CN111082292A - Quasi-continuous or continuous chirp pulse amplified fiber laser system - Google Patents

Quasi-continuous or continuous chirp pulse amplified fiber laser system Download PDF

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Publication number
CN111082292A
CN111082292A CN201911247861.9A CN201911247861A CN111082292A CN 111082292 A CN111082292 A CN 111082292A CN 201911247861 A CN201911247861 A CN 201911247861A CN 111082292 A CN111082292 A CN 111082292A
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China
Prior art keywords
pulse
continuous
repetition frequency
quasi
stretcher
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CN201911247861.9A
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Inventor
冷雨欣
龙应斌
彭宇杰
庞盟
张宗昕
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Shanghai Institute of Optics and Fine Mechanics of CAS
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Shanghai Institute of Optics and Fine Mechanics of CAS
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H01S3/06758—Tandem amplifiers
    • 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
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
    • 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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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)

Abstract

The invention discloses a quasi-continuous or continuous chirp pulse amplified fiber laser system, which comprises a high repetition frequency seed source, a pulse stretcher, a chirp pulse amplifier, a high power collimator and a high power pulse width compressor which are connected in sequence, wherein a femtosecond or picosecond oscillator with repetition frequency of hundreds of MHz to GHz is used as the seed source, the pulse stretcher is used for stretching the pulse to hundreds of picoseconds to tens of nanoseconds, then the high repetition frequency seed pulse is amplified to kilowatt and ten kilowatt level output through a multistage amplification technology, and finally the pulse is compressed to femtosecond or picosecond level through the pulse width compressor. The invention has the characteristics of realizing ultrafast laser output with high power, high repetition frequency and large energy, quasi-continuous or continuous chirped pulse amplification and the like, and is suitable for developing ultrafast lasers with high power, high repetition frequency and large energy.

