CN107086428A - The narrow linewidth fiber pulse laser and its application method of a kind of high-peak power - Google Patents
The narrow linewidth fiber pulse laser and its application method of a kind of high-peak power Download PDFInfo
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- CN107086428A CN107086428A CN201710428556.4A CN201710428556A CN107086428A CN 107086428 A CN107086428 A CN 107086428A CN 201710428556 A CN201710428556 A CN 201710428556A CN 107086428 A CN107086428 A CN 107086428A
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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
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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
- H01S3/10084—Frequency control by seeding
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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
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
The present invention is the narrow linewidth fiber pulse laser and its application method of a kind of high-peak power, and this laser seed source exports laser and separates main road through the output of first phase modulator, optical fiber phase shifter, Cascaded Optical Amplifier Transmission Systems, second phase modulator and the second optical fiber splitter in the first optical fiber splitter.Two shunts separate tuftlet laser incoming fiber optic interferometer, and beat signal is through photodetector Access Control circuit, and it controls optical fiber phase shifter and radio frequency amplifier.This method frequency source drives two phase modulator；Narrow linewidth pulse laser is exported after spectrum widening phase adjusted Cascaded amplification compressed spectrum；Control circuit continuously adjusts optical fiber phase shifter phase, the phase shifter state for taking beat frequency intensity minimum；Cumulative second power RF amplifier, is locked in beat frequency intensity minimum power point；Control circuit persistently monitors beat frequency intensity and adjusts optical fiber phase shifter in real time.The present invention improves the maximum output peak power of narrow linewidth fiber pulse laser, it is ensured that narrow linewidth characteristic is constant.
Description
Technical field
The present invention relates to a kind of optical fiber laser, and in particular to a kind of narrow linewidth fiber pulse laser of high-peak power
And its application method.
Background technology
Narrow linewidth fiber pulse laser is one of principal light sources of application such as laser radar, remote sensing, 3D imagings.Optical fiber swashs
Light utensil has that small volume, lightweight, unimodular property are good, operating efficiency is high, radiating is simple, long lifespan, high reliability；So
And, due to fiber optic aperture limitation, the output maximum peak power of narrow linewidth fiber pulse laser is limited by nonlinear effect
System, the mainly limitation of stimulated Brillouin scattering (SBS) threshold value；Once laser output power reaches SBS threshold, it will produce
Very strong backward laser pulse, may produce permanent damage to laser.Narrow linewidth fiber pulse laser SBS is improved at present
The main method of threshold value has increase fibre core diameter, the doping concentration of raising active medium to use length to shorten Active Optical Fiber
Deng, but still there is a big difference with solid state laser maximum output peak power for the laser pulse maximum peak power reached；Use
Phase-modulator can improve the SBS threshold of laser to laser spectrum broadening, but be lost the narrow linewidth of laser simultaneously
Characteristic.
The content of the invention
In order to overcome limitations of the SBS to narrow linewidth fiber pulse laser maximum output peak power, the present invention provides one
The narrow linewidth fiber pulse laser and its application method of high-peak power are planted, the laser of narrow linewidth pulsed laser source output is first
Part optical signals are separated as local reference laser by optical fiber splitter, and the main laser signal of optical fiber splitter output is then through light
Fine phase-modulator carries out spectrum widening, then amplifies through optical fiber phase shifter, Cascaded Optical Amplifier Transmission Systems, and laser spectrum broadening is improved
SBS threshold, makes amplifier export maximum peak power and improves；Laser after amplification carries out spectrum by second phase-modulator
Compression, exports the high-power laser pulse of narrow linewidth.Compressed by laser spectrum broadening-amplification-laser spectrum, improve peak value
Power, while keep laser narrow linewidth characteristic.
