CN101201528A - All-fiber narrow-linewidth hundred-nanosecond pulse signal system - Google Patents
All-fiber narrow-linewidth hundred-nanosecond pulse signal system Download PDFInfo
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- CN101201528A CN101201528A CNA2007101721996A CN200710172199A CN101201528A CN 101201528 A CN101201528 A CN 101201528A CN A2007101721996 A CNA2007101721996 A CN A2007101721996A CN 200710172199 A CN200710172199 A CN 200710172199A CN 101201528 A CN101201528 A CN 101201528A
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- 239000000835 fiber Substances 0.000 title claims abstract description 58
- 239000013307 optical fiber Substances 0.000 claims abstract description 62
- 238000012544 monitoring process Methods 0.000 claims abstract description 9
- 239000004065 semiconductor Substances 0.000 claims abstract description 6
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 10
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 claims description 10
- 238000005253 cladding Methods 0.000 claims description 8
- 238000005086 pumping Methods 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 230000004927 fusion Effects 0.000 abstract description 3
- 230000008878 coupling Effects 0.000 description 9
- 238000010168 coupling process Methods 0.000 description 9
- 238000005859 coupling reaction Methods 0.000 description 9
- 230000003321 amplification Effects 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
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Abstract
A full-optical-fiber narrow-linewidth hundred-nanosecond pulse signal system comprises a distributed feedback optical fiber laser, an acousto-optic chopper, a ytterbium-doped single-mode optical fiber preamplifier and an optical fiber beam splitter which are sequentially connected, wherein 90% of the output end of the optical fiber beam splitter is in fusion joint with the signal end of a multimode pump beam combiner, the output tail fiber of the multimode pump beam combiner is in fusion joint with the optical fiber of the ytterbium-doped double-clad optical fiber amplifier, the pump end of the multimode beam combiner is connected with a multimode semiconductor laser, the output end face of the tail fiber of the ytterbium-doped double-clad optical fiber amplifier is provided with an 8-degree inclined plane, and the backward output monitoring end of the optical fiber beam splitter is connected with an optical fiber isolator. The amplified pulse signal has the advantages of narrow line width, basic transverse mode, single longitudinal mode, good stability and no distortion in high-power pulse shape, is easy to package and is less influenced by the environment.
Description
Technical field
The present invention relates to laser, particularly a kind of whole optical fiber narrow linewidth hundred billisecond pulse signal system, it is a kind of hundred ps pulsed laser and ns pulsed laser signal sources of utilizing yb-doped double-clad fiber to realize, its advantage is a good beam quality, narrow linewidth, fundamental transverse mode, single longitudinal mode, and realizing that the 200ns square wave is almost undistorted under the high-power situation, this system can be applicable to strict to live width, power and pulse shape simultaneously occasion.
Background technology
The signal source module that utilizes optical fiber to realize has good beam quality, the efficient height, and advantages such as high stability, compact conformation have been widely used in fields such as communication, industry and medical science.Mix ytterbium (Yb
3+) silica fibre belongs to simple two level structures, has wide absorption spectra, gain bandwidth (GB) and tuning range, quantum efficiency height, characteristics such as no excited state absorption, no concentration quenching; And because the special construction of doubly clad optical fiber, pump light can be propagated and realize the high power coupling of pump light and absorb in the covering of heavy in section, large-numerical aperture, improve the stored energy in the amplifier, realizes effective amplification of flashlight.These advantages make yb-doped double-clad fiber more and more cause people's extensive concern.
Although the big mode field area fibers (LMF) that extensively utilizes can effectively reduce the power density in the fiber core at present, improve non-linear threshold, realize long pulse signal high power, undistorted amplification, but because core diameter more than 10 μ m, can not guarantee the fundamental transverse mode transport property of light beam in the amplification process; Though and the common single mode optical fibres amplifier can guarantee single transverse mode characteristic of light beam, but because storable finite energy in the optical fiber, when hundred nanosecond pulses are amplified, along with the increase of signal power is easy to make amplifier gain saturated, cause the pulse shape distortion, the line width of can not satisfying the demand, high power, fundamental transverse mode, the distortionless situation of single longitudinal mode and pulse shape, for example, install the front-end driven system in the process of integrated direction development at inertial confinement fusion (ICF), before entering the beam splitter array, not only require the power height, pulse shape is undistorted, and requires good beam quality, the fundamental transverse mode single longitudinal mode.Simultaneously a lot of high-power amplifiers adopt the structure of Lens Coupling flashlights and pump light, and coupling is regulated difficult, and coupling efficiency is low, and structural instability is affected by environment bigger, these drawbacks limit its application in many instances.
