High Multiplexing of Coherent-Cavity Combining Fiber Laser by Cavity Length Control

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  • KAMBAYASHI Yuta
    Program in Electronics Engineering, Interdisciplinary Graduate School of Science and Engineering, Kinki University
  • SASAKI Toshiki
    Program in Electronics Engineering, Interdisciplinary Graduate School of Science and Engineering, Kinki University
  • YOSHIDA Minoru
    Program in Electronics Engineering, Interdisciplinary Graduate School of Science and Engineering, Kinki University

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Other Title
  • 共振器長制御によるコヒーレント共振器結合 ファイバレーザーの高多重化
  • Laser Original 共振器長制御によるコヒーレント共振器結合ファイバレーザーの高多重化
  • Laser Original キョウシンキチョウ セイギョ ニ ヨル コヒーレント キョウシンキ ケツゴウ ファイバレーザー ノ コウタジュウカ

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Abstract

Coherent-cavity combining (C3) is a power addition technique that can maintain high beam quality using coupled laser cavities. The number of laser modules that can coherently be combined in coupled cavities is limited by the mismatch of individual longitudinal modes. Our present work increases the number of coupled lasers by precise control of cavity lengths. In this paper, we report a novel C3 fiber laser with an optical-path-length control technique that uses an aluminum coated fiber (ACF) to which electric power is applied. The technique with an ACF completely consists of the longitudinal modes of two individual fiber lasers in the coupled cavity. The C3 system with ten laser modules achieved a combined efficiency of 90.2% when the technique with an ACF completely consisted of individual longitudinal modes of two out of ten laser modules.

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