A kind of narrow linewidth fiber pulse laser of high-peak power of the present invention include narrow linewidth pulse laser seeds source and
Fiber amplifier, in addition to two optical fiber splitters, two phase-modulators, optical fiber phase shifter, fibre optic interferometer, photodetections
Device and control circuit, the continuous laser of narrow linewidth pulse laser seeds source output accesses the first optical fiber splitter, is divided into two-way, main
First phase modulator, an input arm of another road incoming fiber optic interferometer are accessed in road.Main road laser is modulated in first phase
Device broadened laser spectrum, to improve SBS threshold, afterwards incoming fiber optic phase shifter, regulation laser phase, its export connection cascade light
Fiber amplifier, improves peak power, then accesses second phase modulator, and compressed spectrum finally enters the second optical fiber splitter, greatly
Another input arm of above-mentioned fibre optic interferometer is accessed in part as output, fraction.Narrow linewidth pulse laser seeds source is sent
Laser and this laser output signal carry out relevant detection in fibre optic interferometer, and the beat signal of generation is through photodetector photoelectricity
Conversion, electric signal Access Control circuit, the control signal connection optical fiber phase shifter and radio frequency amplifier of control circuit control circuit
Control optical fiber phase shifter and radio frequency amplifier realize that laser spectrum compresses jointly.
Frequency source is the driving frequency source of two phase-modulators, and the signal of frequency source output is divided into the beam of identical two difference
Through the first radio frequency amplifier and the second radio frequency amplifier, first phase modulator and second phase modulator are driven respectively, are realized
The driving frequency of two phase-modulators is consistent.
The narrow linewidth pulse laser seeds source is narrow linewidth semiconductor laser or narrow cable and wide optical fiber laser connection electricity
Optical modulator or acousto-optic modulator, laser send continuous laser, and modulator carries out amplitude modulation(PAM).
The first optical fiber splitter splitting ratio is 99:1 to 50:50, preferred version splitting ratio is 90:10 to 95:5, its
Middle most of light output is to main road, and fraction light connects an input arm of fibre optic interferometer than output end.
Described two phase-modulators are the identical lithium niobate electro-optic phase modulator of driving frequency, and modulating frequency is
100MHz~10GHz, to reach preferable spectrum widening effect, and signal transacting is convenient；The driving work(of two phase-modulators
Rate has certain proportion, the phase-modulation of the phase modulation depth of second phase modulator and first phase modulator under the ratio
Deep equality.
Wherein first phase modulator is the modulator with optical fiber pigtail, for laser spectrum broadening, to improve laser
SBS threshold；Second phase modulator is the body phase-modulator of spatial light, to improve the laser damage threshold of modulator end face
Value, for laser spectrum compression, reverts to narrow-linewidth laser.
The optical fiber phase shifter is optical waveguide modulator, i.e. Y waveguide, or to be wrapped in the light on piezoelectric ceramics (PZT)
Fiber device, phase adjusted amount is more than π.The odd-multiple that the laser phase difference for ensuring to enter two phase-modulators is π.
The Cascaded Optical Amplifier Transmission Systems are the two-stage or 3-stage optical fiber amplifier of cascade, and final amplifier therein is low number
It is worth aperture large mode field double-cladding fiber amplifier.
The second optical branching device splitting ratio is 99:1 to 90:10, the power laser of wherein large percentage accesses this laser
The output end of device, the less power laser of ratio connects another input arm of fibre optic interferometer.
A kind of application method key step of the narrow linewidth fiber pulse laser of high-peak power of the present invention is as follows：
Step I, start
Narrow linewidth pulse laser seeds source, phase-modulator, cascade amplifier and radio frequency amplifier switch on power；
Step II, frequency source driving phase-modulator
The electric signal of frequency source output is divided into two-way and respectively enters the first radio frequency amplifier and the second radio frequency amplifier, two
Radio frequency amplifier amplification output equal-wattage, drives first phase modulator and second phase modulator respectively；
The pulse laser output of step III, spectrum widening
Open narrow linewidth pulse laser seeds source and Cascaded Optical Amplifier Transmission Systems, the company of narrow linewidth pulse laser seeds source output
Continuous laser accesses the first optical fiber splitter, is divided into the laser pulse of main road through first phase modulator, realizes spectrum widening, afterwards
Into optical fiber phase shifter, regulation laser phase, enter back into Cascaded Optical Amplifier Transmission Systems, improve peak power, it is exported accesses the again
Two phase modulator, sends into the second optical fiber splitter, the pulse laser mostly as output is separated in the second optical fiber splitter；