Summary of the invention
The technical problem to be solved in the present invention is to overcome above-mentioned the deficiencies in the prior art, a kind of whole optical fiber narrow linewidth hundred billisecond pulse signal system is provided, and this system should realize the laser pulse amplifying signal output of narrow linewidth, high power, fundamental transverse mode, single longitudinal mode and good stability.
Technical solution of the present invention is as follows:
A kind of whole optical fiber narrow linewidth hundred billisecond pulse signal system, constitute and comprise the distributed feedback optical fiber laser that connects successively, the acousto-optic chopper, mix ytterbium single-mode fiber prime amplifier, fiber optic splitter, in 90% output terminal of this fiber optic splitter and the signal end welding mutually of multimode pump combiner, the optical fiber welding mutually of the output tail optical fiber of this multimode pump combiner and ytterbium-doped double-clad fiber amplifier, the pumping termination multiple die semiconductor laser instrument of this multimode bundling device, the output end face of the tail optical fiber of described ytterbium-doped double-clad fiber amplifier has 8 ° inclined-plane, described fiber optic splitter back to output monitoring terminated optical fiber isolator.
The described ytterbium single-mode fiber prime amplifier of mixing has bandwidth 1nm optical fiber filter.
Described multimode pump combiner output tail optical fiber is the non-doped fiber of double clad, the inner cladding diameter is 125 μ m, numerical aperture 0.45, core diameter 4 μ m, numerical aperture 0.12, the inner cladding diameter of described ytterbium-doped double-clad fiber amplifier are 130 μ m, numerical aperture 0.46, fibre core mode field diameter 6.5 μ m, numerical aperture 0.12.
The output termination high-power fiber optic isolator of described ytterbium-doped double-clad fiber amplifier.
Experiment shows, amplification pulse signal of the present invention has narrow linewidth, fundamental transverse mode, single longitudinal mode, good stability and in the distortionless advantage of high power pulse shape, easily encapsulation and affected by environment less.
Description of drawings
Fig. 1 is the structural representation of the narrow linewidth hundred nanosecond pulse signal source system of the full optical fiber of the present invention.
Among the figure:
The 1-distributed feedback optical fiber laser; 2-acousto-optic chopper; 3-mixes ytterbium single-mode fiber prime amplifier, comprises a centre wavelength 1 μ m, the optical fiber filter of bandwidth 1nm; 10: 90 fiber optic splitters of 4-wavelength 1 μ m; The 5-12m yb-doped double-clad fiber; The 6-fibre optic isolater; 7-multimode pump combiner;
Embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing, but should not limit protection scope of the present invention with this.
See also Fig. 1 earlier, Fig. 1 is the structural representation of the narrow linewidth hundred nanosecond pulse signal source system of the full optical fiber of the present invention.It also is the structural representation of the embodiment of the invention 1, as seen from the figure, the formation of the narrow linewidth hundred nanosecond pulse signal source system of the full optical fiber of the present invention comprises the distributed feedback optical fiber laser 1 that connects successively, acousto-optic chopper 2, mix ytterbium single-mode fiber prime amplifier 3, fiber optic splitter 4, in 90% output terminal of this fiber optic splitter 4 and the signal end welding mutually of multimode pump combiner 7, the optical fiber welding mutually of the output tail optical fiber of this multimode pump combiner 7 and ytterbium-doped double-clad fiber amplifier 5, the pumping termination multiple die semiconductor laser instrument LD2 of this multimode bundling device 7, the output end face of the tail optical fiber of described ytterbium-doped double-clad fiber amplifier 5 has 8 ° of inclined-planes, described fiber optic splitter 4 back to output monitoring terminated optical fiber isolator 6.
In the present embodiment, described distributed feedback optical fiber laser 1 is to adopt output linewidth very narrow (distributed feedback optical fiber laser of＜100KHz) centre wavelength 1 μ m is made the signal seed light, through obtaining pulse signal behind the acousto-optic chopper 2, for the pulsewidth of repetition frequency 1Hz is the 200ns square-wave pulse; The described ytterbium single-mode fiber prime amplifier 3 of mixing has bandwidth 1nm optical fiber filter, semiconductor laser LD1 is as pumping source, and this is mixed ytterbium single-mode fiber prime amplifier 3 and amplifies weak pulse towards signal, and output terminal adopts bandwidth 1nm optical fiber filter, the filtering spontaneous emission noise improves signal to noise ratio (S/N ratio).
