CN105140762B - A kind of pulse optical fiber of semiconductor laser seed source - Google Patents
A kind of pulse optical fiber of semiconductor laser seed source Download PDFInfo
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- CN105140762B CN105140762B CN201510458765.4A CN201510458765A CN105140762B CN 105140762 B CN105140762 B CN 105140762B CN 201510458765 A CN201510458765 A CN 201510458765A CN 105140762 B CN105140762 B CN 105140762B
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- pulse
- optical fiber
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- spectrum widening
- laser amplifier
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Abstract
The present invention is suitable for laser technology field, provide a kind of pulse optical fiber, including sequentially connected pulse laser emission device, prime laser amplifier, spectrum widening line and rear class laser amplifier, the light pulse that prime laser amplifier exports pulse laser emission device amplifies, amplified light pulse generates the nonlinear effect including at least stimulated Brillouin scattering and Raman scattering in spectrum widening line, make the spectrum widening of light pulse, its wavelength is to long wave length direction frequency displacement, rear class laser amplifier amplifies the light pulse after realization spectrum widening, obtain burst pulse.Spectrum widening line is arranged in the present invention between prime laser amplifier and rear class laser amplifier, realize spectrum widening, avoid huge pulse and frequency hole burning, and amplify afterpulse to be narrowed, form the burst pulse of high-peak power, high single pulse energy, and cost and the requirement to pulse laser emission device can be reduced, and improves reliability.
Description
Technical field
The invention belongs to laser technology field, in particular to a kind of pulsed optical fibre laser of semiconductor laser seed source
Device.
Background technique
Optical fiber laser is widely used in the industrial circles such as industrial welding, cutting, mark, engraving, and medical, free
The fields such as space propagation, military affairs, sensing.Especially pulse optical fiber is widely used popularization in recent years.MOPA
The pulse optical fiber of (master oscillator power amplification) structure is one of main product currently on the market, this laser one
As using semiconductor laser as laser seed source, but since the line width of semiconductor laser is relatively narrow (usually several to receive
Rice), the nonlinear effects such as stimulated Brillouin scattering (SBS), excited Raman (SRS) are easily generated in the amplifier below, and
The laser threshold for generating SBS is lower, huge random short so as to cause peak power is generated in a fiber in low laser power
Pulse, this random short pulse are the major reasons for causing optical fiber laser to damage.Thus, it is thus proposed that use variable period optical fiber
The line width of grating (Chirped Fiber Bragg Grating) noise spectra of semiconductor lasers seed is broadened, and is put to reduce
Nonlinear effect in big device.But the method for this service life changeable optical fiber grating has high want to the design of grating
It asks, the variation of semiconductor laser seed source wavelength also results in the mismatch of variable period fiber grating, is especially using nothing
When refrigeration semiconductor laser seed source, the wavelength of semiconductor laser seed source is changed greatly with operating ambient temperature, optical fiber
Grating can not play a role at all.
In the application aspect of pulse laser, in one timing of mean power of pulse optical fiber, in order to improve pulse
Peak power and single pulse energy need optical fiber laser work in low-repetition-frequency and narrow pulse width.This is just to optical fiber
Core diameter proposes requirement, that is, requires the core diameter of optical fiber cannot be too thin, otherwise can be easy to produce in a fiber nonlinear effect to
Damage optical fiber.But the output facula quality that the optical fiber of thick core diameter will lead to optical fiber laser again is deteriorated, so as to cause processing essence
The reduction of degree.How to reduce pulse recurrence frequency, raising pulse peak power and single pulse energy is pulse optical fiber
One of difficult point.The MOPA pulse laser of common semiconductor laser seed source generally repeats frequency using raising is minimum in the market
Rate or the method for reducing average output power solve the above problems, but will be to reduce average output power as cost, still
It is not ideal solution.
