4 January 2013 Two-beam coherent addition using the stochastic parallel gradient descent algorithm
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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.
© 2013 Society of Photo-Optical Instrumentation Engineers (SPIE)
Yuchuan Yang, Yuchuan Yang, Bitao Tan, Bitao Tan, Chen Lizi, Chen Lizi, Junwei Zhang, Junwei Zhang, Xiao Wang, Xiao Wang, } "Two-beam coherent addition using the stochastic parallel gradient descent algorithm," Optical Engineering 52(1), 014301 (4 January 2013). https://doi.org/10.1117/1.OE.52.1.014301 . Submission:

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