CN101013249A - Narrow pulse fiber amplifier - Google Patents
Narrow pulse fiber amplifier Download PDFInfo
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- CN101013249A CN101013249A CNA2007100638277A CN200710063827A CN101013249A CN 101013249 A CN101013249 A CN 101013249A CN A2007100638277 A CNA2007100638277 A CN A2007100638277A CN 200710063827 A CN200710063827 A CN 200710063827A CN 101013249 A CN101013249 A CN 101013249A
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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
- H01S2301/00—Functional characteristics
- H01S2301/03—Suppression of nonlinear conversion, e.g. specific design to suppress for example stimulated brillouin scattering [SBS], mainly in optical fibres in combination with multimode pumping
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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
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Abstract
一种窄脉冲光纤放大器，属于激光技术领域。该光纤放大器含有种子源激光器、种子光耦合系统、增益光纤、泵浦源激光器和泵浦耦合系统，其特征在于在种子源激光器和增益光纤之间加入对种子源激光器发出的脉冲进行选择的脉冲选择器。选择出的脉冲序列具有可任意变化的重复频率、持续时间，经过光纤放大器的高增益放大，得到高功率、窄脉宽的激光脉冲输出。本发明的优点是，充分利用了种子源激光器脉宽窄和光纤放大器宽增益谱、高增益的优点，脉冲选择器的加入使得脉冲的重复频率和持续时间可以自由地改变。本发明可以得到较低重复频率的窄脉宽脉冲序列，其单脉冲能量、峰值功率能显著提高，同时还避免了受激布里渊散射效应。
A narrow pulse fiber amplifier belongs to the field of laser technology. The fiber amplifier contains a seed source laser, a seed optical coupling system, a gain fiber, a pump source laser and a pump coupling system, and is characterized in that a pulse for selecting the pulse emitted by the seed source laser is added between the seed source laser and the gain fiber Selector. The selected pulse sequence has an arbitrarily variable repetition frequency and duration, and is amplified by a high-gain fiber amplifier to obtain a high-power, narrow-width laser pulse output. The invention has the advantages of making full use of the narrow pulse width of the seed source laser and the advantages of wide gain spectrum and high gain of the fiber amplifier, and the addition of the pulse selector enables the repetition frequency and duration of the pulse to be changed freely. The invention can obtain a narrow pulse width pulse sequence with a lower repetition frequency, its single pulse energy and peak power can be significantly improved, and the stimulated Brillouin scattering effect can be avoided at the same time.
Description
Technical field
The present invention relates to a kind of fiber amplifier, particularly a kind of pulse fiber amplifier belongs to laser technology field.
Background technology
The pulse fiber amplifier has plurality of advantages such as high-level efficiency, high power, high-gain, thermal control management are simple, good beam quality, can produce the pulse of narrow pulsewidth, high-peak power, wide application prospect be arranged in fields such as industrial processes, material processed, military affairs, scientific researches.
The pulse fiber amplifier needs lower powered pulsed laser to be used to amplify as seed source, and seed source laser commonly used has mode-locked laser, Q-switched laser etc.Mode-locked laser can produce the pulse of very narrow pulsewidth, have a wide range of applications in fields such as industry, scientific researches, yet, because the principle of locked mode, it is long that the repetition frequency of its pulse is inversely proportional to the chamber of laser instrument, be not easy to do very longly because the chamber is long, so the repetition frequency of mode-locked laser is very high, generally in the 100MHz magnitude.The single pulse energy and the peak power of generally wishing pulse in the application are high as far as possible, and too high repetition frequency brings very big difficulty can for the raising of fiber amplifier single pulse energy and peak power.A lot of lower repetition frequencys of application need, as the 100kHz magnitude, this is difficult to realize for mode-locked laser.And the chamber of Q-switched laser length, pulsewidth, power and repetition frequency are to be mutually related, and are difficult to keep identical pulsewidth under different capacity level, different repetition frequency, that is to say that pulse pulsewidth and repetition frequency can not freely change.
