影响偏振合成效率的主要误差分析
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摘要
针对多级合成结构,分析了几个主要误差对偏振合成效率的影响,具体计算了合成效率随直径偏差、功率失衡、偏振度的变化规律。数值模拟结果表明,当两束光直径与功率完全相同时具有最大的合成效率,随着两束光直径和功率的偏差增大合成效率都会降低,相对而言合成效率对功率失衡的容差更大,当功率失衡为10%时,合成效率下降0.06%。结果表明I型结构具备向多链路拓展的可行性。
For multistep combining structure,the influences of several main errors on polarization beam combining efficiency are analyzed. Using the numerical method the change rules of the combining efficiency with diameter deviation,power imbalance and polarization purity and are calculated. The results show that the highest combining efficiency can be achieved when the diameter and power of two unit beam are identical. Combination efficiency decreases with the increasing of diameter deviation and power imbalance of the two beams. Relatively combining efficiency has a larger tolerance for power imbalance,which decreased by 0.06% when power imbalance is 10%. I-cascade structure is powerful in extensibility.
For multistep combining structure,the influences of several main errors on polarization beam combining efficiency are analyzed. Using the numerical method the change rules of the combining efficiency with diameter deviation,power imbalance and polarization purity and are calculated. The results show that the highest combining efficiency can be achieved when the diameter and power of two unit beam are identical. Combination efficiency decreases with the increasing of diameter deviation and power imbalance of the two beams. Relatively combining efficiency has a larger tolerance for power imbalance,which decreased by 0.06% when power imbalance is 10%. I-cascade structure is powerful in extensibility.
引文
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[2]周军,唐晓军,陈三斌,等.系统偏差对激光相干合成效果的影响[J].激光与红外,2015,45(4):378-382.ZHOU Jun,TANG Xiao-jun,CHEN San-bin,et al.Influence of system deviation on laser coherent combination[J].Laser&Infrared,2015,45(4):378-382.
[3]李发丹,郭会娜,孙建国,等.双光束光纤激光器相干合成仿真及实验研究[J].激光技术,2014,38(4):509-514.LI Fa-dan,GUO Hui-nan,SUN Jian-guo,et al.Simulation and experimental study on coherent combination of dual beam fiber laser[J].Laser Technology,2014,38(4):509-514.
[4]李彪,刘雁,曾曙光,等.光纤激光阵列相干合束的研究[J].激光技术,2015,39(5):712-716.LI Biao,LIU Yan,ZENG Shu-guang,et al.Study on coherent beam combination of fiber laser array[J].Laser Technology,2015,39(5):712-716.
[5]Uberna R,Bratcher A,Tiemann B G.Power scaling of a fiber master oscillator power amplifier system using a coherent polarization beam combination[J].Applied Optics,2010,49(35):6762-6765.
[6]Uberna R,Bratcher A,Tiemann B G.Coherent polarization beam combination[J].IEEE Journal of Quantum Electron,2010,46(8):1191-1196.
[7]马鹏飞,王小林.2 kW级光纤激光相干偏振合成[J].强激光与粒子束,2016,4(28):4-5.MA Peng-fei,WANG Xiao-lin.Coherent polarization beam combining of fiber lasers to 2 kW power-level[J].High Power Laser and Particle Beams,2016,4(28):4-5.
[8]A Flores,I Dajani.Kilowatt-class,all-fiber amplifiers for beam combining[C].SPIE,Newsroom Lasers&Sources2016(DOI:10.1117/2.1201512.006238).
[9]LIU Z J,ZHOU P,MA T F,et al.4-channel EDFA of High power narrow line-width laser and linear polarization coherent polar combining realize 5 k W highlight laser output[J].Chinese Journal of Lasers,2017,44(4):266-267.
[10]蒋茂华,苏毅,卢飞,等.占空比对激光相干合成的影响[J].激光与红外,2012,42(10):1103-1106.JIANG Mao-hua,SU Yi,LU Fei,et al.Influence of duty ratio on laser beam coherent combining[J].Laser&Infrared,2012,42(10):1103-1106.
[11]蒋茂华,苏毅,等.激光相干合成光束质量评价[J].强激光与粒子束,2013,25(2):367-370.JIANG Mao-hua,SU Yi,et al.Beam quality evaluation of coherently combined laser beams[J].High Power Laser and Particle Beams,2013,25(2):367-370.
[12]蒋茂华,苏毅,卢飞,等.偏振态对激光相干合成的影响[J].强激光与粒子束,2013,25(3):611-614.JIANG Mao-hua,SU Yi,LU Fei,et al.Influence of polarization on laser beam coherent combining[J].High Power Laser and Particle Beams,2013,25(3):611-614.
[13]董红成,刘阳,易葵,等.偏振光束相干合成的理论分析[J].中国激光,2009,36(9):2346-2351.DONG Hong-cheng,LIU Yang,YI Kui,et al.Theory analysis of polarized coherent combination[J].Chinese Journal of Lasers,2009,36(9):2346-2351.
[14]史晓刚,窦汝海,荆帅,等.相干合成系统的抖动对远场的影响[J].激光技术,2009,33(5):493-496.SHI Xiao-gang,DOU Ru-hai,JING Shuai,et al.Influence of system jitter on far field of coherently combined beam[J].Laser Technology,2009,33(5):493-496.
[15]范馨燕.主动锁相光纤激光相干合成技术研究[D].哈尔滨:哈尔滨工业大学,2010:1-125.FAN Xin-yan.Beam quality evaluation of coherently combined laser beams[D].Harbin:Harbin Institute of Technology,2010:1-125.