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Optical Engineering

Two-beam coherent addition using the stochastic parallel gradient descent algorithm
Author(s): Yuchuan Yang; Bitao Tan; Chen Lizi; Junwei Zhang; Xiao Wang
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Paper Abstract

The coherent addition of multiple beams is one of the great challenges in terms of large-scale lasers. Implementing the capability to generate ultra-high-focus power intensity on the focal plane places stringent requirements on the control of each beam’s pointing and intra-beam phasing. The random beam-to-beam phase jumps, mainly induced by the catoptric elements’ rapid vibration, should be eliminated to realize phase locking. A two-way laser beam’s coherent combination test bed is designed to test the capabilities of phase-locking system. The results show that the closed-loop feedback system achieved a high contrast of the in-phase intensity pattern at the receiving plane after correcting for piston and tip/tilt errors between two adjacent laser beams by the stochastic parallel gradient descent algorithm.

Paper Details

Date Published: 4 January 2013
PDF: 7 pages
Opt. Eng. 52(1) 014301 doi: 10.1117/1.OE.52.1.014301
Published in: Optical Engineering Volume 52, Issue 1
Show Author Affiliations
Yuchuan Yang, Northwest Institute of Nuclear Technology (China)
Bitao Tan, Northwest Institute of Nuclear Technology (China)
Chen Lizi, Northwest Institute of Nuclear Technology (China)
Junwei Zhang, China Academy of Engineering Physics (China)
Xiao Wang, China Academy of Engineering Physics (China)


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