Summary of the invention
The objective of the invention is to solve the problem that above-mentioned pulse repetition rate is too high or repetition frequency can not freely change, a kind of narrow pulse fiber amplifier is provided, can accesses the laser pulse output of the high power that pulse repetition rate and duration can freely change, narrow pulsewidth.
Technical scheme of the present invention is as follows:
A kind of narrow pulse fiber amplifier, contain seed source laser, seed light coupled system, gain fibre, pumping source laser instrument and pumping coupling system, the seed light that seed source laser is sent enters gain fibre through the seed light coupled system, the pump light that the pumping source laser instrument sends also enters gain fibre through pumping coupling system, the laser output that seed light obtains amplifying after by gain fibre is characterized in that: add the pulse selector that pulse that seed source laser is sent is selected between seed source laser and gain fibre.
Pulse selector of the present invention adopts acousto-optic pulse selector or electro-optical pulse selector switch.
Technical characterictic of the present invention also is: be respectively equipped with pulse stretcher and pulse shortener in the both sides of described gain fibre.
This paper sends out another bright technical characterictic: be provided with the non-linear frequency converter on the light path of fiber amplifier output.
Seed source laser of the present invention adopts locked mode solid state laser, Q-switch solid laser, cavity dumping solid state laser, mode locked fiber laser, Q adjusting optical fiber laser, cavity dumping fiber laser or semiconductor laser; The pulsewidth of seed source laser be femtosecond to nanosecond order, pulse repetition rate is kHz to a GHz magnitude; Gain fibre is single covering, double clad, many coverings or photonic crystals optical fiber structure; The pumping source laser instrument adopts the semiconductor laser of collimation output or the semiconductor laser of optical fiber coupling output; Pumping coupling system adopts optical lens, fiber coupler or branching shape fiber coupler.
The present invention compared with prior art has the following advantages and the high-lighting effect: the present invention can obtain the burst pulse sequence than low-repetition-frequency, and Shu Chu single pulse energy, peak power all can significantly improve with this understanding.Pulse repetition rate, duration of pulse all can freely change, and have increased the adaptability to using greatly.Simultaneously, the present invention has also avoided the stimulated Brillouin scattering effect in the long pulse broad pulse fiber amplifier well, can reach higher peak power level.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of narrow pulse fiber amplifier provided by the invention.
Fig. 2 is the synoptic diagram of pulse amplification process provided by the invention.
Fig. 3 is the structural representation of second kind of embodiment of narrow pulse fiber amplifier provided by the invention.
Fig. 4 is the structural representation of the third embodiment of narrow pulse fiber amplifier provided by the invention.
Fig. 5 is the structural representation of the 4th kind of embodiment of narrow pulse fiber amplifier provided by the invention.
Fig. 6 is the structural representation of the 5th kind of embodiment of narrow pulse fiber amplifier provided by the invention.
Among the figure: the 1-seed source laser; The 2-pulse selector; The 3-absorption cell; 4-seed light coupled system; The 5-gain fibre; 6-pump light coupled lens; The 7-dichroic mirror; 8-pumping source laser instrument; The 9-seed pulse; The pulse train that 10-selects; 11-amplifies the pulse train of output; The 12-fiber coupler; The 13-output coupler; 14-branching shape fiber coupler; The 15-pulse stretcher; Pulse behind the 16-broadening; The 17-pulse shortener; Pulse after the 18-compression; 19-non-linear frequency converter; The laser output of other wavelength of 20-.
Embodiment
Below in conjunction with accompanying drawing, principle of work of the present invention, concrete structure and embodiment are further described.