Summary of the invention
The purpose of the present invention is to provide a kind of narrow pulse fiber lasers, it is intended to effectively inhibit huge pulse, and have
While effect obtains low pulse repetition frequency, narrow pulse width, pulse peak power and single pulse energy are improved.
The invention is realized in this way a kind of pulse optical fiber, including it is sequentially connected pulse laser emission device, preceding
Grade laser amplifier, spectrum widening line and rear class laser amplifier, the prime laser amplifier is to the pulse laser emission
The light pulse of device output amplifies, and amplified light pulse generates in the spectrum widening line includes at least excited Brillouin
The nonlinear effect of scattering and Raman scattering, makes the spectrum widening of the light pulse, wavelength is described to long wave length direction frequency displacement
Rear class laser amplifier amplifies the light pulse after realization spectrum widening, and enlarge-effect concentrates on the starting of light pulse
Edge obtains wide range burst pulse.
Spectrum widening line is arranged in the present invention between prime laser amplifier and rear class laser amplifier, passes through prime laser
Amplifier by Optical pulse amplification to a certain extent after, be allowed to realize nonlinear effect in spectrum widening line, realize spectrum widening,
Make energy dispersed distribution in compared with wide spectral range, then amplified by rear class laser amplifier, reduces spectral energy density, avoid
Huge pulse and frequency hole burning protect laser；And amplifies afterpulse to be narrowed, form high-peak power, high single pulse energy
The burst pulse of amount.The pulse optical fiber does not need the wide line broad pulse semiconductor hard to find in the market compared with traditional technology
Laser emitter does not need the mechanical periodicity fiber grating of stretched-out spectrum, do not need increase optical fiber laser amplifier gain or
Quantity reduces costs, and improves the reliability of system；The repetition rate for not needing increase input optical signal, is not required to reduce
Average output power；It is not required to improve the performance requirement to pulse laser emission device.It is that one kind can effectively inhibit huge pulse, have
Effect narrows pulsewidth and improves the optical fiber laser of pulse peak power and single pulse energy.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of pulse optical fiber provided in an embodiment of the present invention；
Fig. 2 is the working principle diagram of pulse optical fiber provided in an embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Specific implementation of the invention is described in detail below in conjunction with specific embodiment:
Referring to FIG. 1, the embodiment of the present invention provides a kind of pulse optical fiber, including sequentially connected pulse laser hair
Emitter 1, prime laser amplifier 2, spectrum widening line 3 and rear class laser amplifier 4, prime laser amplifier 2 is to pulse laser
The light pulse that transmitter 1 exports amplifies, and amplified light pulse, which generates to include at least in spectrum widening line 3, to be excited in cloth
The nonlinear effects such as deep pool scattering and Raman scattering, make the spectrum widening of light pulse, and wavelength swashs to long wave length direction frequency displacement, rear class
4 pairs of image intensifer are realized that the light pulse after spectrum widening amplifies, and enlarge-effect concentrates on the starting edge of light pulse, obtains
Obtain wide range burst pulse.
With further reference to Fig. 2, such as a figure in Fig. 2, pulse laser emission device 1 exports 1064nm square pulse, width 100
~200ns is adjustable, and by taking 150ns as an example, modulation repetition rate 20KHz~1MKz is adjustable；
Such as the b figure in Fig. 2, prime laser amplifier 2 by the Optical pulse amplification, after amplification mean power be 400mW~
1500mW, light impulse length are held essentially constant, and amplified light pulse is rearwardly in faint downward trend by wavefront, in light
A small amount of stimulated Brillouin scattering light spectrum (broadening of central wavelength line width) and fainter stimlated Raman spectrum are generated in spectrum, so that
Pulse spectrum is slight widening；
Such as the c figure in Fig. 2, the light pulse being amplified enters spectrum widening line 3, since its peak power is sufficiently high, makes it
The nonlinear effects such as stronger stimulated Brillouin scattering, Raman scattering are generated in spectrum widening line 3, its waveform is made to change
It is broadened to long wave length direction, Energy distribution is in broader spectral region；
Such as the d figure in Fig. 2, rear class laser amplifier 4 is entered by the light pulse that spectrum widening line 3 exports, starting is along suction
Received a large amount of carrier, be greatly amplified the starting of light pulse along nearby, and subsequent power be amplified degree very little can be with
Ignore, and then narrow effective pulse width, improves pulse peak power and single pulse energy.By rear class laser amplifier
After 4, light pulse is amplified to the average light power of 20W, and amplification afterpulse width can be narrowed to 50ns or less.Due to entering
The optical pulse energy dispersed distribution of the rear class laser amplifier 4 can be avoided and put in rear class laser in wider spectral region
Occurrence frequency hole burning event in big device 4.
