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

N. Takei, S. Suzuki, F. Kannari

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    11 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Title of host publicationCLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    Pages744-745
    Number of pages2
    ISBN (Electronic)0780356616, 9780780356610
    DOIs
    Publication statusPublished - 1999 Jan 1
    Event1999 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim 1999 - Seoul, Korea, Republic of
    Duration: 1999 Aug 301999 Sep 3

    Publication series

    NameCLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics
    Volume3

    Conference

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

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Atomic and Molecular Physics, and Optics
    • Computer Networks and Communications
    • Physics and Astronomy(all)

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  • Cite this

    Takei, N., Suzuki, S., & Kannari, F. (1999). Compensation of thermal lensing in an eye-safe cascade Raman laser with Ba(NO3)2 crystal. In CLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics (pp. 744-745). [817811] (CLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics; Vol. 3). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/CLEOPR.1999.817811