空间多点泵浦对光纤放大器SBS效应抑制的研究
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摘要
对主振荡功率放大(MOPA)结构的光纤激光器,采用空间多点泵浦方法,改变介质中增益的空间分布,能够在保证放大器效率的同时有效抑制光纤中的后向SBS散射光。对百瓦级光纤放大器中信号光、散射光及增益分布进行了数值模拟,分析了散射光放大原因,并将两点泵浦应用于该放大器系统,相同输出功率时,散射光由3.2 W降为6.8mW。计算结果表明,多点泵浦技术的引入,能有效抑制光纤放大器中的SBS效应。
The output power of a narrow line-width laser is usually limited by the Stimulated Brillouin Scattering(SBS)effect.In a master oscillator power amplifier(MOPA)structures,the multi-point pump could manipulate the spatial distribution of the gain inside the fiber through variations of the number and power of the pump source,leading to the suppression of the SBS effect with maintained amplification efficiency.A theoretical model concerning the100 W-level fiber amplifiers is proposed.Stimulation is performed to analyze the amplification process of the laser signal and SBS.The results demonstrate that the power of SBS decreases from 3.2 Wto 6.8 mW over the same output power,indicating the effectiveness of this new technology in SBS suppression.
The output power of a narrow line-width laser is usually limited by the Stimulated Brillouin Scattering(SBS)effect.In a master oscillator power amplifier(MOPA)structures,the multi-point pump could manipulate the spatial distribution of the gain inside the fiber through variations of the number and power of the pump source,leading to the suppression of the SBS effect with maintained amplification efficiency.A theoretical model concerning the100 W-level fiber amplifiers is proposed.Stimulation is performed to analyze the amplification process of the laser signal and SBS.The results demonstrate that the power of SBS decreases from 3.2 Wto 6.8 mW over the same output power,indicating the effectiveness of this new technology in SBS suppression.
引文
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[17]冷进勇,吴武明,陈胜平,等.单频拉曼光纤放大器中受激布里渊散射的抑制[J].中国激光,2010,37(9):2 334-2 339.(LENG Jin-yong,WU Wu-ming,CHEN Sheng-ping,et al.Suppression of stimulaed Brillouin scattering in single frequency Raman fiber amplifiers[J].Chinese Journal of Lasers,2010,37(9):2 334-2 339.)
[2]JEONG Y,NILSSON J,SAHU J,et al.Single-frequency,single-mode,plane-polarized ytterbium-doped fiber master oscillator power amplifier source with 264 W of output power[J].Opt Lett,2005,30(5):459-461.
[3]JEONG Y,NIILSSON J,SAHU J,et al.Power scaling of single-frequency ytterbium-doped fiber master-oscillator power-amplifier sources up to 500 W[J].IEEE J Sel Top Quantum Electron,2007,13(3):546-551.
[4]WALTON D,GRAY S,WANG J,et al.Kilowatt-level,narrow-linewidth capable fibers and lasers[C]//Proc SPIE,2007:645314.
[5]VERGIEN C,DAJANI I,ZERINGUE C.Theoretical analysis of single-frequency Raman fiber amplifier system operating at 1 178 nm[J].Opt Express,2010,18(25):26214-26 228.
[6]KOVALEV V I,HARRISON R G.Suppression of stimulated Brillouin scattering in high-power single-frequency fiber amplifers[J].Opt Lett,2006,31(2):161-163.
[7]DAWSON J W,MESSERLY M J,BEACH R J,et al.Analysis of the scalability of diffraction-limited fiber lasers and amplifiers to high average power[J].Opt Express,2008,16(17):13 240-13 266.
[8]DAJANI I,ZERINGUE C,LU C,et al.Stimulated Brillouin scattering suppression through laser gain competition:Scalability to high power[J].Opt Lett,2010:35(18):3114-3 116.
[9]HILDEBRANDT M,FREDE M,KWEE P,et al.Singlefrequency master-oscillator photonic crystal fiber amplifier with 148 W output power[J].Opt Express,2006,14(23):11 071-11 076.
[10]WIRTH C,SCHREIBER T,REKAS M,et al.High-power linear-polarized narrow linewidth photonic crystal fiber amplifier[C]//Pro SPIE,2010,7 580:75801H.
[11]GRAY S,LIU A,WALTON D T.502 Watt,single transverse mode,narrow linewidth,bidirectionally pumped Ybdoped fiber amplifier[J].Opt Express,2007,15(25):17044-17 050.
[12]周子超,王小林,粟荣涛,等.梯度掺杂增益光纤SBS效应抑制的理论研究[J].激光与光电子学进展,2016(7):070604.(ZHOU Zi-chao,WANG Xiao-lin,SU Rong-tao,et al.Theoretical study on SBS effect suppression of gradient doping gain fibers[J].Laser&Optoelectronics Progress,2016(7):070604.)
[13]HILDEBRANDT M,BSCHE S,WELELS P,et al.Brillouin scattering spectra in high-power single-frequency ytterbium doped fiber amplifiers[J].Opt Express,2008,16(20):15 970-1 597.
[14]杜文博,冷进勇,朱家健,等.增益竞争双波长放大单频光纤放大器理论研究[J].物理学报,2012,61(11):114203.(DU Wen-bo,LENG Jin-yong,ZHU Jia-jian,et al.Theoretical study of two-tone single frequency fiber amplifier with gain competition[J].Acta Phys Sin,2012,61(11):114203-1-114203-8.)
[15]胡旭东.高功率连续光纤激光器全局优化的研究[D].北京:北京交通大学,2015.(HU Xu-dong.Global optimization research on high power continue wave fiber lasers[D].Beijing:Beijing Jiaotong University,2015.)
[16]冷进勇.窄线宽光纤放大器的理论和实验研究[D].长沙:国防科学技术大学,2011.(LENG Jin-yong.Theoretical and experimental research on narrow-linewidth fiber amplifiers[D].Changsha:National University of Defense Technology,2011.)
[17]冷进勇,吴武明,陈胜平,等.单频拉曼光纤放大器中受激布里渊散射的抑制[J].中国激光,2010,37(9):2 334-2 339.(LENG Jin-yong,WU Wu-ming,CHEN Sheng-ping,et al.Suppression of stimulaed Brillouin scattering in single frequency Raman fiber amplifiers[J].Chinese Journal of Lasers,2010,37(9):2 334-2 339.)