Pulse optical fiber provided in an embodiment of the present invention prime laser amplifier 2 and rear class laser amplifier 4 it
Between be arranged spectrum widening line 3, by prime laser amplifier 2 by Optical pulse amplification to a certain extent after, be allowed in spectrum widening
Nonlinear effect is realized in line 3, spectrum widening is realized, makes energy dispersed distribution in compared with wide spectral range, then is swashed by rear class
Image intensifer 4 amplifies, and reduces spectral energy density, avoids huge pulse and frequency hole burning, protects laser；And arteries and veins after amplifying
Punching is narrowed, and the burst pulse of high-peak power, high single pulse energy is formed.The pulse optical fiber compared with traditional technology,
The wide line broad pulse semiconductor laser transmitter hard to find in the market is not needed, the mechanical periodicity optical fiber light of stretched-out spectrum is not needed
Grid do not need the gain or quantity that increase optical fiber laser amplifier, reduce costs, and improve the reliability of system；It is not required to
The repetition rate for increasing input optical signal is not required to reduce average output power；It is not required to improve the property to pulse laser emission device
It can require.It is that one kind can effectively inhibit huge pulse, effectively narrow pulsewidth and improve pulse peak power and single pulse energy
Optical fiber laser.
For more stages tandem type pulse optical fiber and amplifier system, introducing the spectrum widening line 3 can be effective
Ground inhibits the appearance of random huge pulse, defeated to the narrow pulse width laser for obtaining high impulse peak power and high single pulse energy
It is very effective out.
In the present embodiment, spectrum widening degree of the light pulse in spectrum widening line 3 is the intensity by nonlinear effect
It influences, nonlinear effect intensity is bigger, and spectrum widening is bigger, and nonlinear effect is power, the light by input optical pulse
What the length and core diameter of spectrum widening line 3 determined, core diameter is thinner, length is longer, input power is bigger, and nonlinear effect is stronger.Cause
This, can adjust the length of spectrum widening line 3, made a reservation for according to the amplified average light power of prime laser amplifier 2
In the case where the nonlinear effect of intensity, light pulse peak power is higher, and the length of spectrum widening line 3 can be shorter, otherwise light
Pulse peak power is lower, and spectrum widening line 3 just needs longer.Certainly, it improves light pulse peak power and extends spectrum widening
The length of line 3 can enhance nonlinear effect, in practice, usually by light pulse peak power can magnification level and spectrum
The length cost and wire structures for broadening line 3 comprehensively consider.In addition, nonlinear effect is stronger, caused spectrum widening is also got over
Greatly, which not will lead to the huge light pulse for existing in final output light pulse and occurring at random usually, generate
It negatively affects minimum.Especially when modulating frequency is lower, output power is larger, such as 20KHz modulating frequency, 20W is averagely exported
Power, effect are obvious.
Specifically, the width of 1 output optical pulse of pulse laser emission device is 100ns~500ns, lowest modulation frequency
20KHz.The length of spectrum widening line 3 is 30~60m, using single mode optical fiber, preferably Hi1060 optical fiber or Hi1060flex light
It is fine.The average output power of prime laser amplifier 2 is 400mW~1500mW.The light pulse that rear class laser amplifier 4 exports
Peak power is 15KW or more, and pulse width is 50ns hereinafter, single pulse energy is 0.5mJ or more.
