CN104242028A - Feedback type high-peak-power picosecond-pulse fiber laser system - Google Patents
Feedback type high-peak-power picosecond-pulse fiber laser system Download PDFInfo
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- CN104242028A CN104242028A CN201410484592.9A CN201410484592A CN104242028A CN 104242028 A CN104242028 A CN 104242028A CN 201410484592 A CN201410484592 A CN 201410484592A CN 104242028 A CN104242028 A CN 104242028A
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Abstract
The invention relates to a feedback type high-peak-power picosecond-pulse fiber laser system. A pulse shaping unit is added to the rear of a seed source to shape pulses, the pulse width of the seed source is compressed, the waveform of the seed source is improved, and the quality of seed light is improved. A fiber isolator and a narrow-band filter are connected to the front of a pre-amplifier stage and the front of a main amplifier stage respectively, harmful ASE is filtered out, and the stability of the system is improved. A red light indicator is added between the pre-amplifier stage and the main amplifier stage, and thus the safety and the flexibility of operation on a laser are improved. Photodiodes are connected to the rear of the seed source and the rear of the main amplifier stage respectively, and real-time protection and dynamic power regulation of the laser are achieved through a master control unit. The feedback type high-peak-power picosecond-pulse fiber laser system is an all-fiber system, and thus the mechanical stability and the adaptability to the environment of the system can be effectively improved. The quality of light beams of the laser is improved through a fiber grating, the narrow-band filter and a pattern adapter, the nonlinear effect in a doped fiber is effectively suppressed, and high-peak-power picosecond-pulse laser output is achieved.
Description
Technical field
The present invention relates to fiber laser field, specifically a kind of reaction type high-peak power Picopulse optical fiber laser system.
Background technology
High power Picopulse optical fiber laser have good beam quality, pulse duration narrow, can burn material " cold ", reliability is high, it is integrated to be easy to, more and more paid close attention to without the need to advantages such as complex maintenance and apply, especially micro-scale material processing field.
Present stage obtains the picopulse of high-peak power mainly through master oscillator-amplification (MOPA) method, seed source MO generally adopts the semiconductor laser modulation of fast response time to produce the seed light that pulse duration is picosecond magnitude, and seed light is injected in amplifier PA amplifies.Although adopt short pulse to drive semiconductor laser to obtain short-pulse laser, spectral width is narrower, if do not add process, make pulse stretching, Noise enhancement, limiting the raising of peak laser power when amplifying again.
In the long-time use procedure of laser, the device temperature influence such as pumping semiconductor laser there will be power fluctuation, and directly have influence on the stability of laser output power, laser processing technology same effect, integrality etc. can not reach requirement.
Summary of the invention
The problems referred to above that object of the present invention exists to overcome prior art, provide the high-peak power picosecond pulse laser system that a kind of good beam quality, peak power are high, seed source state can be monitored, output power stability dynamic regulates.
Technical scheme of the present invention:
A kind of reaction type high-peak power Picopulse optical fiber laser system, is made up of seed source, pulse shaping unit, flashlight watch-dog, isolator, pre-amplification stage, narrow band filter, ruddiness male part, main amplifying stage, power monitor, output optical isolator, main control unit, driver element, feedback unit; It is characterized in that: main control unit is connected with feedback unit with driver element respectively, driver element controls seed source, pre-amplification stage, main amplifying stage respectively; Drive unit drives seed source exports picosecond magnitude seed light; Seed light is fraction light arriving signal light watch-dog after pulse shaping unit, overwhelming majority light is injected into pre-amplification stage again after isolator, again successively by narrow band filter, ruddiness male part, main amplifying stage, most laser that main amplifying stage exports export from output optical isolator, and small part laser arrives power monitor; The signal collected is sent to feedback unit by flashlight watch-dog and power monitor, feeds back to main control unit by feedback unit; The flashlight frequency collected, pulse duration or spectral width parameter and set point contrast by main control unit, determine that seed source continues or quits work according to comparing result; The power signal collected and set point are contrasted, increases the pumping current of pre-amplification stage and main amplifying stage according to comparing result by driver element or seed source quits work.
