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Proceedings Paper

Fiber laser coherent array for power scaling of single-mode fiber laser
Author(s): Akira Shirakawa; Keigo Matsuo; Ken-ichi Ueda
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Paper Abstract

Coherent beam combining of many fiber lasers by the Y-shaped complex resonator method realizes both power scaling and spectral narrowing. The basic characteristics of this Y-shaped coherent array, scalability of power summation, and bandwidth narrowing property are presented. As high as 85% addition efficiency with only a few longitudinal-modes was obtained in an array of eight 10-nm bandwidth lasers coupled by fused fiber couplers. By threshold control of the constructive-interference supermodes, high-speed (>1 kHz), high-contrast-ratio (>100) coherent control of beam direction has also been demonstrated. Mass-free and reaction-free properties can realize high-speed laser-beam scanning, which will be quite useful in many applications such as material processing and space communications.

Paper Details

Date Published: 8 October 2004
PDF: 6 pages
Proc. SPIE 5662, Fifth International Symposium on Laser Precision Microfabrication, (8 October 2004); doi: 10.1117/12.596366
Show Author Affiliations
Akira Shirakawa, Univ. of Electro-Communications (Japan)
Keigo Matsuo, Univ. of Electro-Communications (Japan)
Ken-ichi Ueda, Univ. of Electro-Communications (Japan)

Published in SPIE Proceedings Vol. 5662:
Fifth International Symposium on Laser Precision Microfabrication
Isamu Miyamoto; Henry Helvajian; Kazuyoshi Itoh; Kojiro F. Kobayashi; Andreas Ostendorf; Koji Sugioka, Editor(s)

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