Fig. 1, Fig. 2 show the basic functional principle of narrow pulse fiber amplifier provided by the present invention and a kind of structural representation of embodiment.This narrow pulse fiber amplifier, contain seed source laser 1, pulse selector 2, seed light coupled system 4, gain fibre 5, pumping source laser instrument 8 and pumping coupling system, seed source laser 1 produces the seed pulse 9 of high repetition frequency, narrow pulsewidth, pulse selector 2 with unwanted pulse at the light path upper deflecting, being absorbed box 3 absorbs, the pulse train of selecting 10 can have repetition frequency, the duration of any needs, is coupled into by seed light coupled system 4 in the fibre core of gain fibre 5.In the present embodiment, pumping coupling system adopts the end pumping mode, and promptly pumping source laser instrument 8 is by being coupled into the fibre core or the inner cladding of gain fibre 5 by pump light coupled lens 6 to the dichroic mirror 7 of pump light wavelength high permeability.The pulse train of propagating in gain fibre 5 of selecting 10 obtains the amplification of high-gain, forms the laser of high power, narrow pulsewidth, and dichroic mirror 7 reflections by to the signal light wavelength high reflectance form the pulse train 11 of amplifying output.
In this device, pulse selector 2 can adopt acousto-optic pulse selector, electro-optical pulse selector switch, can select the pulse train of any repetition frequency, duration.Seed source laser 1 can be to adopt the burst pulse solid state laser of various crystalline materials as locked mode solid state laser, Q-switch solid laser, cavity dumping solid state laser or the other types of gain media, also can adopt with the narrow pulse fiber laser instrument of optical fiber as mode locked fiber laser, Q adjusting optical fiber laser, cavity dumping fiber laser or the other types of gain media, can also adopt the narrow pulse laser of narrow-pulse semiconductor laser or other types, its pulsewidth be femtosecond to nanosecond order, pulse repetition rate is kHz to a GHz magnitude.Seed light coupled system 4 can adopt optical lens, optical lens group or fiber coupler.Gain fibre 5 can adopt the doping of various elements or element combinations, as mixes ytterbium, neodymium-doped, er-doped, erbium and ytterbium codoping etc.Gain fibre 5 can be single covering, double clad, many coverings or photonic crystals optical fiber structure.Pumping source laser instrument 8 can adopt the semiconductor laser of collimation output or the semiconductor laser of optical fiber coupling output.
Fig. 3 is the structural representation of second kind of embodiment of narrow pulse fiber amplifier provided by the invention.With the difference of first kind of embodiment be that pumping coupling system adopts the profile pump mode, promptly adopt fiber coupler 12 that the pump light of the pumping source laser instrument 8 of tail optical fiber output is coupled into gain fibre 5, the pulse train 11 of amplifying output is by output coupler 13 outputs.
Fig. 4 is the structural representation of the third embodiment of narrow pulse fiber amplifier provided by the invention.With the difference of first kind of embodiment be that pumping coupling system adopts branching shape pumped fiber mode, promptly adopt branching shape fiber coupler 14 that the pump light of the pumping source laser instrument 8 of a plurality of tail optical fiber outputs is coupled into gain fibre 5, the pulse train 11 of amplifying output is by output coupler 13 outputs.
Fig. 5 is the structural representation of the 4th kind of embodiment of narrow pulse fiber amplifier provided by the invention.Be to have adopted chirped pulse to amplify mode with the difference of aforementioned embodiments, promptly be respectively equipped with pulse stretcher 15 and pulse shortener 17 in the both sides of described gain fibre 5, the pulse train of selecting 10 is passed through pulse stretcher 15 with pulse strenching, pulse 16 behind the broadening is transmitted in gain fibre 5, and obtain the amplification of high-gain, then again by the pulsewidth of pulse shortener 17 compression output pulses, the pulse 18 after finally obtaining compressing is exported.The pumping coupling system that provides among this figure is the profile pump mode, can also adopt aforesaid end pumping mode or branching shape pumped fiber mode.
