パルスファイバレーザーの高出力化を目的とした全ファイバ型位相加算レーザーシステムの開発

カテゴリ: 論文誌(論文単位)

グループ名: 【C】電子・情報・システム部門

発行日: 2016/01/01

タイトル(英語): Development of an all Fiber Coherent Beam Combining System toward High Energy Pulse Fiber Lasers

著者名: 閑林　優太（近畿大学大学院 総合理工学研究科），吉田　実（近畿大学大学院 総合理工学研究科），井上　大樹（近畿大学大学院 総合理工学研究科）

著者名(英語): Yuta Kambayashi (Interdisciplinary Graduate Faculty of Science and Engineering, Kinki University), Minoru Yoshida (Interdisciplinary Graduate Faculty of Science and Engineering, Kinki University), Tatsuki Inoue (Interdisciplinary Graduate Faculty of Science and Engineering, Kinki University)

キーワード: 位相加算，ファイバレーザー，高出力パルス，光路長制御，偏波自動補償　　Coherent beam combining，Fiber laser，High energy pulse，Optical path-length control，Polarization auto-compensation

要約(英語): Our present work develops an all fiber coherent beam combining system to achieve a high energy pulse fiber laser beyond pulse energy limits due to nonlinear effects in rare-earth-doped fibers. Coherent beam combining is a power addition technology that obtains high energy density and high beam quality because it integrates multiple laser beams in a mono-light wave. However, the coherent beam combining using optical fibers is technically difficult because the optical phases and polarizations in optical fibers fluctuate due to disturbances. Therefore, we developed a novel all fiber coherent beam combining system that can precisely control optical path lengths and automatically compensate polarization changes.When the system combined four laser pulses, it achieved a beam-combining efficiency of 96.6% that was about four times as high as a pulse energy before combining. In addition, the system obtained 97.1% beam-combining efficiency of coherent beam combining using femtosecond pulses that have very low coherences by minimizing the optical path-length differences between combined two pulses. Moreover, the system successfully regulated the beam-combining-efficiency changes to less than 2.0 percentage points in full width by suppressing optical path-length fluctuations and tracking-control of the optical phases.

本誌: 電気学会論文誌C（電子・情報・システム部門誌） Vol.136 No.1 （2016） 特集：電子回路関連技術

本誌掲載ページ: 70-75 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejeiss/136/1/136_70/_article/-char/ja/