CN102931574B - Single-frequency nanosecond pulse fiber raman amplifier - Google Patents
Single-frequency nanosecond pulse fiber raman amplifier Download PDFInfo
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- CN102931574B CN102931574B CN201210445904.6A CN201210445904A CN102931574B CN 102931574 B CN102931574 B CN 102931574B CN 201210445904 A CN201210445904 A CN 201210445904A CN 102931574 B CN102931574 B CN 102931574B
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Abstract
The invention relates to a single-frequency nanosecond pulse fiber raman amplifier. The amplifier is formed by orderly connecting a single-frequency nanosecond pulse laser seed source (1), an isolator (2), a laser delay device (3), a pumping laser (4), a signal/pumping laser beam combiner (5) and an energy transfer fiber (6) into a whole through a fusion splicer. According to the single-frequency nanosecond pulse fiber raman amplifier, nanosecond pulse laser is led as a seed source and a pumping source, so that limitation of stimulated Brillouin scattering (SBS) effect on output power is removed; and the single-frequency nanosecond pulse fiber raman amplifier has the advantages of narrow line width, narrow pulse width, high peak power, flexible gain wavelength, low amplified spontaneous radiation noise, simple structure, and the like, and has a great application prospect.
Description
Technical field
The present invention relates to is a kind of single-frequency nanosecond pulse fiber Raman amplifier, this amplifier be have narrow linewidth, narrow pulsewidth, high-peak power, gain wavelength flexibly, the full fiber amplifier of low, the advantages of simple structure and simple of amplified spont-aneous emission noise.
Technical background
The fields such as laser radar, laser guiding, atmospheric remote sensing, laser display, nonlinear frequency conversion and gravitational wave detection need the single-frequency laser light source of special wavelength.Directly utilize the laser amplifier output that gain media stimulated radiation obtains only to account for smaller portions in whole spectral region, the Laser output of some special wave band cannot be amplified by which.Fiber amplifier has good beam quality, conversion efficiency is high, heat management is convenient and the advantage such as compact conformation, becomes the study hotspot of laser field.In optical fiber, easily produce the nonlinear effects such as stimulated Brillouin scattering (SBS) effect and stimulated Raman scattering (SRS), the gain spectral wider (reaching 40THz) of SRS and gain wavelength be advantage flexibly, as long as raman amplifier has suitable pumping source just can obtain target wavelength output in very wide wave-length coverage, is the ideal solution that obtains special wavelength laser.Yet due in single-frequency jointed fiber laser, SBS threshold value is far below SRS threshold value, SBS has limited the peak power output of single-frequency raman amplifier, even can cause device failure.Generally need to be by suppress to the methods such as optical fiber stress application to SBS, but these method and technology difficulty are large, and laser amplifier system is too complicated.Due to the action time of SRS of action time---the about 10ns much smaller than SBS, the narrow linewidth pulse laser that is several nanoseconds for pulse duration, SBS threshold value will increase substantially, and SRS threshold value is unaffected, as long as select the laser of suitable parameters just can make the SBS threshold value even can be higher than SRS threshold value.Therefore,, adopt ps pulsed laser and ns pulsed laser as laser seed under certain condition, can eliminate the impact of SBS.
Summary of the invention
The present invention is intended to overcome continuous Raman amplifier the deficiencies in the prior art, a kind of single-frequency nanosecond pulse fiber Raman amplifier is provided, this amplifier should have narrow linewidth, narrow pulsewidth, high-peak power, gain wavelength flexibly, amplified spont-aneous emission noise feature low and simple in structure.
Technical solution of the present invention is as follows:
A single-frequency nanosecond pulse fiber Raman amplifier, its formation comprises single-frequency ps pulsed laser and ns pulsed laser seed source, isolator, laser deferred mount, pump laser, signal/pumping laser beam merging apparatus and energy-transmission optic fibre successively.
Described pure-tone pulse laser seed source pulsewidth <10 ns, live width <200 MHz, can be Q-switched laser, or intensity modulated laser outside chamber.
The energy-transmission optic fibre that described laser deferred mount can be certain length or optical fiber delay line apparatus.
Described pump laser is wide range pulse laser, spectrum width >0.1 nm, and pulse duration and repetition rate equate with seed source, peak power is greater than stimulated Raman scattering threshold value, the centre wavelength (λ of pumping laser
2) and seed source centre wavelength (λ
1) meet relational expression:
nm, frequency displacement corresponding to maximum that in formula, Δ v is Raman gain coefficienct, c is the light velocity in vacuum.
Described signal/pumping laser beam merging apparatus is wavelength division multiplexer or bundling device.
