Intervalence band laser oscillation in p-Ge is achieved in a semiconfocal resonator system using external reflectors and the directivity of the output radiation is thereby largely improved. The spectrum of the radiation consists of several discrete lines due to simultaneous oscillations in multimodes. Preliminary attempts to select a single oscillation line by means of Fabri-Perot type interference are also described.
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Komiyama et al. (1987) studied this question.
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