Described seed source is the gain switch type semiconductor laser of response fast, and driver element produces pulse current and drives seed source to produce picopulse flashlight.
Described seed source also comprises the fiber grating of centre wavelength at 1064 ± 2nm, makes flashlight have higher signal to noise ratio and narrower live width.
Described pulse shaping unit is made up of optical fiber circulator and chirp grating, and chirp grating changes the intrinsic chirp of seed source output signal light, thus realizes improving impulse waveform, compression pulse width, obtains the flashlight that most short pulse duration is about 50ps.
Described pre-amplification stage front-end and back-end arrange isolator and filter respectively, prevent the stability of amplified spontaneous emission source (ASE) influential system.
Described pre-amplification stage is made up of dual-stage amplifier and fibre optic isolater, and amplifier adopts backward pumping mode, adds fibre optic isolater between two-stage; Every grade of amplifier is made up of coupler, 976nm pumping source and single mode gain fibre.
Described main amplifying stage is made up of coupler, 976nm pumping source and large mould area double-cladding Yb-doped fiber, mode adaptation device MFA, adopts reverse covering pump mode.Main amplifying stage front end is coupled into ruddiness, strengthen system can handling and fail safe.Main amplifying stage adopts large mould area double-cladding Yb-doped fiber, for mating with pre-amplification stage optical fiber, improving the beam quality of system, adding mode adaptation device MFA before main amplifying stage.
Beam splitter by having certain splitting ratio in flashlight watch-dog separates small part flashlight for pilot signal light frequency, pulse duration or spectral width.
Beam splitter by having certain splitting ratio in power monitor separates small part flashlight for laser power monitor.
In power monitor, utilize pigtailed photodiode to convert the light signal collected to the corresponding signal of telecommunication.
The present invention adopts master oscillator structure for amplifying, adds chirp grating paired pulses and carries out shaping, improve seed source waveform after seed source, ensures seed source pulse duration, improves seed source quality.Before pre-amplification stage and main amplifying stage, access isolator and narrow band filter respectively, the ASE that filtering is harmful, improve the stability of system.Between pre-amplification stage and main amplifying stage, add ruddiness instruction, improve processing safety and the flexibility of laser.All access photodiode after seed source He after main amplifying stage, realize the monitoring of flashlight frequency, pulse duration or spectral width by feedback unit and carry out dynamic adjustments to laser real-time guard and to power output.This kind of Picopulse optical fiber laser maximum power output 20W, minimum pulse width is 50ps, and frequency can in the wider scope internal modulation of 10kHz to 1MHz, and single pulse energy reaches as high as 1.5mJ, peak power 40KW.
Operation principle of the present invention: drive unit drives seed source produces frequency can at the flashlight of the wider scope internal modulation of 10kHz to 1MHz, minimum through shaping afterpulse width is 50ps, flashlight is injected into pre-amplification stage after isolator, pre-amplification stage backward pumping is injected into main amplifying stage after tentatively amplifying flashlight again after narrow band filter filtering, ruddiness coupling, main amplifying stage backward pumping amplifies further to laser, exports finally by output optical isolator.Reaction type high-peak power Picopulse optical fiber laser Operation system setting seed source flashlight watch-dog and power output watch-dog, light signal is converted to the signal of telecommunication by pigtailed photodiode, it and set point contrast by main control unit, make corresponding judgement and adjusted by feedback circuit according to comparing result.
Advantage of the present invention:
Described reaction type high-peak power Picopulse optical fiber laser system is all optical fiber system, effectively improves the mechanical stability of system and the adaptive capacity to environment;
Described reaction type high-peak power Picopulse optical fiber laser system utilizes chirp grating, narrow band filter and mode adaptation device to improve the beam quality of laser, and effectively suppress the nonlinear effect in doped fiber, realize high-peak power picosecond pulse laser and export;
Described reaction type high-peak power Picopulse optical fiber laser system has the function of ruddiness instruction, improves operability and the fail safe of system;
Described reaction type high-peak power Picopulse optical fiber laser system has the function of function that flashlight monitors in real time and power output dynamic adjustments.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is optical texture schematic diagram of the present invention.