Pumping source as ytterbium-doped double-clad fiber amplifier 5 is wavelength 970nm, the multiple die semiconductor laser instrument LD2 of peak power output 2W.Multimode pump combiner 7 can realize the high coupling efficiency of pumping and flashlight, and the pump light coupling efficiency is 95%, and the flashlight coupling efficiency is 86%; Described ytterbium-doped double-clad fiber amplifier 5 is to mix Yb optical fiber by the 12m double clad to constitute, and can realize power amplification to the pulsed light of centre wavelength 1 μ m pulsewidth 200ns.Multimode pump combiner 7 output tail optical fibers are the non-doped fiber of double clad, and the inner cladding diameter is 125 μ m, numerical aperture 0.45, core diameter 4 μ m, numerical aperture 0.12.The inner cladding diameter of the doubly clad optical fiber of described ytterbium-doped double-clad fiber amplifier 5 is 130 μ m, numerical aperture 0.46, fibre core mode field diameter 6.5 μ m, numerical aperture 0.12.Optical fiber parameter mates substantially, Yb-doped double-cladding optical fiber can with the direct welding of output tail optical fiber of multimode pump combiner 7, its splice loss, splice attenuation is less than 1dB; Adopt 8 ° of inclined-plane outputs, prevent that amplified spont-aneous emission light (ASE) from forming self-sustained oscillation in amplifier, break system device.Described fiber optic splitter 4 has adopted 90: 10 beam splitters of wavelength 1 μ m, this beam splitter 4 has two forward output terminals and an inverse output terminal, thereby can realize input signal monitoring and oppositely output power and pulse waveform monitoring simultaneously, the splitting ratio of two forward output terminals is 90: 10.Because backward supervision output terminal fiber end face and forward direction amplifying signal output optical fibre end face form cavity oscillation easily, so at reverse output monitoring terminated optical fiber isolator 6, effectively avoided the light generation phenomenon of output pulse, can further improve pulse power, and the square-wave pulse shape has been undistorted.Simultaneously, because the fiber core mode field diameter that adopts has effectively guaranteed the fine beam quality of output pulsed base transverse mode single longitudinal mode all about 6 μ m in the system.
On operation steps, seed source distributed feedback optical fiber laser 1 output continuous signal optical linewidth＜100KHz, power 8mW, obtain repetition frequency 1Hz through acousto-optic chopper 2, the pulse signal of pulse 200ns, amplify and the filtering of 1nm bandwidth through mixing ytterbium single-mode fiber prime amplifier 3 again, enter in the double-cladding fiber amplifier 5 by beam splitter 4 and multimode pump combiner 7, open pumping source, centre wavelength 970nm progressively increases pump power, input signal monitoring client monitoring input pulse waveform, the backward supervision end is observed reverse output pulse waveform, the generation of non-linear phenomena SBS in the detecting amplifier in real time, and 8 degree inclined-plane output terminals are observed output pulse waveform through the optical fiber coupling, amplify through the 12m doubly clad optical fiber, obtain peak power 3W, stable 2.1%rms, the distortionless 200ns square wave output of pulse.
In the present embodiment, pulse signal is output as 8 degree inclined-plane outputs, observes pulse stability and need adopt the spatial light Lens Coupling to advance optical fiber, and the instability of coupled system makes the instability of total output pulse bigger than normal, and present embodiment is desirable not enough, has limited its application scenario.
Claims (4)
1. whole optical fiber narrow linewidth hundred billisecond pulse signal system, be characterised in that its formation comprises the distributed feedback optical fiber laser (1) that connects successively, acousto-optic chopper (2), mix ytterbium single-mode fiber prime amplifier (3), fiber optic splitter (4), in 90% output terminal of this fiber optic splitter (4) and the signal end welding mutually of multimode pump combiner (7), the optical fiber welding mutually of the output tail optical fiber of this multimode pump combiner (7) and ytterbium-doped double-clad fiber amplifier (5), the pumping termination multiple die semiconductor laser instrument of this multimode bundling device (7), the output end face of the tail optical fiber of described ytterbium-doped double-clad fiber amplifier (5) has 8 degree inclined-planes, described fiber optic splitter (4) back to output monitoring terminated optical fiber isolator (6).