Step IV, regulation optical fiber phase shifter phase, carry out spectrum compression
The pulse laser and first that another part narrow linewidth pulse laser seeds source that first optical fiber splitter is separated is sent
Another part this laser output signal power that optical fiber splitter is separated is identical, while into fibre optic interferometer, in order to enter
The relevant detection of row, the beat signal of the relevant gained of fibre optic interferometer output two bundle of pulsed laser, through photodetector opto-electronic conversion,
Electric signal Access Control circuit, controls the difference frequency and beat frequency intensity of electric circuit inspection beat signal, the beat of the beat signal
Frequency is the working frequency of frequency source；Control circuit continuously adjusts optical fiber phase shifter phase place change to π or ± pi/2, monitors beat frequency
The change of intensity, is exactly that the phase difference of two phase-modulators is π odd-multiple, second phase is adjusted when beat frequency intensity is minimum
Device processed carries out spectrum compression to the pulse laser of entrance；
Step V, the second radio frequency amplifier amplifying power of regulation, further spectrum compression
When keeping beat frequency intensity minimum, i.e., the optical fiber phase shifter when phase difference of two phase-modulators is π odd-multiple
State, control circuit adjusts the second radio frequency amplifier, gradually increases its amplifying power, drives second phase modulator, monitoring
The change of beat frequency intensity, when beat frequency intensity is minimum, the as optimum output power of the second radio frequency amplifier；Second radio frequency is put
Big device power output is locked in the power points, and second phase modulator compresses to the further spectrum of pulse laser of entrance, output
The narrow linewidth fiber pulse laser of high-peak power；
Step VI, monitoring beat frequency intensity, adjust optical fiber phase shifter in real time
Control circuit persistently monitors the change of beat frequency intensity, when laser temperature change or extraneous vibration, is likely to result in
Laser works phase drift, beat frequency Strength Changes, control circuit adjusts optical fiber phase shifter in real time, and beat frequency intensity is locked in most
Small state, the pulse laser spectrum of output is compressed to minimum, persistently exports the narrow linewidth fiber pulse laser of high-peak power.
Compared with prior art, the narrow linewidth fiber pulse laser and its application method of a kind of high-peak power of the invention
Beneficial effect is：1st, narrow-linewidth laser pulse peak power output during fiber amplifier is overcome to be limited by SBS threshold
Shortcoming, the maximum output peak power of narrow linewidth fiber pulse laser is improved, while ensureing that pulse laser narrow linewidth is special
Property it is constant, can be achieved to export pulse laser into the peak power of peak power 200W or so pulsewidth 100ns level pulse laser
Multikilowatt is brought up to, 10kW or so excited Raman threshold value is reached as high as, line width then can be controlled in below 1MHz, it is ensured that laser
High coherence property；2nd, real-time monitoring laser temperature change and extraneous vibration cause laser works phase drift, adjust in time
Optical fiber phase shifter is saved, keeps laser pulse light spectrum compression effectiveness to be in optimum state.
Brief description of the drawings
Fig. 1 is the narrow linewidth fiber pulse laser example structure schematic diagram of this high-peak power.
Fig. 2 is the application method embodiment workflow diagram of the narrow linewidth fiber pulse laser of this high-peak power.
Embodiment
The narrow linewidth fiber pulse laser embodiment of this high-peak power is as shown in figure 1, dotted arrow is believed for light in figure
Number transmission, solid arrow is electric signal transmission.The continuous laser of narrow linewidth pulse laser seeds source output accesses the first optical fiber point
Road device, is divided into two-way, and 95% light enters main road and accesses first phase modulator, the soft exchange fibre optic interferometer on another road 5%
An input arm.Main road laser is in first phase modulator broadened laser spectrum, incoming fiber optic phase shifter, regulation laser afterwards
Phase, it exports connection Cascaded Optical Amplifier Transmission Systems, then accesses second phase modulator, and compressed spectrum finally enters the second optical fiber
Shunt, 99% light is used as output, another input arm of the 1% above-mentioned fibre optic interferometer of access.Narrow linewidth pulse laser seeds
The laser and this laser output signal that source is sent carry out relevant detection in fibre optic interferometer, and the beat signal of generation is visited through photoelectricity
Device opto-electronic conversion is surveyed, electric signal Access Control circuit, the control signal of control circuit connects optical fiber phase shifter and radio frequency amplifier,
Control circuit control optical fiber phase shifter and radio frequency amplifier realize that laser spectrum compresses jointly.
