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Near-field models of coherent beam combination (CBC) with different beam channels and fill factors are employed, and the influences of tip/tilt phase errors on CBC are studied. The key device for tilt-error correction, named adaptive fiber optics collimator(AFOC), is introduced. A MOPA-configuration fiber laser CBC system compensating both piston and tip/tilt phase errors is designed. Then, the dynamic courses of tilt-error correction using stochastic parallel gradient descent (SPGD) algorithm in a seven-channel system are simulated, and the effects of CBC at different tilt-error amplitudes and frequencies are investigated. Experimental results show that the tilt-error should be corrected to improve CBC effects, and algorithm's control ability drops off when tilt-error amplitude and frequency increase. The results in this paper present a reference for multi-channel high power fiber laser CBC systems in real atmospheric environments.
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Keywords:
- fiber laser /
- coherent beam combination /
- tip/tilt phase error /
- dynamic analysis
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[9] Vorontsov M 2005 Proc. SPIE 5895 589501
[10] Liu L, Vorontsov M, Polnau E, Weyrauch T, Beresnev L 2007 Proc. SPIE 6708 67080K
[11] Beresnev L, Vorontsov M 2005 Proc. SPIE 5895 58950R
[12] Geng C, Zhang X J, Li X Y, Rao C H Infrared and Laser Engineering (in Chinese) [耿 超、张小军、李新阳、饶长辉 红外与激光工程](in press)
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[1] Xiao R, Hou J, Jiang Z F 2008 Acta Phys. Sin. 57 853 (in Chinese) [肖 瑞、侯 静、姜宗福 2008 物理学报 57 853]
[2] Yang R F, Yang P, Shen F 2009 Acta Phys. Sin. 58 8297 (in Chinese) [杨若夫、杨 平、沈 锋 2009 物理学报 58 8297]
[3] Zhou P, Liu Z, Wang X, Ma Y, Ma H, Xu X 2009 Appl. Phy. Lett. 94 231106
[4] Wang X L, Zhou P, Ma Y X, Ma H T, Xu X J, Liu Z J, Zhao Y J 2010 Chin. Phys. B 19 094202
[5] Bruesselbach H, Jones D, Mangir M, Minden M, Rogers J 2005 Opt. Lett. 30 1339
[6] Wang J M, Duan K L, Wang Y S 2008 Acta Phys. Sin. 57 5627(in Chinese) [王建明、段开椋、王屹山 2008 物理学报 57 5627]
[7] Shay T, Benham V, Baker J 2006 Opt. Express 14 12022
[8] Zhou P, Ma Y X, Wang X L, Ma H T, Xu X J, Liu Z J 2009 Chin. J. Lasers 36 2972 (in Chinese) [周 朴、马阎星、王小林、马浩统、许晓军、刘泽金 2009 中国激光 36 2972]
[9] Vorontsov M 2005 Proc. SPIE 5895 589501
[10] Liu L, Vorontsov M, Polnau E, Weyrauch T, Beresnev L 2007 Proc. SPIE 6708 67080K
[11] Beresnev L, Vorontsov M 2005 Proc. SPIE 5895 58950R
[12] Geng C, Zhang X J, Li X Y, Rao C H Infrared and Laser Engineering (in Chinese) [耿 超、张小军、李新阳、饶长辉 红外与激光工程](in press)
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