser seed source 1-1, a phase modulation component 1-2, a polarization controller 1-3, a fiber laser preamplifier 1-4, a ring isolator 1-5, a fiber laser main amplifier 1-6, a fiber collimation end cap 1-7, a power meter 1-8, a first photodetector 1-9, a polarization control component 1-10, a high-reflectivity mirror 1-11, and a second photodetector 1-12.
Specifically, a linear polarization single-frequency fiber laser seed source 1-1 is a single-frequency distributed feedback laser, laser emitted by the linear polarization single-frequency fiber laser seed source 1-1 is single-frequency continuous laser, the spectrum of the linear polarization single-frequency fiber laser emitted by the linear polarization single-frequency fiber laser seed source 1-1 is broadened after passing through a phase modulation assembly 1-2, the Brillouin scattering gain spectrum width can be directly and effectively increased, the laser broadened by the spectrum is incident into an azimuth angle type piezoelectric polarization controller, is subjected to power amplification by a fiber laser preamplifier 1-4 with the power of tens of watts, is injected into a fiber laser main amplifier 1-6 after passing through an annular isolator 1-5, so that the power of the laser is further amplified, is output through a fiber collimation end cap 1-7, and is subjected to reflected light power monitoring by a power meter 1-8 after passing through a high-reflection mirror 1-11; the reversely transmitted stimulated Brillouin scattering light is coupled and output through a third port in the annular isolator 1-5 and enters the first photoelectric detector 1-9 for SBS effect monitoring, the low-power transmission light of the high-reflection mirror 1-11 enters the second photoelectric detector 1-12 for MI effect monitoring, monitoring signals of the first photoelectric detector 1-9 and the second photoelectric detector 1-12 are transmitted to the polarization control assembly 1-10, and a control instruction is transmitted to the azimuth type piezoelectric polarization controller according to a signal optimization algorithm so as to regulate and control the polarization state of the seed laser.
The specific process of the regulation and control process is as follows: when the evaluation function of any one of the SBS effect and the MI effect is abnormally increased, the polarization control components 1-10 execute a random parallel gradient descent algorithm, and the specific process of the random parallel gradient descent algorithm is as follows: firstly, the polarization control component 1-10 converts a voltage signal into a digital signal and transmits the digital signal to a processor in the polarization control component 1-10, the processor generates a voltage control signal through signal modulation-demodulation and digital-analog conversion and applies the voltage control signal to a voltage signal input end of a piezoelectric driver of the polarization controller 1-3, and the polarization controller 1-3 converts incident linearly polarized light fiber laser into laser with expected polarization distribution and then outputs the laser, so that system closed loop is realized. And continuing to increase the pumping power, and repeating the regulation and control process when the evaluation function of any one of the SBS effect and the MI effect is abnormally increased.
The regulation mechanism of this example is: when the first photoelectric detector 1-9 monitors that the output power of the optical fiber laser main amplifier 1-6 is rapidly transferred to reverse Stokes light, it is determined that an SBS effect occurs in the optical fiber laser main amplifier 1-6 of the optical path, at this time, the reversely transmitted stimulated Brillouin scattering light is coupled and output through a third port in the annular isolator 1-5 and enters the first photoelectric detector 1-9, the backward Stokes light rises sharply, and the time domain is expressed as a pulse state, and then an optical time domain signal peak value on the photoelectric detector brought by an abnormal phenomenon of backward light can be used as an evaluation function of polarization state control signal optimization design and control, the first photoelectric detector 1-9 converts an optical signal into an electric signal and inputs the electric signal into the polarization control component 1-10, and transmits a control instruction to the azimuth angle type piezoelectric polarization controller according to a signal optimization algorithm so as to regulate and control the polarization state of the seed laser;
when the second photodetector monitors that dynamic coupling from a base mode to a high-order mode occurs in an output mode from 1-12 to the optical fiber laser main amplifier 1-6, and the coupling frequency is about 2kHz, the MI effect occurs in the optical fiber laser main amplifier 1-6, at the moment, an optical time domain signal monitored by the photodetector obviously fluctuates, the peak-to-valley value of the fluctuating voltage is increased rapidly compared with that when the MI effect does not occur, the peak-to-valley value of the optical time domain signal can be used as an evaluation function for optimal design and control of a polarization state control signal, at the moment, the transmission light of the high reflector 1-11 enters the second photodetector 1-12, and the second photodetector 1-12 converts the optical signal into an electric signal and inputs the electric signal into the polarization control component 1-10. The final goal of the above system optimization is to lock the peak value of the laser time domain signal received by the reverse SBS effect monitoring first photodetector 1-9 to the minimum value, and lock the PV value of the fluctuation of the laser time domain signal received by the forward MI effect monitoring second photodetector 1-12 to the minimum value. By the mode, the SBS effect and the MI effect in the fiber laser amplification system can be simultaneously inhibited, so that the aim of outputting high-power laser is fulfilled.
