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Application of optical phase lock loops in coherent beam combining

Liang, Wei and Satyan, Naresh and Aflatouni, Firooz and Yariv, Amnon and Kewitsch, Anthony and Rakuljic, George and Hashemi, Hossein (2008) Application of optical phase lock loops in coherent beam combining. In: Fiber Lasers V: Technology, Systems, and Applications. Proceedings of SPIE. No.6873. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 68731Y. ISBN 9780819470485.

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Coherent Beam Combining (CBC) technology holds the promise of enabling laser systems with very high power and near-ideal beam quality. In this work we propose and demonstrate a novel CBC servo system using optical phase lock loops for phase control. This servo system is based on entirely electronic components and, consequently, can be considerably more compact and less expensive compared to servo systems made of optical phase/frequency shifters. In the proof-of-concept experiments we have combined two 100mW 1064nm commercial semiconductor lasers with the filled-aperture approach at an efficiency of 94% and also two 50mW 1538nm commercial semiconductor lasers using the tiled-aperture approach with a strehl ratio of 0.9. In addition, we also present a theoretical consideration of the influence of various sources of noise on the combining efficiency of a cascaded filled-aperture CBC system.

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Additional Information:© 2008 Society of Photo-Optical Instrumentation Engineers (SPIE). The authors wish to acknowledge the support of DARPA’s MTO office (J. Mangano).
Funding AgencyGrant Number
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Subject Keywords:Coherent beam combining, optical phase lock loops
Series Name:Proceedings of SPIE
Issue or Number:6873
Record Number:CaltechAUTHORS:20180710-134602052
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Official Citation:Wei Liang, Naresh Satyan, Firooz Aflatouni, Amnon Yariv, Anthony Kewitsch, George Rakuljic, Hossein Hashemi, "Application of optical phase lock loops in coherent beam combining", Proc. SPIE 6873, Fiber Lasers V: Technology, Systems, and Applications, 68731Y (25 February 2008); doi: 10.1117/12.764378;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87712
Deposited By: George Porter
Deposited On:10 Jul 2018 20:53
Last Modified:15 Nov 2021 20:51

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