Efficient laser emission of Ho3+ at 2μ has been obtained from a single crystal of HoF3 at liquid-nitrogen temperatures. This is the first pure, undiluted rare-earth compound laser. Fluorescence and absorption spectra indicated a spontaneous linewidth of 1.5 cm−1 for the laser transition. The fluorescence lifetime at 77°K was 2.6 msec, or 29% of the radiative lifetime as measured in dilution in an isomorphic host. The laser threshold for a 15-mm rod was about 1 J.
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Devor et al. (1971) studied this question.
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