2. whole optical fiber narrow linewidth hundred billisecond pulse signal system according to claim 1 is characterized in that the described ytterbium single-mode fiber prime amplifier (3) of mixing has bandwidth 1nm optical fiber filter.
3. whole optical fiber narrow linewidth hundred billisecond pulse signal system according to claim 1, it is characterized in that described multimode pump combiner (7) output tail optical fiber is the non-doped fiber of double clad, the inner cladding diameter is 125 μ m, numerical aperture 0.45, core diameter 4 μ m, numerical aperture 0.12, the optical fiber inner cladding diameter of described ytterbium-doped double-clad fiber amplifier (5) is 130 μ m, numerical aperture 0.46, fibre core mode field diameter 6.5 μ m, numerical aperture 0.12.
4. whole optical fiber narrow linewidth hundred billisecond pulse signal system according to claim 1 is characterized in that the output termination high-power fiber optic isolator of described ytterbium-doped double-clad fiber amplifier (5).
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| CNB2007101721996A CN100492148C (en) | 2007-12-13 | 2007-12-13 | All-fiber narrow-linewidth hundred-nanosecond pulse signal system |
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| CNB2007101721996A CN100492148C (en) | 2007-12-13 | 2007-12-13 | All-fiber narrow-linewidth hundred-nanosecond pulse signal system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101478111B (en) * | 2009-01-19 | 2010-06-02 | 华东师范大学 | Process for generating low repeat frequency ultra-short laser pulse |
| CN102005697A (en) * | 2010-10-15 | 2011-04-06 | 北京大学 | Line cavity laser with super-narrow line width based on parallel feedback |
| CN102449936A (en) * | 2009-05-11 | 2012-05-09 | Ofs菲特尔有限责任公司 | Systems and techniques for suppressing backward lasing in high-power cascaded raman fiber lasers |
| CN104466650A (en) * | 2014-12-24 | 2015-03-25 | 山西大学 | Nanosecond chirped pulse light source producing device and method |
| CN108267231A (en) * | 2018-03-19 | 2018-07-10 | 浙江师范大学 | High-capacity optical fiber laser power and SBS threshold on-Line Monitor Device |
| CN112701557A (en) * | 2019-10-22 | 2021-04-23 | 朗美通经营有限责任公司 | Optical amplifier |
| CN114039264A (en) * | 2021-11-30 | 2022-02-11 | 湖北久之洋信息科技有限公司 | Pre-charging quick-start fiber laser |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1402896A (en) * | 1999-09-29 | 2003-03-12 | 康宁O.T.I股份公司 | Method for producing fiber laser |
| US20020141695A1 (en) * | 2001-02-07 | 2002-10-03 | Redc Optical Networks Ltd. | Method and apparatus for a dynamic gain equalizer for an erbium doped fiber amplifier |
| CN2901642Y (en) * | 2005-11-29 | 2007-05-16 | 胡姝玲 | Short pulse ytterbinm doped double coating layer optical fiber laser |
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2007
- 2007-12-13 CN CNB2007101721996A patent/CN100492148C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101478111B (en) * | 2009-01-19 | 2010-06-02 | 华东师范大学 | Process for generating low repeat frequency ultra-short laser pulse |
| CN102449936A (en) * | 2009-05-11 | 2012-05-09 | Ofs菲特尔有限责任公司 | Systems and techniques for suppressing backward lasing in high-power cascaded raman fiber lasers |
| CN102005697A (en) * | 2010-10-15 | 2011-04-06 | 北京大学 | Line cavity laser with super-narrow line width based on parallel feedback |
| CN104466650A (en) * | 2014-12-24 | 2015-03-25 | 山西大学 | Nanosecond chirped pulse light source producing device and method |
| CN104466650B (en) * | 2014-12-24 | 2017-06-20 | 山西大学 | The generation device and method of nanosecond chirped pulse light source |
| CN108267231A (en) * | 2018-03-19 | 2018-07-10 | 浙江师范大学 | High-capacity optical fiber laser power and SBS threshold on-Line Monitor Device |
| CN112701557A (en) * | 2019-10-22 | 2021-04-23 | 朗美通经营有限责任公司 | Optical amplifier |
| CN114039264A (en) * | 2021-11-30 | 2022-02-11 | 湖北久之洋信息科技有限公司 | Pre-charging quick-start fiber laser |
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| CN100492148C (en) | 2009-05-27 |
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