Embodiment
Further describe below in conjunction with accompanying drawing.
See Fig. 1, the present invention is made up of seed source 1, pulse shaping unit 2, flashlight watch-dog 3, isolator 4, pre-amplification stage 5, narrow band filter 6, ruddiness male part 7, main amplifying stage 8, power monitor 9, output optical isolator 10, main control unit 11, driver element 12, feedback unit 13; It is characterized in that: main control unit 11 is connected with feedback unit 13 with driver element 12 respectively, driver element 12 controls seed source 1, pre-amplification stage 5, main amplifying stage 8 respectively; Driver element 12 drives seed source 1 to export picosecond magnitude seed light; Seed light is fraction light arriving signal light watch-dog 3 after pulse shaping unit 2, overwhelming majority light is injected into pre-amplification stage 5 again after isolator 4, again successively by narrow band filter 6, ruddiness male part 7, main amplifying stage 8, most laser that main amplifying stage 8 exports export from output optical isolator 10, and small part laser arrives power monitor 9; The signal collected is sent to feedback unit 13 by flashlight watch-dog 3 and power monitor 9, feeds back to main control unit 11 by feedback unit 13; The flashlight frequency collected, pulse duration or spectral width parameter and set point contrast by main control unit 11, determine that seed source 1 continues or quits work according to comparing result; The power signal collected and set point are contrasted, increases the pumping current of pre-amplification stage 5 and main amplifying stage 8 according to comparing result by driver element 12 or seed source 1 quits work.
Described driver element 12 drives seed source 1 to produce picosecond magnitude flashlight; Flashlight is divided into two parts by 1:99 beam splitter again by flashlight after pulse shaping unit 2 shaping, see Fig. 2, described seed source 1 is the gain switch type semiconductor laser 101 of fast response, centre wavelength forms at the fiber grating 102 of 1064 ± 2nm, driver element 12 produces pulse current and drives gain switch type semiconductor laser 101 to produce picopulse flashlight, and fiber grating 102 makes flashlight have higher signal to noise ratio and narrower live width; Described pulse shaping unit 2 is made up of optical fiber circulator 201 and chirp grating 202, and chirp grating 202 changes the intrinsic chirp of seed source output signal light, thus reaches the object improving impulse waveform, compression pulse width; Sub-fraction light arriving signal light watch-dog 3, described light watch-dog 3 is made up of beam splitter and pigtailed photodiode 302, and most light is injected into pre-amplification stage 5 through fibre optic isolater 4 again; Pre-amplification stage 5 is made up of dual-stage amplifier and fibre optic isolater 403, and amplifier adopts backward pumping mode, adds fibre optic isolater 403 between two-stage; First order amplifier is made up of coupler 402,976nm pumping source LD406 and single mode gain fibre 401, and second level amplifier is made up of another coupler 405, another 976nm pumping source LD407 and another single mode gain fibre 404; Two-stage prime amplifier also can share a 976nm pumping source, provides pump energy by giving first order pre-amplification and second level pre-amplification after the light splitting of 35:65 beam splitter respectively; Pre-amplification stage 5 Output of laser injects main amplifying stage 8 after narrow band filter 6 filtering.For improving operability and the fail safe of system, can add ruddiness male part 7 by 1064/633nmWDM between filter 6 and main amplifying stage 8 and be coupled into ruddiness, described ruddiness male part 7 is made up of coupler 701, ruddiness pumping source LD702.Described main amplifying stage is made up of coupler 801,976nm pumping source LD804 and large mould area double-cladding Yb-doped fiber 802, mode adaptation device MFA803, adopts reverse covering pump mode.The Output of laser of main amplifying stage 8 is divided into two parts by 1:99 beam splitter, and most laser exports from output optical isolator 10, and small part laser arrives power monitor device 9, and described power monitor device 9 is made up of beam splitter and pigtailed photodiode 902.The signal collected is fed back to main control unit 11 through feedback unit 13 by flashlight watch-dog 3 and power monitor 9; The flashlight frequency collected, pulse duration or spectral width parameter and set point contrast by main control unit 11, determine that seed source 1 continues or quits work according to comparing result; The power signal collected and set point are contrasted, determines to increase or reduce pre-amplification stage 5 and main amplifying stage 8 pumping current by driver element 12 according to comparing result, or seed source 1 is quit work.