Frequency source is the driving frequency source of two phase-modulators, and the signal of frequency source output is divided into the beam of identical two difference
Through the first radio frequency amplifier and the second radio frequency amplifier, first phase modulator and second phase modulator are driven respectively, are realized
The driving frequency of two phase-modulators is consistent.
This example narrow linewidth pulse laser seeds source is that narrow linewidth semiconductor laser connects electrooptic modulator.
Two phase-modulators of this example are the identical lithium niobate electro-optic phase modulator of driving frequency, and modulating frequency is
1GHz, the ratio of the driving power of two phase-modulators is：The phase modulation depth of second phase modulator under the ratio
It is equal with the phase modulation depth of first phase modulator.
Wherein first phase modulator is the modulator with optical fiber pigtail, and second phase modulator is the body phase position of spatial light
Modulator.
This example optical fiber phase shifter is optical waveguide modulator, and phase adjusted amount is more than π.
This example Cascaded Optical Amplifier Transmission Systems are the 3-stage optical fiber amplifier of cascade, and final amplifier therein is low numerical aperture
Large mode field double-cladding fiber amplifier.
The application method embodiment of the narrow linewidth fiber pulse laser of high-peak power
The application method embodiment of the narrow linewidth fiber pulse laser of this high-peak power is above-mentioned high-peak power
The application method of narrow linewidth fiber pulse laser embodiment, the example method flow is as shown in Fig. 2 key step is as follows：
Step I, start
Narrow linewidth pulse laser seeds source, phase-modulator, cascade amplifier and radio frequency amplifier switch on power；
Step II, frequency source driving phase-modulator
The electric signal of frequency source output is divided into two-way and respectively enters the first radio frequency amplifier and the second radio frequency amplifier, two
Radio frequency amplifier amplification output equal-wattage, drives first phase modulator and second phase modulator respectively；
The pulse laser output of step III, spectrum widening
Open narrow linewidth pulse laser seeds source and Cascaded Optical Amplifier Transmission Systems, the company of narrow linewidth pulse laser seeds source output
Continuous laser accesses the first optical fiber splitter, is divided into the laser pulse of main road through first phase modulator, realizes spectrum widening, afterwards
Into optical fiber phase shifter, regulation laser phase, enter back into Cascaded Optical Amplifier Transmission Systems, improve peak power, it is exported accesses the again
Two phase modulator, sends into the second optical fiber splitter, the pulse laser mostly as output is separated in the second optical fiber splitter；
Step IV, regulation optical fiber phase shifter phase, carry out spectrum compression
The pulse laser and first that another part narrow linewidth pulse laser seeds source that first optical fiber splitter is separated is sent
Another part this laser output signal power that optical fiber splitter is separated is identical, while into fibre optic interferometer, in order to enter
The relevant detection of row, the beat signal of the relevant gained of fibre optic interferometer output two bundle of pulsed laser, through photodetector opto-electronic conversion,
Electric signal Access Control circuit, controls the difference frequency and beat frequency intensity of electric circuit inspection beat signal, the beat of the beat signal
Frequency is the working frequency of frequency source；Control circuit continuously adjusts optical fiber phase shifter phase place change to π or ± pi/2, monitors beat frequency
The change of intensity, is exactly that the phase difference of two phase-modulators is π odd-multiple, second phase is adjusted when beat frequency intensity is minimum
Device processed carries out spectrum compression to the pulse laser of entrance；
Step V, the second radio frequency amplifier amplifying power of regulation, further spectrum compression
When keeping beat frequency intensity minimum, i.e., the optical fiber phase shifter when phase difference of two phase-modulators is π odd-multiple
State, control circuit adjusts the second radio frequency amplifier, gradually increases its amplifying power, drives second phase modulator, monitoring
The change of beat frequency intensity, when beat frequency intensity is minimum, the as optimum output power of the second radio frequency amplifier；Second radio frequency is put
Big device power output is locked in the power points, and second phase modulator compresses to the further spectrum of pulse laser of entrance, output
The narrow linewidth fiber pulse laser of high-peak power；
Step VI, persistently monitoring beat frequency intensity, adjust optical fiber phase shifter in real time
Control circuit persistently monitors the change of beat frequency intensity, when laser temperature change or extraneous vibration, is likely to result in
Laser works phase drift, beat frequency Strength Changes, control circuit adjusts optical fiber phase shifter in real time, and beat frequency intensity is locked in most
Small state, the pulse laser spectrum of output is compressed to minimum, persistently exports the narrow linewidth fiber pulse laser of high-peak power.This
The pulsed laser power peak value of example output reaches 2kW.
