Time-dependent oscillations in a cw HF chemical laser unstable resonator. Master's thesis
Technical Report
·
OSTI ID:6317937
The multi-line performance of a cw HF chemical laser was measured as a function of the SF/sub 6/ and H/sub 2/ flow rates, pressure and resonator type. The Blase II and MNORO3 cw chemical laser computer codes gave reasonable agreement with the experimental data as the flow rates and pressure were varied. Total power and beam diameter increased as the pressure decreased. The data indicate the occurrence of a near-resonant energy transfer from v=2, J=3, 4 to v=2, J=14 with a subsequent rotational cascade to v=2, J=11. The amplitude, frequency, and Fresnel number dependence of the time-dependent oscillations which were predicted to occur on lines whose saturated gain does not fill the unstable resonator were measured. The time-dependent oscillations had a period of abour 40 ns independent of flow rates, do not occur for Fresnel numbers less than 1.5, and their amplitudes increased as the fraction of the resonator filled by the saturated gain of the oscillating line decreased.
- Research Organization:
- Air Force Inst. of Tech., Wright-Patterson AFB, OH (USA)
- OSTI ID:
- 6317937
- Report Number(s):
- AD-A-142966/1
- Country of Publication:
- United States
- Language:
- English
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