CN206850215U - A kind of narrow linewidth fiber pulse laser of high-peak power - Google Patents
A kind of narrow linewidth fiber pulse laser of high-peak power Download PDFInfo
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- CN206850215U CN206850215U CN201720665989.7U CN201720665989U CN206850215U CN 206850215 U CN206850215 U CN 206850215U CN 201720665989 U CN201720665989 U CN 201720665989U CN 206850215 U CN206850215 U CN 206850215U
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- phase
- laser
- narrow linewidth
- optical fiber
- pulse laser
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Abstract
The utility model is a kind of narrow linewidth fiber pulse laser 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 for beat signal through photodetector Access Control circuit, it controls optical fiber phase shifter and radio frequency amplifier.Frequency source drives two phase modulator；Narrow linewidth pulse laser exports after spectrum widening phase adjusted Cascaded amplification compressed spectrum；Control circuit continuously adjusts optical fiber phase shifter phase, takes the minimum phase shifter state of beat frequency intensity；Cumulative second power RF amplifier, it 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 utility model improves the maximum output peak power of narrow linewidth fiber pulse laser, ensures that narrow linewidth characteristic is constant.
Description
Technical field
It the utility model is related to a kind of optical fiber laser, and in particular to a kind of narrow linewidth fiber pulse of high-peak power swashs
Light device.
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 small volume, in light weight, unimodular property is good, operating efficiency is high, radiating is simple, long lifespan, high reliability；So
And because fiber optic aperture limits, 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, will produce
Very strong backward laser pulse, permanent damage may be produced 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, but be lost the narrow linewidth of laser simultaneously to laser spectrum broadening
Characteristic.
Utility model content
In order to overcome limitations of the SBS to narrow linewidth fiber pulse laser maximum output peak power, the utility model carries
For a kind of narrow linewidth fiber pulse laser of high-peak power, the laser of narrow linewidth pulsed laser source output first passes around optical fiber
Shunt separates part optical signals and then adjusted as local reference laser, the main laser signal of optical fiber splitter output through fiber phase
Device processed carries out spectrum widening, then amplifies through optical fiber phase shifter, Cascaded Optical Amplifier Transmission Systems, and laser spectrum broadening improves SBS threshold,
Improve amplifier output maximum peak power；Laser after amplification carries out spectrum compression by second phase-modulator, defeated
Go out the high-power laser pulse of narrow linewidth.Compressed by laser spectrum broadening-amplification-laser spectrum, improve peak power, same
When keep laser narrow linewidth characteristic.
A kind of narrow linewidth fiber pulse laser of high-peak power of the utility model includes 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, photoelectricity
Detector and control circuit, the continuous laser of narrow linewidth pulse laser seeds source output access the first optical fiber splitter, are divided into two
Road, main road access first phase modulator, an input arm of another way incoming fiber optic interferometer.Main road laser is in first phase
Modulator broadened laser spectrum, to improve SBS threshold, afterwards incoming fiber optic phase shifter, regulation laser phase, its export connection level
Join fiber amplifier, improve peak power, then access second phase modulator, compressed spectrum, finally enter the second fiber optic splitter
Device, mostly as output, fraction accesses another input arm of above-mentioned fibre optic interferometer.Send out in narrow linewidth pulse laser seeds source
The laser and this laser output signal gone out carries out relevant detection in fibre optic interferometer, and caused beat signal is through photodetector
Opto-electronic conversion, electric signal Access Control circuit, the control signal connection optical fiber phase shifter and radio frequency amplifier of control circuit, control
Circuit controls optical fiber phase shifter and radio frequency amplifier to 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 connects an input arm of fibre optic interferometer than output end to main road, fraction light.
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, compressed for laser spectrum, revert 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 are 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 low number for the two-stage or 3-stage optical fiber amplifier, final amplifier therein of cascade
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, another input arm of the less power laser connection fibre optic interferometer of ratio.
A kind of the narrow linewidth fiber pulse laser of high-peak power of the utility model switches on power in use, starting shooting
Afterwards, the electric signal that frequency source exports is divided into two-way and respectively enters the first radio frequency amplifier and the second radio frequency amplifier, drives respectively
First phase modulator and second phase modulator.
The continuous laser of narrow linewidth pulse laser seeds source output accesses the first optical fiber splitter, is divided into the laser arteries and veins of main road
Punching realizes spectrum widening, afterwards into optical fiber phase shifter, regulation laser phase, enters back into cascade light through first phase modulator
Fiber amplifier, improves peak power, and its output accesses second phase modulator, most of work is separated in the second optical fiber splitter again
For the pulse laser of output.