Fig. 6 is the structural representation of the 5th kind of embodiment of narrow pulse fiber amplifier provided by the invention.Be on the light path of fiber amplifier output, to be provided with non-linear frequency converter 19 with the difference of aforementioned embodiments, amplify the pulse train 11 of output and carry out the non-linear frequency conversion, obtain the laser output 20 of other wavelength by non-linear frequency converter 19.According to the difference of non-linear frequency converter 19, by modes such as frequency multiplication and frequency, optical parametric oscillations, can obtain covering ultraviolet, visible, infrared, in the laser output of wave band such as infrared.The pumping coupling system that provides among this figure is the end pumping mode, can also adopt aforesaid profile pump mode or branching shape pumped fiber mode.Present embodiment also can adopt aforesaid chirped pulse to amplify mode, add pulse stretcher 15 and pulse shortener 17, pulse 18 after the compression that will obtain through broadening, amplification, compression is carried out the non-linear frequency conversion by non-linear frequency converter 19, obtains the laser output 20 of other wavelength.
Specific embodiment:
System architecture as shown in Figure 1, wherein seed source laser 1 adopts the semiconductor pumped locked mode Nd:YVO of 1W average power output
4Solid state laser, wavelength are 1064nm, and the pulsewidth of seed pulse 9 is 100ps, and repetition frequency is 100MHz.Pulse selector 2 adopts acousto-optic modulator and supporting radio-frequency power supply, makes unwanted pulse at the light path upper deflecting, is absorbed box 3 and absorbs.Pulse selector 2 has the repetition frequency of 500kHz, and the duration of pulse selector 2 open modes is 100ns, comprises 10 mode locking pulses in this duration.The pulse train of selecting 10 is coupled in the fibre core of gain fibre 5 by seed light coupled system 4.Wherein gain fibre 5 adopts the Yb-doped double-cladding polarization maintaining optical fibre of 20 μ m core diameters, 400 μ m inner cladding diameters, and the pump absorption coefficient of 976nm is 3dB/m, the long 6m of optical fiber.The welding of optical fiber two ends has end cap to damage to avoid end face, and is treated to 8 ° of angles to reduce end face reflection.The pump light of the centre wavelength 976nm that the pumping source laser instrument 8 of the two-dimensional collimation output of peak power 40W sends is coupled into the inner cladding of gain fibre 5 by the dichroic mirror 7 to pump light wavelength high permeability by pump light coupled lens 6, and absorbs effectively.The pulse train of propagating in gain fibre 5 of selecting out 10 obtains the amplification of high-gain, forms the laser of high power, narrow pulsewidth, and dichroic mirror 7 reflections by to the signal light wavelength high reflectance form the pulse train 11 of amplifying output.Because seed source is linear polarization output, optical fiber is polarization maintaining optical fibre, and therefore the laser of output also is linear polarization.
When the pumping light power that is coupled into optical fiber was 30W, the average power of output was 20W, and the repetition frequency of pulse is 500kHz, and in each cycle, the mode locking pulse sequence continues 100ns, and to comprise 10 pulsewidths be 100ps, be spaced apart the mode locking pulse of 10ns.The pulse energy (the ripple bag of pulsewidth 100ns) of output is 40 μ J, and peak power is 40KW.
If do not have pulse selector 2 in the system, under identical condition, the average power of output is 20W, and the repetition frequency of pulse is 100MHz, and pulsewidth is 100ps, and the pulse energy of output only is 0.2 μ J, and peak power only is 2KW.
The contrast The above results, obviously, the narrow pulse fiber amplifier that has pulse selector 2 that this patent proposes can obtain higher pulse energy and peak power.
The foregoing description has obtained the laser pulse of linear polarization output, high-peak power, narrow pulsewidth, and such output is fit to carry out the non-linear frequency conversion very much.Can utilize scheme shown in Figure 6, carry out high efficiency non-linear frequency conversion.For example, the pulse train 11 of above-mentioned amplification output is carried out frequency multiplication by the non-linear frequency converter 19 that the lbo crystal by noncritical phase matching constitutes, and can obtain wavelength is the green glow output of 532nm.Lbo crystal is of a size of 5 * 5 * 25mm, be controlled at 149 ℃ by temperature controlling stove, focusing system reasonable in design, make the focus diameter of incident laser be about 200 μ m, regulate incident angle and incident polarization direction, the conversion efficiency that can make frequency multiplication obtains the green glow output of average power greater than the wavelength 532nm of 10W greater than 50%.
