Coherently coupled high-power fiber arrays

Jesse Anderegg; Stephen Brosnan; Eric Cheung; Paul Epp; Dennis Hammons; Hiroshi Komine; Mark Weber; Michael Wickham

doi:10.1117/12.650138

23 February 2006 Coherently coupled high-power fiber arrays

Jesse Anderegg, Stephen Brosnan, Eric Cheung, Paul Epp, Dennis Hammons, Hiroshi Komine, Mark Weber, Michael Wickham

Proceedings Volume 6102, Fiber Lasers III: Technology, Systems, and Applications; 61020U (2006) https://doi.org/10.1117/12.650138
Event: Lasers and Applications in Science and Engineering, 2006, San Jose, California, United States

Abstract

A four-element fiber array has demonstrated 470 watts of coherently phased, linearly polarized light energy in a single far-field spot. Each element consists of a single-mode fiber-amplifier chain. Phase control of each element is achieved with a Lithium-Niobate phase modulator. A master laser provides a linearly polarized, narrow linewidth signal that is split into five channels. Four channels are individually amplified using polarization maintaining fiber power amplifiers. The fifth channel is used as a reference arm. It is frequency shifted and then combined interferometrically with a portion of each channel's signal. Detectors sense the heterodyne modulation signal, and an electronics circuit measures the relative phase for each channel. Compensating adjustments are then made to each channel's phase modulator. This effort represents the results of a multi-year effort to achieve high power from a single element fiber amplifier and to understand the important issues involved in coherently combining many individual elements to obtain sufficient optical power for directed energy weapons. Northrop Grumman Corporation and the High Energy Laser Joint Technology Office jointly sponsored this work.

Citation Download Citation

Jesse Anderegg, Stephen Brosnan, Eric Cheung, Paul Epp, Dennis Hammons, Hiroshi Komine, Mark Weber, and Michael Wickham "Coherently coupled high-power fiber arrays", Proc. SPIE 6102, Fiber Lasers III: Technology, Systems, and Applications, 61020U (23 February 2006); https://doi.org/10.1117/12.650138

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