Theoretical study of a high-energy pulsed H2/F2 chain first vibrational overtone HF chemical laser

Shu Ichi Ashidate, Toshiaki Takashima, Fumihiko Kannari, Minoru Obara

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    4 Citations (Scopus)

    Abstract

    We have theoretically investigated the output performance of a pulsed discharge initiated H2/F2 chain first vibrational overtone HF chemical laser. The model used included rotational relaxation processes and simulated simultaneously both fundamental and overtone oscillations since the undesirable fundamental lasing cannot completely be suppressed during the experimental overtone oscillation. In the H2/F2 chain reaction system, which can produce the highly vibrationally excited HF(v) molecules up to vibrational level v=6, higher overtone output energy can be expected due to the increased vibrational overtone P branches, the increased transition probability of the first overtone transitions at the higher vibrational levels, and to the relative longer gain duration of a few tens microseconds. The overtone output energy of 2.73 J/l is obtainable from the laser gas mixture of F2/H2/He=10/4/786 (Torr). Adding He diluent gas can effectively suppress the undesirable fundamental lasing by pressure broadening; the overtone output energy is much less sensitive to this effect. The overtone output energy is found to be dependent on the residual reflectivity of the resonator mirrors over the fundamental lasing band.

    Original languageEnglish
    Pages (from-to)548-553
    Number of pages6
    JournalJournal of Applied Physics
    Volume70
    Issue number2
    DOIs
    Publication statusPublished - 1991 Dec 1

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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