Main control unit 11 of the present invention, driving unit 12, feedback unit 13 are existing conventional structure, directly buy from market and obtain.
Claims (10)
1. a reaction type high-peak power Picopulse optical fiber laser system, is made up of seed source (1), pulse shaping unit (2), flashlight watch-dog (3), isolator (4), pre-amplification stage (5), narrow band filter (6), ruddiness male part (7), main amplifying stage (8), power monitor (9), output optical isolator (10), main control unit (11), driver element (12), feedback unit (13); It is characterized in that: main control unit (11) is connected with feedback unit (13) with driver element (12) respectively, driver element (12) controls seed source (1), pre-amplification stage (5), main amplifying stage (8) respectively; Driver element (12) drives seed source (1) to export picosecond magnitude seed light; Seed light is fraction light arriving signal light watch-dog (3) after pulse shaping unit (2), overwhelming majority light is injected into pre-amplification stage (5) again after isolator (4), again successively by narrow band filter (6), ruddiness male part (7), main amplifying stage (8), most laser that main amplifying stage (8) exports export from output optical isolator (10), and small part laser arrives power monitor (9); The signal collected is sent to feedback unit (13) by flashlight watch-dog (3) and power monitor (9), feeds back to main control unit (11) by feedback unit (13).
2. reaction type high-peak power Picopulse optical fiber laser system according to claim 1, it is characterized in that, described seed source (1) is the gain switch type semiconductor laser of response fast, and driver element (12) produces pulse current and drives seed source to produce picopulse flashlight.
3. reaction type high-peak power Picopulse optical fiber laser system according to claim 2, is characterized in that, described seed source (1) also comprises the fiber grating of centre wavelength at 1064 ± 2nm.
4. reaction type high-peak power Picopulse optical fiber laser system according to claim 1, is characterized in that, described pulse shaping unit (2) is made up of optical fiber circulator and chirp grating.
5. reaction type high-peak power Picopulse optical fiber laser system according to claim 1, it is characterized in that, described pre-amplification stage is made up of dual-stage amplifier and fibre optic isolater, and amplifier adopts backward pumping mode, adds fibre optic isolater between two-stage; Every grade of amplifier is made up of coupler, 976nm pumping source and single mode gain fibre.
6. reaction type high-peak power Picopulse optical fiber laser system according to claim 1, it is characterized in that, described main amplifying stage is made up of coupler, 976nm pumping source and large mould area double-cladding Yb-doped fiber, mode adaptation device MFA, adopts reverse covering pump mode.
7. reaction type high-peak power Picopulse optical fiber laser system according to claim 1, it is characterized in that, in flashlight watch-dog (3), separate small part flashlight for pilot signal light frequency, pulse duration or spectral width by the beam splitter with certain splitting ratio.
8. reaction type high-peak power Picopulse optical fiber laser system according to claim 1, is characterized in that, in power monitor (9), separate small part flashlight for laser power monitor by the beam splitter with certain splitting ratio.
9. reaction type high-peak power Picopulse optical fiber laser system according to claim 1, is characterized in that, in power monitor (9), utilize pigtailed photodiode to convert the light signal collected to the corresponding signal of telecommunication.
10. reaction type high-peak power Picopulse optical fiber laser system according to claim 1, is characterized in that, described ruddiness male part (7) is made up of coupler, red diodes.