Example 2
Example 2 differs from example 1 only in that: the second photodetectors 1 to 12 in the fiber laser amplification system in this embodiment are not connected to the polarization control assemblies 1 to 10, and other setting manners are basically the same as those in embodiment 1, and are not described herein again.
The regulation and control principle of the embodiment is as follows: when the first photoelectric detector 1-9 monitors that the output power of the optical fiber laser main amplifier 1-6 is rapidly transferred to the reverse Stokes light, and the SBS effect is judged to occur in the optical fiber laser main amplifier 1-6 of the optical path, at the moment, the reversely transmitted stimulated Brillouin scattering light is coupled and output through a third port in the annular isolator 1-5 and enters the first photoelectric detector 1-9, the backward Stokes light rises rapidly, and the time domain is expressed in a pulse state, then, the peak value of an optical time domain signal on the photoelectric detector caused by the abnormal phenomenon of backward light can be used as an evaluation function of the optimization design and control of a polarization state control signal, the first photoelectric detector 1-9 converts the optical signal into an electric signal and inputs the electric signal into the polarization control component 1-10, and transmits a control command to the azimuth angle type piezoelectric polarization controller according to a signal optimization algorithm so as to regulate and control the polarization state of the seed laser; the SBS effect in the fiber laser amplification system can be inhibited through the process.
In summary, the high-power high-beam-quality narrow-linewidth optical fiber laser amplification system provided by the invention can reduce the interference intensity of the signal light and the stokes light in the optical fiber of the high-power optical fiber laser amplifier to the maximum extent by actively controlling and changing the polarization state of the signal light, effectively reduce the stimulated brillouin scattering gain, and greatly improve the stimulated brillouin scattering threshold value; the high-order mode proportion of longitudinal injection and transmission along the gain fiber of the high-power fiber laser amplifier is reduced by changing the polarization state of the seed source, so that the suppression of MI effect is realized; the optimal polarization input when two phenomena exist is found through an optimization algorithm, the purpose of simultaneously inhibiting the SBS effect and the MI effect is achieved, and a reliable technical means is provided for efficiently and stably outputting laser with a higher power level.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (8)
1. A high-power high-beam-quality narrow-linewidth fiber laser amplification system is characterized by comprising a linear polarization single-frequency fiber laser seed source, a phase modulation component, a polarization controller, a fiber laser preamplifier, an annular isolator, a fiber laser main amplifier, a fiber collimation end cap, a power meter, a first photoelectric detector, a polarization control component, a high-reflection mirror and a second photoelectric detector;
the linear polarization single-frequency fiber laser output by the linear polarization single-frequency fiber laser seed source sequentially passes through the phase modulation assembly, the polarization controller, the fiber laser preamplifier, the annular isolator and the fiber laser main amplifier, then outputs high-power laser through the fiber collimation end cap, and is subjected to power monitoring by the power meter; the third port of the annular isolator and the transmission light of the high-reflection mirror are respectively connected with the first photoelectric detector and the second photoelectric detector, two monitoring signals enter the polarization control assembly, and a control instruction is transmitted to the polarization controller according to a signal optimization algorithm to regulate and control the polarization state of the linear polarization single-frequency fiber laser;
monitoring signals of the second photoelectric detector enter the polarization control assembly, control instructions are transmitted to the polarization controller according to a signal optimization algorithm, the polarization state of the linear polarization single-frequency fiber laser is regulated and controlled, and a closed-loop system is formed; the phase modulation component can regulate and control the spectrum broadening of the linear polarization single-frequency fiber laser, so that the Brillouin scattering gain spectrum width is increased.
