Open AccessInfluence and simulated correction of tip/tilt phase error on fiber laser coherent beam combination
Author(s) -
Chao Geng,
Xinyang Li,
Xiaojun Zhang,
Congjun Rao
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.114202
Subject(s) - tilt (camera) , optics , collimator , amplitude , phase (matter) , beam (structure) , laser , piston (optics) , error detection and correction , adaptive optics , physics , fiber laser , computer science , wavefront , mathematics , algorithm , geometry , quantum mechanics
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.