Description

Quasi-continuous or continuous chirp pulse amplified fiber laser system
Technical Field
The invention belongs to the technical field of laser, and particularly relates to a quasi-continuous or continuous chirped pulse amplification optical fiber laser system.
Background
The fiber laser with high repetition frequency, high power and ultrafast has important application in the industrial and scientific research fields, such as material processing, micro-nano processing, cold processing and the like in industry, and can be used in the fields of optical parametric pump sources, generation of higher harmonics and attosecond research in scientific research. The fiber laser is pursued in the market due to the characteristics of compact structure, high stability, good beam quality, high conversion efficiency and the like, and the application of the fiber laser is more and more extensive no matter in the fields of industrial application, scientific research, national defense and military industry, medical treatment and the like.
Because the seed source laser has extremely narrow pulse width time, after passing through the chirped pulse amplifier, the seed source laser can reach extremely high peak power at very low average power, so that various nonlinear effects of the optical fiber are caused, so that the conventional general seed source and optical fiber amplifier (MOPA) mode cannot obtain high-average-power pulse output, and the pulse amplification technology is a classical mode for obtaining high-energy strong laser output.
One of the key technologies of the pulse amplifier is the stretcher, and the amount of chirp introduced by the pulse stretcher directly determines the effect of the subsequent chirped pulse amplifier on completing linear chirp amplification and recovering the pulse by the pulse compressor.
One of the key technologies of the pulse amplifier is that a seed source, the characteristics of the seed source, such as single pulse energy, repetition frequency, pulse spectrum width, and the like, directly influence the stretching amount of a subsequent pulse stretcher and the pulse amplification effect of the chirped pulse amplifier.
Although patents CN109004500A and CN205693131U propose chirped pulse fiber amplifiers, only quasi-continuous or continuous pulses with high repetition frequency and large spreading amount can output pulses with large energy, ultrahigh power and high repetition frequency, and pulses formed by the seed source and the stretcher adopted in the above patents cannot realize kilowatt and kilowatt level output; the fiber compressor described in the above patent exhibits significant nonlinear effects when outputting in kilowatts and above, while the fiber conduction output introduces additional dispersion, and the final recovered pulse width cannot be precisely adjusted.
Disclosure of Invention
The chirped pulse fiber laser amplifier aims to overcome the defect that a common fiber pulse laser amplifier cannot achieve high-energy output and simultaneously overcome the defect that the conventional chirped pulse fiber laser amplifier cannot achieve ultrahigh-power and high-energy output. The invention provides a laser system comprising a high repetition frequency seed source, a large-broadening-amount pulse stretcher, a multi-stage chirped pulse amplifier, a high-power collimator and a high-power pulse compressor, wherein the high repetition frequency seed source, the large-broadening-amount pulse stretcher and the high-power compressor are used as core parts of the laser, so that quasi-continuous light or continuous light input is provided for the multi-stage chirped pulse amplifier, and the multi-stage chirped pulse amplifier is ensured to realize stable laser amplification output with large energy, high average power and high repetition frequency.
In order to achieve the above object, the present invention provides a quasi-continuous or continuously chirped pulse amplified fiber laser system, wherein a high repetition frequency seed source, a pulse stretcher, a chirped pulse amplifier, a high power collimator and a high power pulse compressor are connected in sequence. The high repetition frequency seed source and the pulse stretcher are combined into the foremost end of the laser system and positioned in front of the chirped pulse amplifier, so that quasi-continuous or continuous stable laser output can be realized.
The high repetition frequency seed source is a high repetition frequency seed source, the repetition frequency is from hundreds MHz to GHz or above, the pulse stretcher is a large stretching amount pulse stretcher, the stretching amount is from hundreds of picoseconds to tens of nanoseconds, and the high repetition frequency seed source and the pulse stretcher convert pulse laser into quasi-continuous or continuous laser.
The high repetition frequency seed source is an optical fiber mode-locked laser.
The pulse stretcher is an optical fiber stretcher or a solid stretcher. The chirped pulse amplifier is an optical fiber amplifier. The pulse compressor is a solid compressor.
The chirped pulse amplifier is a multistage amplifier formed by taking rare earth-doped fibers with different core diameters as core devices, and has various pumping modes such as forward pumping, backward pumping or bidirectional pumping.
The high-power collimator is composed of one or more lenses, and the high-power pulse compressor is a solid compressor or a grating compressor.
The chirped pulse amplifier is of a multi-stage amplification structure and has multiple pumping modes.
The high repetition frequency seed source, the pulse stretcher and the chirped pulse amplifier are connected together in a welding or space coupling mode.
Compared with the prior art, the invention can achieve the following effects:
the invention relates to a quasi-continuous or continuous chirp pulse amplification fiber laser system, which comprises a high repetition frequency seed source, a pulse width stretcher, a chirp pulse amplifier, a high-power collimator and a high-power pulse width compressor, wherein the high repetition frequency seed source provides pulse repetition frequency of hundreds MHz to GHz or above, and the pulse width stretcher can stretch the pulse width to hundreds of picoseconds to tens of nanoseconds, thereby forming quasi-continuous or continuous laser. Compared with the traditional chirped pulse train, the quasi-continuous or continuous laser is amplified almost in a continuous light amplification mode in subsequent amplification, so that the quasi-continuous or continuous laser has more advantages in pumping efficiency and laser output power, and can finally obtain laser pulse output with higher power, higher energy and higher repetition frequency.
According to the quasi-continuous or continuous chirp pulse amplification optical fiber laser system, the high repetition frequency seed source, the pulse width stretcher and the chirp pulse amplifier are connected in a fusion welding or space coupling mode, so that the stability of the laser system and the quality of laser beams are greatly improved.