2. The high power, high beam quality and narrow linewidth fiber laser amplification system of claim 1, wherein an optimization algorithm is loaded in the polarization control module, and the optimization algorithm can lock a peak value of the laser time domain signal received by the first photodetector to a minimum value by monitoring the reverse SBS effect, and lock a peak value of a fluctuation of the laser time domain signal received by the second photodetector to a minimum value by monitoring the forward MI effect.
3. The high-power high-beam-quality narrow-linewidth fiber laser amplification system according to claim 2, wherein the SBS effect is determined to occur in the fiber laser main amplifier when the first photodetector monitors that the output power of the fiber laser main amplifier is rapidly transferred to the reverse Stokes light; and when the second photoelectric detector monitors that the output mode of the fiber laser main amplifier is dynamically coupled from a basic mode to a high-order mode, determining that the MI effect occurs in the fiber laser main amplifier.
4. The high power, high beam quality, narrow linewidth fiber laser amplification system of claim 3 in which when the MI effect occurs, the transmitted light from the high reflection mirror enters the second photodetector, which converts the optical signal to an electrical signal and inputs it to the polarization control module.
5. The high-power high-beam-quality narrow-linewidth fiber laser amplification system according to claim 3, wherein when the SBS effect occurs, the reversely transmitted stimulated Brillouin scattering light is coupled out through the third port of the annular isolator and enters the first photodetector, and the first photodetector converts an optical signal into an electrical signal and inputs the electrical signal into the polarization control assembly.
6. The high-power high-beam-quality narrow-linewidth fiber laser amplification system of claim 1, wherein the linearly polarized single-frequency fiber laser seed source is implemented by a distributed feedback laser, a single-frequency ring laser; the laser emitted by the linear polarization single-frequency fiber laser seed source is continuous laser or pulse laser.
7. The high-power high-beam-quality narrow-linewidth fiber laser amplification system of claim 1, wherein the linear polarization single-frequency fiber laser seed source emits laser with wavelength modulated by sine and cosine modulation, white noise modulation, and random phase coding modulation.
8. The high power, high beam quality, narrow linewidth fiber laser amplification system of claim 1 in which the polarization controller is a piezoelectric based active polarization controller.
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| CN108462023A (en) * | 2018-05-29 | 2018-08-28 | 中国人民解放军国防科技大学 | High-power optical fiber laser amplifier system with high mode instability threshold |
| CN108512028A (en) * | 2018-05-29 | 2018-09-07 | 中国人民解放军国防科技大学 | System for inhibiting mode instability in high-power optical fiber laser amplifier |
| CN112018587A (en) * | 2020-07-27 | 2020-12-01 | 横琴东辉科技有限公司 | System and method for inhibiting SBS (styrene-butadiene-styrene) to realize high-power single-frequency fiber laser output |
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| US8054539B2 (en) * | 2008-03-14 | 2011-11-08 | General Atomics | Optical system for reducing stimulated Brillouin scattering by controllably changing polarization direction of an optical signal |
| US8995049B2 (en) * | 2011-09-08 | 2015-03-31 | Northrop Grumman Systems Corporation | Method and apparatus for suppression of stimulated brillouin scattering using polarization control with a birefringent delay element |
| US9214781B2 (en) * | 2013-11-21 | 2015-12-15 | Lockheed Martin Corporation | Fiber amplifier system for suppression of modal instabilities and method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108462023A (en) * | 2018-05-29 | 2018-08-28 | 中国人民解放军国防科技大学 | High-power optical fiber laser amplifier system with high mode instability threshold |
| CN108512028A (en) * | 2018-05-29 | 2018-09-07 | 中国人民解放军国防科技大学 | System for inhibiting mode instability in high-power optical fiber laser amplifier |
| CN112018587A (en) * | 2020-07-27 | 2020-12-01 | 横琴东辉科技有限公司 | System and method for inhibiting SBS (styrene-butadiene-styrene) to realize high-power single-frequency fiber laser output |
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