The pulse laser and first that another part narrow linewidth pulse laser seeds source that first optical fiber splitter separates is sent
Another part this laser output signal power that optical fiber splitter separates is identical, while carries out relevant inspection into fibre optic interferometer
Survey, the beat signal of the relevant gained of fibre optic interferometer output two bundle of pulsed laser, through photodetector opto-electronic conversion, electric signal connects
Enter control circuit, control circuit detects the difference frequency and beat frequency intensity of beat signal, and the difference frequency of the beat signal is frequency
The working frequency in rate source；Control circuit continuously adjusts optical fiber phase shifter phase place change to π or ± pi/2, monitors the change of beat frequency intensity
Change, be exactly that the phase difference of two phase-modulators is π odd-multiple, second phase modulator is to entering when beat frequency intensity minimum
The pulse laser entered carries out 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 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.
Control circuit persistently monitors the change of beat frequency intensity, when laser temperature change or extraneous vibration, may cause
Laser works phase drift, beat frequency Strength Changes, control circuit adjust optical fiber phase shifter in real time, and beat frequency intensity is locked in most
Small state, the pulse laser spectrum of output are compressed to minimum, persistently export the narrow linewidth fiber pulse laser of high-peak power.
Compared with prior art, the beneficial effect of the narrow linewidth fiber pulse laser of a kind of high-peak power of the utility model
Fruit is：1st, narrow-linewidth laser pulse is overcome peak power output is limited by SBS threshold during fiber amplifier the shortcomings that,
The maximum output peak power of narrow linewidth fiber pulse laser is improved, while ensures that pulse laser narrow linewidth characteristic is constant,
The peak power for the pulsewidth 100ns level pulse laser that can be achieved pulse laser exporting peak power 200W or so brings up to thousand
Watt level, reaches as high as 10kW or so excited Raman threshold value, and line width then can be controlled in below 1MHz, ensures that the height of laser is concerned with
Performance；2nd, real-time monitoring laser temperature change and extraneous vibration cause laser works phase drift, adjust optical fiber in time and move
Phase device, laser pulse light spectrum compression effectiveness is kept 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.
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 access first phase modulator, the soft exchange fibre optic interferometer of another way 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, compressed spectrum, finally enters the second optical fiber
Shunt, 99% light is 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 caused beat signal is visited through photoelectricity
Device opto-electronic conversion, electric signal Access Control circuit are surveyed, the control signal of control circuit connects optical fiber phase shifter and radio frequency amplifier,
Control circuit controls optical fiber phase shifter and radio frequency amplifier to 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 are：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.
Above-described embodiment, only the purpose of this utility model, technical scheme and beneficial effect are further described
Specific case, the utility model are not limited to this.All any modifications made within scope of disclosure of the present utility model,
Equivalent substitution, improvement etc., are all contained within the scope of protection of the utility model.
Claims (9)
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 way 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, the second optical fiber splitter is finally entered, 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 carry out phase in fibre optic interferometer
Dry detection, caused beat signal 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, first phase modulator and second phase modulator are driven 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 connect electric light and 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 is than defeated
Go out an input arm of end connection 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 low numerical aperture for the two-stage or 3-stage optical fiber amplifier, final amplifier therein of cascade
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, another input arm of the less power laser connection fibre optic interferometer of ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720665989.7U CN206850215U (en) | 2017-06-08 | 2017-06-08 | A kind of narrow linewidth fiber pulse laser of high-peak power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720665989.7U CN206850215U (en) | 2017-06-08 | 2017-06-08 | A kind of narrow linewidth fiber pulse laser of high-peak power |
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| Publication Number | Publication Date |
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| CN206850215U true CN206850215U (en) | 2018-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720665989.7U Withdrawn - After Issue CN206850215U (en) | 2017-06-08 | 2017-06-08 | A kind of narrow linewidth fiber pulse laser of high-peak power |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107086428A (en) * | 2017-06-08 | 2017-08-22 | 中国电子科技集团公司第三十四研究所 | The narrow linewidth fiber pulse laser and its application method of a kind of high-peak power |
-
2017
- 2017-06-08 CN CN201720665989.7U patent/CN206850215U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107086428A (en) * | 2017-06-08 | 2017-08-22 | 中国电子科技集团公司第三十四研究所 | The narrow linewidth fiber pulse laser and its application method of a kind of high-peak power |
| CN107086428B (en) * | 2017-06-08 | 2023-06-09 | 中国电子科技集团公司第三十四研究所 | High-peak-power narrow linewidth fiber pulse laser and application method thereof |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180105 Effective date of abandoning: 20230609 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20180105 Effective date of abandoning: 20230609 |