Coherent beam combining of collimated fiber array based on target-in-the-loop technique

Xinyang Li; Chao Geng; Xiaojun Zhang; Changhui Rao

doi:10.1117/12.897153

12 October 2011 Coherent beam combining of collimated fiber array based on target-in-the-loop technique

Xinyang Li, Chao Geng, Xiaojun Zhang, Changhui Rao

Proceedings Volume 8178, Optics in Atmospheric Propagation and Adaptive Systems XIV; 81780M (2011) https://doi.org/10.1117/12.897153
Event: SPIE Remote Sensing, 2011, Prague, Czech Republic

Abstract

Coherent beam combining (CBC) of fiber array is a promising way to generate high power and high quality laser beams. Target-in-the-loop (TIL) technique might be an effective way to ensure atmosphere propagation compensation without wavefront sensors. In this paper, we present very recent research work about CBC of collimated fiber array using TIL technique at the Key Lab on Adaptive Optics (KLAO), CAS. A novel Adaptive Fiber Optics Collimator (AFOC) composed of phase-locking module and tip/tilt control module was developed. CBC experimental setup of three-element fiber array was established. Feedback control is realized using stochastic parallel gradient descent (SPGD) algorithm. The CBC based on TIL with piston and tip/tilt correction simultaneously is demonstrated. And the beam pointing to locate or sweep position of combined spot on target was achieved through TIL technique too. The goal of our work is achieve multi-element CBC for long-distance transmission in atmosphere.

Citation Download Citation

Xinyang Li, Chao Geng, Xiaojun Zhang, and Changhui Rao "Coherent beam combining of collimated fiber array based on target-in-the-loop technique", Proc. SPIE 8178, Optics in Atmospheric Propagation and Adaptive Systems XIV, 81780M (12 October 2011); https://doi.org/10.1117/12.897153

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