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Proceedings Paper

Coherently coupled high-power fiber arrays
Author(s): Jesse Anderegg; Stephen Brosnan; Eric Cheung; Paul Epp; Dennis Hammons; Hiroshi Komine; Mark Weber; Michael Wickham
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Paper 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.

Paper Details

Date Published: 23 February 2006
PDF: 5 pages
Proc. SPIE 6102, Fiber Lasers III: Technology, Systems, and Applications, 61020U (23 February 2006); doi: 10.1117/12.650138
Show Author Affiliations
Jesse Anderegg, Northrop Grumman Space Technology (United States)
Stephen Brosnan, Northrop Grumman Space Technology (United States)
Eric Cheung, Northrop Grumman Space Technology (United States)
Paul Epp, Northrop Grumman Space Technology (United States)
Dennis Hammons, Northrop Grumman Space Technology (United States)
Hiroshi Komine, Northrop Grumman Space Technology (United States)
Mark Weber, Northrop Grumman Space Technology (United States)
Michael Wickham, Northrop Grumman Space Technology (United States)


Published in SPIE Proceedings Vol. 6102:
Fiber Lasers III: Technology, Systems, and Applications
Andrew J. W. Brown; Johan Nilsson; Donald J. Harter; Andreas Tünnermann, Editor(s)

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