Drawings
FIG. 1 is a schematic diagram of a quasi-continuous or continuous chirped pulse amplified fiber laser system, in which (1) is a high repetition frequency seed source, (2) is a pulse stretcher, (3) is a chirped pulse amplifier, (4) is a high power collimator, and (5) is a high power pulse compressor.
FIG. 2 is a schematic diagram of the output pulse of a high repetition frequency seed source
FIG. 3 is a diagram of quasi-continuous or continuous laser pulses at the output of a pulse stretcher
FIG. 4 is a schematic diagram of a large energy quasi-continuous or continuous laser pulse at the output of a chirped pulse amplifier
FIG. 5 is a schematic diagram of a high energy ultrafast laser pulse at the output of a pulse compressor
Detailed Description
In order to make the objects and technical means of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a quasi-continuous or continuous chirped pulse amplification fiber laser system according to the present invention, as shown in fig. 1, the quasi-continuous or continuous chirped pulse amplification fiber laser system is composed of a high repetition frequency seed source 1, a pulse stretcher 2, a chirped pulse amplifier 3, a high power collimator 4, and a high power pulse width compressor 5, where the high repetition frequency seed source 1 is an all-fiber mode-locked laser for generating optical pulses with repetition frequencies of hundreds MHz to GHz, spectral bandwidths (several nanometers to tens of nanometers), and short pulse widths (femtoseconds or picoseconds), as shown in fig. 2, and finally outputting through an optical fiber or space.
The pulse stretcher 2 is connected with the high repetition frequency seed source 1, the pulse stretcher 2 stretches the high repetition frequency pulse to hundreds of picoseconds to tens of nanoseconds on a time domain, and the pulse peak power at the moment is greatly reduced. Meanwhile, due to the high repetition frequency and the wide time domain width of the laser pulse, two adjacent pulses can be subjected to pulse width superposition to a certain extent, so that quasi-continuous or continuous light is formed, as shown in fig. 3. The pulse stretcher 2 is a fiber stretcher or a solid stretcher.
The chirped pulse amplifier 3 is connected with the output end of the pulse stretcher 2, and performs multistage amplification on quasi-continuous or continuous light output by the pulse stretcher 2, the gain medium of each stage of chirped pulse amplifier 3 consists of rare earth-doped optical fibers with different core diameters, and the pumping mode of each stage of chirped pulse amplifier 3 is combination of multiple pumps, including forward pumping, backward pumping and bidirectional pumping. The multi-stage chirped pulse amplifier can make quasi-continuous or continuous light to achieve high average power, large energy, high repetition rate laser pulse output, as shown in fig. 4.
The high-power collimator 4 is connected to the output end of the chirped pulse amplifier 3 and is aligned with the continuous light or the continuous light to perform collimation output. The high power collimator 4 is composed of one or more lenses.
The high-power pulse compressor 5 is connected to the output end of the high-power collimator 4, and retracts the time-domain broadened, high-energy and high-power quasi-continuous or continuous optical pressure to the femtosecond level to the picosecond level, so as to finally obtain the ultrafast high-energy, high-power and high-repetition-frequency laser pulse output, as shown in fig. 5. The high power pulse compressor 5 is a solid compressor or a fiber compressor.
As a preferred example, the high repetition frequency seed source 1 outputs a pulse frequency of 1 GHz and a time domain pulse width of 100fs, after pulse time domain broadening is carried out by a pulse stretcher 2, the time domain pulse width is 1ns, the output pulse laser is changed into quasi-continuous or continuous laser, after multi-stage amplification is carried out by a chirped pulse amplifier 3, the quasi-continuous or continuous pulse laser reaches a high average power output of 1kW or even 10kW, after beam collimation is carried out by a high-power collimator 4, the laser is injected into a high-power pulse compressor 5, time domain compression is carried out on the output laser, so that the pulse can be compressed from 1ns to 100fs, and the laser at the moment obtains the output of the pulse laser with large energy, high repetition frequency and high average power.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. The fiber laser system for amplifying the quasi-continuous or continuous chirped pulses is characterized by comprising a high repetition frequency seed source (1), a pulse stretcher (2), a chirped pulse amplifier (3), a high-power collimator (4) and a high-power pulse compressor (5) which are sequentially connected, wherein the high repetition frequency seed source (1) is a high repetition frequency seed source, the repetition frequency is from hundreds MHz to GHz and above, the pulse stretcher (2) is a large stretching amount pulse stretcher, the stretching amount is from hundreds picoseconds to tens nanoseconds, and the high repetition frequency seed source (1) and the pulse stretcher (2) convert pulse lasers into the quasi-continuous or continuous lasers.
2. A quasi-continuous or continuously chirped pulse amplified fiber laser system according to claim 1, characterized in that said high repetition frequency seed source (1) is a fiber mode-locked laser.
3. A quasi-continuous or continuously chirped pulse amplification fiber laser system according to claim 1, characterized in that said pulse stretcher (2) is a fiber stretcher or a solid stretcher.
4. A quasi-continuous or continuously chirped pulse amplified fiber laser system according to claim 1, characterized in that said chirped pulse amplifier (3) is a fiber amplifier.
5. The fiber laser system of claim 1 or 4, wherein the chirped pulse amplifier (3) is a multistage amplifier with core devices of rare-earth-doped fibers with different core diameters, and the chirped pulse amplifier (3) has multiple pumping modes such as forward pumping, backward pumping or bidirectional pumping.
6. A quasi-continuous or continuously chirped pulse amplification fiber laser system according to claim 1, characterized in that said high power collimator (4) is composed of one or more lenses and said high power pulse compressor (5) is a solid state compressor or a grating compressor.
CN201911247861.9A 2019-12-09 2019-12-09 Quasi-continuous or continuous chirp pulse amplified fiber laser system Pending CN111082292A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113437621A (en) * 2021-06-17 2021-09-24 中国科学院上海光学精密机械研究所 High-power laser time-space chirped pulse amplification system
CN113732486A (en) * 2021-09-18 2021-12-03 苏州大学 Laser irradiation strengthening method and system based on continuous-repetition frequency pulse laser