Utilize the non-linear frequency converter 19 of other types, can obtain covering ultraviolet, visible, infrared, in the laser output of wave band such as infrared.
Claims (9)
1. narrow pulse fiber amplifier, contain seed source laser (1), seed light coupled system (4), gain fibre (5), pumping source laser instrument (8) and pumping coupling system, the seed light that seed source laser is sent enters gain fibre through the seed light coupled system, the pump light that the pumping source laser instrument sends also enters gain fibre through pumping coupling system, the laser output that seed light obtains amplifying after by gain fibre is characterized in that: the pulse selector (2) that the pulse that adding is sent seed source laser (1) between seed source laser (1) and gain fibre (5) is selected.
2. according to the described narrow pulse fiber amplifier of claim 1, it is characterized in that: described pulse selector (2) adopts acousto-optic pulse selector or electro-optical pulse selector switch.
3. according to the described narrow pulse fiber amplifier of claim 1, it is characterized in that: be respectively equipped with pulse stretcher (15) and pulse shortener (17) in the both sides of described gain fibre (5).
4. according to claim 1,2 or 3 described narrow pulse fiber amplifiers, it is characterized in that: on the light path of fiber amplifier output, be provided with non-linear frequency converter (19).
5. according to the described narrow pulse fiber amplifier of claim 1, it is characterized in that: described seed source laser (1) adopts locked mode solid state laser, Q-switch solid laser, cavity dumping solid state laser, mode locked fiber laser, Q adjusting optical fiber laser, cavity dumping fiber laser or semiconductor laser.
6. according to the described narrow pulse fiber amplifier of claim 1, it is characterized in that: the pulsewidth of described seed source laser (1) be femtosecond to nanosecond order, pulse repetition rate is kHz to a GHz magnitude.
7. according to the described narrow pulse fiber amplifier of claim 1, it is characterized in that: described gain fibre (5) is single covering, double clad, many coverings or photonic crystals optical fiber structure.
8. according to the described narrow pulse fiber amplifier of claim 1, it is characterized in that: described pumping source laser instrument (8) adopts the semiconductor laser of collimation output or the semiconductor laser of optical fiber coupling output.
9. according to the described narrow pulse fiber amplifier of claim 1, it is characterized in that: described pumping coupling system adopts pump light coupled lens (6), fiber coupler (12) or tree power shape fiber coupler (14).
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Cited By (11)
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| CN101145852B (en) * | 2007-11-01 | 2010-05-19 | 上海交通大学 | High Power Fiber Brillouin Amplifier for All-optical Buffer |
| CN102801099A (en) * | 2012-09-05 | 2012-11-28 | 苏州德龙激光有限公司 | High-peak power picoseconds laser with flexibly adjustable quantity of output pulses |
| CN103399447A (en) * | 2013-08-13 | 2013-11-20 | 中国航空工业集团公司北京长城计量测试技术研究所 | Generation method and device for dual-spectrum femtosecond laser frequency comb |
| WO2015157980A1 (en) * | 2014-04-17 | 2015-10-22 | 华为技术有限公司 | Optical waveguide and printed circuit board |
| CN105149773A (en) * | 2015-10-19 | 2015-12-16 | 苏州图森激光有限公司 | Transparent glass machining method and device |