Described energy-transmission optic fibre is single cladded fiber or doubly clad optical fiber.
Work engineering of the present invention is:
The seed light that single-frequency ps pulsed laser and ns pulsed laser seed source sends is first passed through isolator, pass through again laser deferred mount, finally from the signal end of signal/pumping laser beam merging apparatus, enter energy-transmission optic fibre, the pump light that pump laser sends enters energy-transmission optic fibre from the pumping end of signal/pumping laser beam merging apparatus.By regulating laser deferred mount to make seed pulse and pumping pulse synchronous in time domain when entering energy-transmission optic fibre.Because the peak power of pumping laser has surpassed SRS threshold value, the particle in optical fiber will transit to virtual energy level, and seed laser is because its wavelength is in SRS gain spectral, will be amplified.
Technique effect of the present invention:
The present invention introduces ps pulsed laser and ns pulsed laser as seed source and pumping source, has eliminated the restriction of SBS to power output.Compare with continuous laser raman amplifier, it is simple in structure, be easy to realize, and has great practical value.
Accompanying drawing explanation
Fig. 1 is the structural representation of single-frequency nanosecond pulse fiber Raman amplifier of the present invention.
Embodiment
Fig. 1 is the structural representation of single-frequency nanosecond pulse fiber Raman amplifier of the present invention.As seen from the figure, the formation of single-frequency nanosecond pulse fiber Raman amplifier of the present invention comprises single-frequency ps pulsed laser and ns pulsed laser seed source 1, isolator 2, laser deferred mount 3, pump laser 4, signal/pumping laser beam merging apparatus 5 and energy-transmission optic fibre 6 successively, is connected into one successively by optical fiber splicer.
Work engineering of the present invention is:
The seed light that single-frequency ps pulsed laser and ns pulsed laser seed source sends is first passed through isolator, pass through again laser deferred mount, finally from the signal end of signal/pumping laser beam merging apparatus, enter energy-transmission optic fibre, the pump light that pump laser sends enters energy-transmission optic fibre from the pumping end of signal/pumping laser beam merging apparatus.By regulating laser deferred mount to make seed pulse and pumping pulse synchronous in time domain when entering energy-transmission optic fibre.Because the peak power of pumping laser has surpassed SRS threshold value, the particle in optical fiber will transit to virtual energy level, and seed laser is because its wavelength is in SRS gain spectral, will be amplified.
Lifting two specific embodiment is below described below:
Example 1, refers to Fig. 1, and single-frequency ps pulsed laser and ns pulsed laser seed source 1 centre wavelength is 1120 nm, and repetition rate is 1 MHz, and pulse duration is 5 ns, spectrum width <150 MHz.Pump laser 4 centre wavelengths are 1070 ± 10 nm, and repetition rate is 1 MHz, and pulse duration is 5 ns, spectrum width >0.1 nm, pulsed light peak power >90 W.Signal/pumping laser beam merging apparatus 5 is 1120 nm/1060-1080nm wavelength division multiplexers.Energy-transmission optic fibre 6 length are 100 m, and core diameter is 6.5 ± 1.0 μ m, the loss <0.3 dB/km of optical fiber.
Example 2, refers to Fig. 1, and single-frequency ps pulsed laser and ns pulsed laser seed source 1 centre wavelength is 1178 nm, and repetition rate is 500 kHz, and pulse duration is 5 ns, spectrum width <150 MHz.Pump laser 4 centre wavelengths are 1120 ± 10 nm, and repetition rate is 1 MHz, and pulse duration is 5 ns, spectrum width >0.1 nm, pulsed light peak power >30 W.Signal/pumping laser beam merging apparatus 5 is 1178 nm/1110-1130nm wavelength division multiplexers.Energy-transmission optic fibre 6 length are 300 m, and core diameter is 6.5 ± 1.0 μ m, the loss <0.3 dB/km. of optical fiber
Claims (1)
1. single-frequency nanosecond pulse fiber Raman amplifier, comprise single-frequency ps pulsed laser and ns pulsed laser seed source (1), isolator (2), laser deferred mount (3), pump laser (4), signal/pumping laser beam merging apparatus (5) and energy-transmission optic fibre (6), single-frequency ps pulsed laser and ns pulsed laser seed source (1), isolator (2), laser deferred mount (3), pump laser (4), signal/pumping laser beam merging apparatus (5) and energy-transmission optic fibre (6) are connected into one by optical fiber splicer successively, it is characterized in that:
Described pure-tone pulse laser seed source (1) pulsewidth <10 ns, live width <200 MHz, is Q-switched laser, or intensity modulated laser outside chamber;
Described pump laser (4) is wide range pulse laser, spectrum width >0.1 nm, and pulse duration and repetition rate equate with seed source, peak power is greater than stimulated Raman scattering threshold value, the central wavelength lambda of pumping laser
2with seed source central wavelength lambda
1meet relational expression:
nm, in formula
for frequency displacement corresponding to the maximum of Raman gain coefficienct,
cfor the light velocity in vacuum;
The seed light that single-frequency ps pulsed laser and ns pulsed laser seed source sends is first passed through isolator, pass through again laser deferred mount, finally from the signal end of signal/pumping laser beam merging apparatus, enter energy-transmission optic fibre, the pump light that pump laser sends enters energy-transmission optic fibre from the pumping end of signal/pumping laser beam merging apparatus, by regulating laser deferred mount to make seed pulse and pumping pulse synchronous in time domain when entering energy-transmission optic fibre, because the peak power of pumping laser has surpassed SRS threshold value, particle in optical fiber will transit to virtual energy level, and seed laser is because its wavelength is in SRS gain spectral, will be amplified, utilize the pulse laser of pulsewidth <10 ns as flashlight and pumping laser, eliminated the restriction of SBS to power output.