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1431740A (en) * 2003-02-14 2003-07-23 中国科学院上海光学精密机械研究所 Optical parameter chatter pulses amplification laser system
US20100220752A1 (en) * 2009-03-02 2010-09-02 Polaronyx, Inc. 810 nm Ultra-Short Pulsed Fiber Laser
CN101881919A (en) * 2010-06-02 2010-11-10 苏州大学 Optical fiber chirped pulse amplifier for ultra-short laser pulse output
US20150063380A1 (en) * 2013-08-31 2015-03-05 Jian Liu Method and Apparatus for Generating Ultrafast, High Energy, High Power Laser Pulses
CN109346911A (en) * 2018-12-22 2019-02-15 北京工业大学 A kind of tens of megahertzs of Gao Zhongying nanoseconds full optical fiber laser amplifier

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1431740A (en) * 2003-02-14 2003-07-23 中国科学院上海光学精密机械研究所 Optical parameter chatter pulses amplification laser system
US20100220752A1 (en) * 2009-03-02 2010-09-02 Polaronyx, Inc. 810 nm Ultra-Short Pulsed Fiber Laser
CN101881919A (en) * 2010-06-02 2010-11-10 苏州大学 Optical fiber chirped pulse amplifier for ultra-short laser pulse output
US20150063380A1 (en) * 2013-08-31 2015-03-05 Jian Liu Method and Apparatus for Generating Ultrafast, High Energy, High Power Laser Pulses
CN109346911A (en) * 2018-12-22 2019-02-15 北京工业大学 A kind of tens of megahertzs of Gao Zhongying nanoseconds full optical fiber laser amplifier

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113437621A (en) * 2021-06-17 2021-09-24 中国科学院上海光学精密机械研究所 High-power laser time-space chirped pulse amplification system
CN113437621B (en) * 2021-06-17 2022-12-06 中国科学院上海光学精密机械研究所 High-power laser time-space chirped pulse amplification system
CN113732486A (en) * 2021-09-18 2021-12-03 苏州大学 Laser irradiation strengthening method and system based on continuous-repetition frequency pulse laser

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