Experimental Study of Resonance Radiation Trapping as a Method of Gain Improvement for Efficient Power Extraction from the XeF Blue-Green Laser Transition.
Final technical rept. 1 Jan 80-30 Sep 81,
CALIFORNIA UNIV SAN DIEGO LA JOLLA INST FOR PURE AND APPLIED PHYSICAL SCIENCES
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An experimental study has been carried out to explore the possibility of utilizing resonance radiation trapping as a method of gain improvement for efficient power extraction from the XeF C yield A blue-green laser transition. The experiment involved placing low-loss dichromatic mirrors to form a high-Q optical cavity around an x-ray preionized, homogeneous pulsed avalancheself-sustained discharge of approximate 1 liter volume and approximate 200 nsec duration. The double-peak spectral reflectivity of the dichromatic mirrors was so chosen that most of the uv resonance radiation from the XeF B yield X transition associated with the low-order TEM modes of the optical cavity could be trapped while the blue-green laser radiation built up within the same cavity from the C yield A inversion could be partially coupled out. No gain improvement has been observed, however, in such an experiment. Instead, gain measurements at several XeF C yield A transition wavelengths repeatedly showed large absorption losses during the early and late phases of the discharge, regardless of whether the uv resonance radiation trapping mirrors were used or not. Various factors which may have contributed to these negative results are examined and discussed. Author
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