It is further preferred that the width of 1 output optical pulse of pulse laser emission device is 150ns, lowest modulation frequency
20KHz, pulse width 150ns；The average output power of prime laser amplifier 2 is 700mW；The length of spectrum widening line 3
For 40m, the core diameter of spectrum widening line 3 is 6 microns；After rear class laser amplifier 4, the pulse of light pulse can be obtained
Width is 40ns, repetition rate 20KHz, average output power 20W, and peak power is 15KW or more, and single pulse energy is
0.5mJ or more.
Above-mentioned specific data are an effect preferred embodiment of the invention, and the present invention is not limited to the above embodiment.
In the present embodiment, which specifically can be the MOPA pulsed light of semiconductor laser seed source
Fibre laser.Pulse laser emission device 1 can use impulse semiconductor laser, be also possible to the Q impulse light of outer cavity modulation
Fine laser emitter.
With further reference to Fig. 1, prime laser amplifier 2 includes that beam is closed in the pumping of sequentially connected first pumping source 21, first
Device 22 and the first Active Optical Fiber 23 for adulterating gain media；One end that first pump combiner 22 connects the first pumping source 21 is direct
Or it is indirectly connected with the output optical fibre of pulse laser emission device 1,23 direct or indirect connection spectrum widening line 3 of the first Active Optical Fiber
Input terminal.Rear class laser amplifier 4 includes the second pumping source 41, the second pump combiner 42 and adulterates second having for gain media
Source optical fiber 43；Second pump combiner 42 connects the defeated of one end direct or indirect connection spectrum widening line 3 of the second pumping source 41
Outlet.It is pumping source that 915nm multimode laser, which can be used, in prime laser amplifier 2 and rear class laser amplifier 4, total using erbium ytterbium
Mixing active double clad fiber is Active Optical Fiber.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of pulse optical fiber, which is characterized in that including sequentially connected pulse laser emission device, prime laser amplifier
Device, spectrum widening line and rear class laser amplifier, the light that the prime laser amplifier exports the pulse laser emission device
Pulse amplifies, and generative center wavelength line spreads width, is distributed in the power dissipation of the light pulse compared with wide spectrum model
In enclosing, and the light impulse length remains unchanged, amplified light pulse is generated in the spectrum widening line including at least by
The nonlinear effect for swashing Brillouin scattering and Raman scattering, makes the spectrum widening of the light pulse, and wavelength is to long wave length direction
Frequency displacement, the rear class laser amplifier amplifies the light pulse after realization spectrum widening, and enlarge-effect concentrates on light
The starting edge of pulse obtains wide range burst pulse.
2. pulse optical fiber as described in claim 1, which is characterized in that the length of the spectrum widening line be 30~
60m。
3. pulse optical fiber as claimed in claim 2, which is characterized in that the average output of the prime laser amplifier
Power is 400mW~1500mW.
4. pulse optical fiber as claimed in claim 2, which is characterized in that the pulse laser emission device output optical pulse
Width be 100ns~500ns, lowest modulation frequency 20KHz.
5. pulse optical fiber as claimed in claim 2, which is characterized in that the light arteries and veins of the rear class laser amplifier output
The peak power of punching is 15KW or more, and pulse width is 50ns hereinafter, single pulse energy is 0.5mJ or more.
6. pulse optical fiber as claimed in any one of claims 1 to 5, which is characterized in that the pulse laser emission device
The width of output optical pulse is 150ns, lowest modulation frequency 20KHz, pulse width 150ns；The prime laser amplifier
Average output power be 700mW；The length of the spectrum widening line is 40m, and the core diameter of the spectrum widening line is 6 micro-
Rice；The pulse width of the light pulse of the rear class laser amplifier output is 40ns, repetition rate 20KHz, average output work
Rate is 20W.