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| CN201210445904.6A CN102931574B (en) | 2012-11-09 | 2012-11-09 | Single-frequency nanosecond pulse fiber raman amplifier |
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| CN201210445904.6A CN102931574B (en) | 2012-11-09 | 2012-11-09 | Single-frequency nanosecond pulse fiber raman amplifier |
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| CN102931574B true CN102931574B (en) | 2014-08-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103269012B (en) * | 2013-05-31 | 2016-09-21 | 中国科学院上海光学精密机械研究所 | Single-frequency Raman optical fiber laser device system |
| CN103500912B (en) * | 2013-09-27 | 2015-08-12 | 江苏天元激光科技有限公司 | Based on the all-fiber Q adjusting optical fiber laser of stimulated Brillouin scattering |
| CN104104000B (en) * | 2014-07-10 | 2018-02-13 | 中国科学院上海光学精密机械研究所 | More covering Raman Fiber Amplifiers |
| CN108683063B (en) * | 2018-05-24 | 2021-02-09 | 中国工程物理研究院应用电子学研究所 | Diode direct pumping Raman fiber laser and spectrum synthesis method thereof |
| CN109742643A (en) * | 2019-02-28 | 2019-05-10 | 上海频准激光科技有限公司 | High power narrow linewidth Raman Fiber Amplifier |
| CN111541138B (en) * | 2020-04-17 | 2021-11-19 | 华南理工大学 | Device for inhibiting stimulated Brillouin scattering in high-power narrow-linewidth optical fiber laser |
| CN112003116A (en) * | 2020-08-24 | 2020-11-27 | 中国科学院上海光学精密机械研究所 | Ultrashort pulse Raman fiber amplifier |
Citations (2)
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| CN1365019A (en) * | 2001-08-10 | 2002-08-21 | 中国科学院长春光学精密机械与物理研究所 | Raman amplification method and amplifier of pulsed optical fibre for optical communication |
| CN101800396A (en) * | 2010-02-03 | 2010-08-11 | 中国人民解放军国防科学技术大学 | Stimulated Brillouin scattering (SBS) suppression method for narrow band fiber Raman amplifier |
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| US7307782B2 (en) * | 2001-07-31 | 2007-12-11 | Sumitomo Electric Industries, Ltd. | Raman amplifier and optical communication system including the same |
| JP3933550B2 (en) * | 2002-07-15 | 2007-06-20 | 古河電気工業株式会社 | Light source device for Raman amplification excitation having amplification band extension function, Raman amplifier using the same, amplification band extension setting method and program thereof |
| WO2009150743A1 (en) * | 2008-06-13 | 2009-12-17 | Ｎｅｃディスプレイソリューションズ株式会社 | Image display unit and method for displaying image |
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| CN1365019A (en) * | 2001-08-10 | 2002-08-21 | 中国科学院长春光学精密机械与物理研究所 | Raman amplification method and amplifier of pulsed optical fibre for optical communication |
| CN101800396A (en) * | 2010-02-03 | 2010-08-11 | 中国人民解放军国防科学技术大学 | Stimulated Brillouin scattering (SBS) suppression method for narrow band fiber Raman amplifier |
Non-Patent Citations (2)
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| 单频光纤拉曼放大器的实验研究;许将明等;《单频光纤拉曼放大器的实验研究》;20120731;第61卷(第7期);第074204-1到074204-1页 * |
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