Above-described embodiment, is only to the specific of the purpose of the present invention, technical scheme and beneficial effect further description
Individual example, the present invention is not limited to this.All any modifications made within the scope of disclosure of the invention, equivalent substitution, change
Enter, be all contained within protection scope of the present invention.
Claims (10)
1. a kind of narrow linewidth fiber pulse laser of high-peak power, including narrow linewidth pulse laser seeds source and fiber amplifier
Device, it is characterised in that：
Also include two optical fiber splitters, two phase-modulators, optical fiber phase shifter, fibre optic interferometer, photodetector and control
Circuit processed；The continuous laser of the narrow linewidth pulse laser seeds source output accesses the first optical fiber splitter, is divided into two-way, main road
Access first phase modulator, an input arm of another road incoming fiber optic interferometer；Main road laser is in first phase modulator
Broadened laser spectrum, afterwards incoming fiber optic phase shifter, its output connection Cascaded Optical Amplifier Transmission Systems, then access second phase modulation
Device, compressed spectrum finally enters the second optical fiber splitter, and mostly as output, fraction accesses above-mentioned fibre optic interferometer
Another input arm, the laser and this laser output signal that narrow linewidth pulse laser seeds source is sent carries out phase in fibre optic interferometer
Dry detection, the beat signal of generation is through photodetector opto-electronic conversion, electric signal Access Control circuit, the control letter of control circuit
Number connection optical fiber phase shifter and radio frequency amplifier；
Frequency source is the driving frequency source of two phase-modulators, and the signal of frequency source output is divided into the beam of identical two respectively through the
One radio frequency amplifier and the second radio frequency amplifier, drive first phase modulator and second phase modulator respectively.
2. the narrow linewidth fiber pulse laser of high-peak power according to claim 1, it is characterised in that：
The narrow linewidth pulse laser seeds source is that narrow linewidth semiconductor laser or narrow cable and wide optical fiber laser connection electric light are adjusted
Device or acousto-optic modulator processed.
3. the narrow linewidth fiber pulse laser of high-peak power according to claim 1, it is characterised in that：
The first optical fiber splitter splitting ratio is 99:1 to 50:50, wherein most light output to main road, fraction light ratio
Output end connects an input arm of fibre optic interferometer.
4. the narrow linewidth fiber pulse laser of high-peak power according to claim 3, it is characterised in that：
The first optical fiber splitter splitting ratio is 90:10 to 95:5.
5. the narrow linewidth fiber pulse laser of high-peak power according to claim 1, it is characterised in that：
Described two phase-modulators are the identical lithium niobate electro-optic phase modulator of modulating frequency, and modulating frequency is
100MHz~10GHz, and the driving power of two phase-modulators has certain proportion, the second phase modulator under the ratio
Phase modulation depth it is equal with the phase modulation depth of first phase modulator.
6. the narrow linewidth fiber pulse laser of high-peak power according to claim 5, it is characterised in that：
The first phase modulator is the modulator with optical fiber pigtail；Second phase modulator is the body phase-modulation of spatial light
Device.
7. the narrow linewidth fiber pulse laser of high-peak power according to claim 1, it is characterised in that：
The optical fiber phase shifter is optical waveguide modulator, or to be wrapped in the optical fibre device on piezoelectric ceramics, phase adjusted amount
More than π.
8. the narrow linewidth fiber pulse laser of high-peak power according to claim 1, it is characterised in that：
The Cascaded Optical Amplifier Transmission Systems are the two-stage or 3-stage optical fiber amplifier of cascade, and final amplifier therein is low numerical aperture
Footpath large mode field double-cladding fiber amplifier.
9. the narrow linewidth fiber pulse laser of high-peak power according to claim 1, it is characterised in that：
The second optical branching device splitting ratio is 99:1 to 90:10, the power laser of wherein large percentage accesses this laser
Output end, the less power laser of ratio connects another input arm of fibre optic interferometer.