| CN106063056A (en) * | 2014-01-06 | 2016-10-26 | Ipg光子公司 | Ultra-high power single mode green fiber laser operating in continuous wave and quasi-continuous wave regimes |
| CN109891197A (en) * | 2016-11-01 | 2019-06-14 | 光纳株式会社 | Brillouin scattering measuring method and Brillouin scattering measurement device |
| CN109997075A (en) * | 2016-08-25 | 2019-07-09 | 相干凯撒斯劳滕有限公司 | Modularization W pulsed laser source |
| CN111289951A (en) * | 2020-03-06 | 2020-06-16 | 南京长峰航天电子科技有限公司 | Wide pulse equivalent simulation method and device based on least square |
| CN111740301A (en) * | 2020-07-28 | 2020-10-02 | 广东瀚盈激光科技有限公司 | A fiber laser pulse train generating module and fiber laser |
| CN112828445A (en) * | 2021-01-19 | 2021-05-25 | 名光智能科技(佛山)有限公司 | Laser Cutting Equipment and Laser Cutting Systems |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101145852B (en) * | 2007-11-01 | 2010-05-19 | 上海交通大学 | High Power Fiber Brillouin Amplifier for All-optical Buffer |
| CN102801099A (en) * | 2012-09-05 | 2012-11-28 | 苏州德龙激光有限公司 | High-peak power picoseconds laser with flexibly adjustable quantity of output pulses |
| CN103399447A (en) * | 2013-08-13 | 2013-11-20 | 中国航空工业集团公司北京长城计量测试技术研究所 | Generation method and device for dual-spectrum femtosecond laser frequency comb |
| CN106063056B (en) * | 2014-01-06 | 2020-11-20 | Ipg光子公司 | Ultra-high-power single-mode green fiber lasers operating in CW and quasi-CW systems |
| CN106063056A (en) * | 2014-01-06 | 2016-10-26 | Ipg光子公司 | Ultra-high power single mode green fiber laser operating in continuous wave and quasi-continuous wave regimes |
| WO2015157980A1 (en) * | 2014-04-17 | 2015-10-22 | 华为技术有限公司 | Optical waveguide and printed circuit board |
| CN105149773A (en) * | 2015-10-19 | 2015-12-16 | 苏州图森激光有限公司 | Transparent glass machining method and device |
| CN109997075A (en) * | 2016-08-25 | 2019-07-09 | 相干凯撒斯劳滕有限公司 | Modularization W pulsed laser source |
| CN109997075B (en) * | 2016-08-25 | 2023-03-14 | 相干凯撒斯劳滕有限公司 | Modular UV pulsed laser source |
| CN109891197A (en) * | 2016-11-01 | 2019-06-14 | 光纳株式会社 | Brillouin scattering measuring method and Brillouin scattering measurement device |
| CN111289951B (en) * | 2020-03-06 | 2022-03-25 | 南京长峰航天电子科技有限公司 | Wide pulse equivalent simulation method and device based on least square |
| CN111289951A (en) * | 2020-03-06 | 2020-06-16 | 南京长峰航天电子科技有限公司 | Wide pulse equivalent simulation method and device based on least square |
| CN111740301A (en) * | 2020-07-28 | 2020-10-02 | 广东瀚盈激光科技有限公司 | A fiber laser pulse train generating module and fiber laser |
| CN112828445A (en) * | 2021-01-19 | 2021-05-25 | 名光智能科技(佛山)有限公司 | Laser Cutting Equipment and Laser Cutting Systems |
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Inventor after: Gong Mali Inventor after: Yan Ping Inventor after: Lei Ming Inventor after: Ye Changgeng Inventor after: Li Chen Inventor after: Liu Qiang Inventor after: Huang Lei Inventor after: Zhang Haitao Inventor before: Gong Mali Inventor before: Yan Ping Inventor before: Ye Changgeng Inventor before: Li Chen Inventor before: Liu Qiang Inventor before: Huang Lei Inventor before: Zhang Haitao |
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Free format text: CORRECT: INVENTOR; FROM: GONG MALI YAN PING YE CHANGGENG LI CHEN LIU QIANG HUANG LEI ZHANG HAITAO TO: GONG MALI YAN PING LEI MING YE CHANGGENG LI CHEN LIU QIANG HUANG LEI ZHANG HAITAO |
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