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| CN201410484592.9A CN104242028A (en) | 2014-09-19 | 2014-09-19 | Feedback type high-peak-power picosecond-pulse fiber laser system |
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| CN201410484592.9A CN104242028A (en) | 2014-09-19 | 2014-09-19 | Feedback type high-peak-power picosecond-pulse fiber laser system |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104749193A (en) * | 2015-04-02 | 2015-07-01 | 深圳市斯尔顿科技有限公司 | Device for keeping constant output light power in lens stress detection |
| CN105356205A (en) * | 2015-11-10 | 2016-02-24 | 武汉锐科光纤激光技术股份有限公司 | Long-pulse high-peak-power quasi-continuous fiber laser system |
| CN105680314A (en) * | 2016-03-23 | 2016-06-15 | 武汉锐科光纤激光技术股份有限公司 | High-power nanosecond and picosecond pulse fiber laser system |
| CN106451043A (en) * | 2016-10-31 | 2017-02-22 | 武汉锐科光纤激光技术股份有限公司 | 200W nanosecond pulsed optical fiber laser system |
| CN106785839A (en) * | 2016-12-16 | 2017-05-31 | 中国电子科技集团公司电子科学研究院 | A kind of optical fiber laser with super continuous spectrum |
| CN107346064A (en) * | 2017-06-16 | 2017-11-14 | 中国电子科技集团公司第二十三研究所 | Optical bistability control system, control method and the chip of a kind of electrooptical switching |
| CN109672084A (en) * | 2018-12-24 | 2019-04-23 | 西安飞芯电子科技有限公司 | A kind of radiant output equipment and method |
| CN109687279A (en) * | 2019-01-29 | 2019-04-26 | 苏州迅镭激光科技有限公司 | Pulse optical fiber goes out photocontrol Program Realizing Method |
| CN109687270A (en) * | 2019-01-29 | 2019-04-26 | 深圳市杰普特光电股份有限公司 | Optical fiber laser |
| WO2020248929A1 (en) * | 2019-06-11 | 2020-12-17 | 苏州创鑫激光科技有限公司 | Closed-loop control high-power single-fiber output continuous all-fiber laser system |
| CN113994245A (en) * | 2019-06-18 | 2022-01-28 | 思科技术公司 | Optical fiber array unit with unfinished end face |
| 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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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104749193A (en) * | 2015-04-02 | 2015-07-01 | 深圳市斯尔顿科技有限公司 | Device for keeping constant output light power in lens stress detection |
| CN105356205A (en) * | 2015-11-10 | 2016-02-24 | 武汉锐科光纤激光技术股份有限公司 | Long-pulse high-peak-power quasi-continuous fiber laser system |
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| CN106785839A (en) * | 2016-12-16 | 2017-05-31 | 中国电子科技集团公司电子科学研究院 | A kind of optical fiber laser with super continuous spectrum |
| CN107346064A (en) * | 2017-06-16 | 2017-11-14 | 中国电子科技集团公司第二十三研究所 | Optical bistability control system, control method and the chip of a kind of electrooptical switching |
| CN109672084A (en) * | 2018-12-24 | 2019-04-23 | 西安飞芯电子科技有限公司 | A kind of radiant output equipment and method |
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| CN109687279A (en) * | 2019-01-29 | 2019-04-26 | 苏州迅镭激光科技有限公司 | Pulse optical fiber goes out photocontrol Program Realizing Method |
| CN109687270A (en) * | 2019-01-29 | 2019-04-26 | 深圳市杰普特光电股份有限公司 | Optical fiber laser |
| WO2020248929A1 (en) * | 2019-06-11 | 2020-12-17 | 苏州创鑫激光科技有限公司 | Closed-loop control high-power single-fiber output continuous all-fiber laser system |
| CN113994245A (en) * | 2019-06-18 | 2022-01-28 | 思科技术公司 | Optical fiber array unit with unfinished end face |
| CN113994245B (en) * | 2019-06-18 | 2023-12-12 | 思科技术公司 | Optical fiber array unit with unfinished end face |
| 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 |
| CN114465079B (en) * | 2022-01-26 | 2023-10-27 | 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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