10. the user of the narrow linewidth fiber pulse laser of high-peak power according to any one of claim 1 to 9
Method, it is characterised in that key step is as follows：
Step I, start
Narrow linewidth pulse laser seeds source, phase-modulator, cascade amplifier and radio frequency amplifier switch on power；
Step II, frequency source driving phase-modulator
The electric signal of frequency source output is divided into two-way and respectively enters the first radio frequency amplifier and the second radio frequency amplifier, two radio frequencies
Amplifier amplification output equal-wattage, drives first phase modulator and second phase modulator respectively；
The pulse laser output of step III, spectrum widening
Narrow linewidth pulse laser seeds source and Cascaded Optical Amplifier Transmission Systems are opened, the continuous of narrow linewidth pulse laser seeds source output swashs
The optical fiber splitter of soft exchange first, is divided into the laser pulse of main road through first phase modulator, realizes spectrum widening, enter afterwards
Optical fiber phase shifter, regulation laser phase, enter back into Cascaded Optical Amplifier Transmission Systems, improve peak power, its output accesses the second phase again
Position modulator, sends into the second optical fiber splitter, the pulse laser mostly as output is separated in the second optical fiber splitter；
Step IV, regulation optical fiber phase shifter phase, carry out spectrum compression
Pulse laser and the first optical fiber that another part narrow linewidth pulse laser seeds source that first optical fiber splitter is separated is sent
Another part this laser output signal power that shunt is separated is identical, while into fibre optic interferometer, in order to carry out phase
Dry detection, the beat signal of the relevant gained of fibre optic interferometer output two bundle of pulsed laser, through photodetector opto-electronic conversion, telecommunications
Number Access Control circuit, controls the difference frequency and beat frequency intensity of electric circuit inspection beat signal, the difference frequency of the beat signal
For the working frequency of frequency source；Control circuit continuously adjusts optical fiber phase shifter phase place change to π or ± pi/2, monitors beat frequency intensity
Change, be exactly that the phase difference of two phase-modulators is π odd-multiple, second phase modulator when beat frequency intensity is minimum
Spectrum compression is carried out to the pulse laser of entrance；
Step V, the second radio frequency amplifier amplifying power of regulation, further spectrum compression
When keeping beat frequency intensity minimum, i.e., the shape of the optical fiber phase shifter when phase difference of two phase-modulators is π odd-multiple
State, control circuit adjusts the second radio frequency amplifier, gradually increases its amplifying power, drives second phase modulator, monitors beat frequency
The change of intensity, when beat frequency intensity is minimum, the as optimum output power of the second radio frequency amplifier；By the second radio frequency amplifier
Power output is locked in the power points, and second phase modulator compresses to the further spectrum of pulse laser of entrance, exports peak
It is worth the narrow linewidth fiber pulse laser of power；
Step VI, persistently monitoring beat frequency intensity, adjust optical fiber phase shifter in real time
Control circuit persistently monitors the change of beat frequency intensity, when laser temperature change or extraneous vibration, is likely to result in laser
Device operating phase drifts about, beat frequency Strength Changes, and control circuit adjusts optical fiber phase shifter in real time, and beat frequency intensity is locked in into minimum shape
State, the pulse laser spectrum of output is compressed to minimum, persistently exports the narrow linewidth fiber pulse laser of high-peak power.
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Cited By (4)
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| CN109596148A (en) * | 2018-12-07 | 2019-04-09 | 山西大学 | A method of improving compression light detection device interference efficiency |
| CN111751844A (en) * | 2020-07-07 | 2020-10-09 | 南京红露麟激光雷达科技有限公司 | Coherent laser radar based on frequency domain coding technology |
| CN112103758A (en) * | 2020-08-07 | 2020-12-18 | 中国科学院上海光学精密机械研究所 | High-power frequency doubling single-frequency laser generating device for phase modulation and demodulation |
| CN114465079A (en) * | 2022-01-26 | 2022-05-10 | 中国电子科技集团公司第十一研究所 | Narrow-linewidth pulse fiber laser and control method thereof |
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| CN114465079A (en) * | 2022-01-26 | 2022-05-10 | 中国电子科技集团公司第十一研究所 | Narrow-linewidth pulse fiber laser and control method thereof |
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