Compensation of thermal lensing in an eye-safe cascade Raman laser with Ba(NO3)2 crystal

N. Takei, S. Suzuki, F. Kannari

    研究成果: Conference contribution

    12 被引用数 (Scopus)

    抄録

    Recently, lasers operating in the eye-safe wavelength around 1.5 μm have found increasing demand in laser radar (LIDAR) applications. A high power laser output in the eye-safe wavelength region is obtainable with a Ba(NO3)2 Raman conversion crystal in a third Stokes line pumped by 1.06 μm Nd:YAG laser. During our previous experiments, we obtained 28 mJ, 27 mJ, and 8.5 mJ output energy for first, second, and third Stokes pulses, respectively, with a fixed pump energy of 140 mJ at 20 Hz repetition rate. These values are appropriate to LIDAR applications. Especially, the 20 Hz operation can significantly reduce data accumulation time in LIDAR systems compared with Ho:YAG lasers that are typically operated at around 5-10 Hz. However, we observed substantial decrease in the output energy during the first 50 sec of the continuous operation at 20 Hz. The energy drop is -7%, -46%, and -76% of the initial output for the first, second, and third Stokes, respectively. We supposed that the decrease of the output energy was caused by thermal loading associated with phonon relaxation in the Raman process. Hence, we experimentally studied the cause of the degradation in the output energy and tried to improve the performance.

    本文言語English
    ホスト出版物のタイトルCLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics
    出版社Institute of Electrical and Electronics Engineers Inc.
    ページ744-745
    ページ数2
    ISBN(電子版)0780356616, 9780780356610
    DOI
    出版ステータスPublished - 1999 1月 1
    イベント1999 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim 1999 - Seoul, Korea, Republic of
    継続期間: 1999 8月 301999 9月 3

    出版物シリーズ

    名前CLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics
    3

    Conference

    Conference1999 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim 1999
    国/地域Korea, Republic of
    CitySeoul
    Period99/8/3099/9/3

    ASJC Scopus subject areas

    • 電子材料、光学材料、および磁性材料
    • 原子分子物理学および光学
    • コンピュータ ネットワークおよび通信
    • 物理学および天文学(全般)

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