7. pulse optical fiber as described in claim 1, which is characterized in that the light arteries and veins of the prime laser amplifier output
The power of punching is bigger, and the length of the spectrum widening line is shorter.
8. pulse optical fiber as described in claim 1, which is characterized in that the spectrum widening line uses Hi1060 optical fiber
Or Hi1060flex optical fiber.
9. pulse optical fiber as described in claim 1, which is characterized in that the pulse laser emission device is that pulse is partly led
Volumetric laser transmitter or the Q impulse optical-fiber laser transmitter of outer cavity modulation.
10. pulse optical fiber as described in claim 1, which is characterized in that the pulse optical fiber is semiconductor
The MOPA pulse optical fiber of laser seed source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510458765.4A CN105140762B (en) | 2015-07-30 | 2015-07-30 | A kind of pulse optical fiber of semiconductor laser seed source |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510458765.4A CN105140762B (en) | 2015-07-30 | 2015-07-30 | A kind of pulse optical fiber of semiconductor laser seed source |
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| CN105140762A CN105140762A (en) | 2015-12-09 |
| CN105140762B true CN105140762B (en) | 2018-12-07 |
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| CN201510458765.4A Expired - Fee Related CN105140762B (en) | 2015-07-30 | 2015-07-30 | A kind of pulse optical fiber of semiconductor laser seed source |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107768973A (en) * | 2017-11-14 | 2018-03-06 | 电子科技大学 | It is a kind of can precision tuning Brillouin's multi-wavelength optical fiber laser |
| CN110571634B (en) * | 2019-08-12 | 2021-02-12 | 武汉光迅科技股份有限公司 | Optical signal output device and method, and storage medium |
| CN113140953B (en) * | 2021-03-31 | 2022-06-28 | 深圳市欧凌镭射科技有限公司 | Laser signal control method and device, laser and readable storage medium |
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| CN103022861A (en) * | 2011-09-28 | 2013-04-03 | 中国科学院西安光学精密机械研究所 | All-positive dispersion dissipative nanosecond pulse shapeable passive mode-locked fiber laser system |
| CN103314486A (en) * | 2010-09-13 | 2013-09-18 | 卡尔曼光纤股份有限公司贸易用名卡尔曼激光 | Generating laser pulses based on chirped pulsed amplification |
| CN103730822A (en) * | 2013-12-19 | 2014-04-16 | 中国科学院西安光学精密机械研究所 | Ultrashort pulse optical fiber laser system |
| CN103825164A (en) * | 2013-12-03 | 2014-05-28 | 上海交通大学 | High average power full optical fiber intermediate infrared supercontinuum light source |
| CN204118458U (en) * | 2014-08-20 | 2015-01-21 | 广东高聚激光有限公司 | A kind of single mode full-optical-fiber laser |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7508853B2 (en) * | 2004-12-07 | 2009-03-24 | Imra, America, Inc. | Yb: and Nd: mode-locked oscillators and fiber systems incorporated in solid-state short pulse laser systems |
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2015
- 2015-07-30 CN CN201510458765.4A patent/CN105140762B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103314486A (en) * | 2010-09-13 | 2013-09-18 | 卡尔曼光纤股份有限公司贸易用名卡尔曼激光 | Generating laser pulses based on chirped pulsed amplification |
| CN103022861A (en) * | 2011-09-28 | 2013-04-03 | 中国科学院西安光学精密机械研究所 | All-positive dispersion dissipative nanosecond pulse shapeable passive mode-locked fiber laser system |
| CN103825164A (en) * | 2013-12-03 | 2014-05-28 | 上海交通大学 | High average power full optical fiber intermediate infrared supercontinuum light source |
| CN103730822A (en) * | 2013-12-19 | 2014-04-16 | 中国科学院西安光学精密机械研究所 | Ultrashort pulse optical fiber laser system |
| CN204118458U (en) * | 2014-08-20 | 2015-01-21 | 广东高聚激光有限公司 | A kind of single mode full-optical-fiber laser |
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