We report on quaiscontinuous laser oscillation of lithium neodymium tetraphosphate of 2−mm length pumped transversely with a chopped argon laser. The room−temperature threshold was 95 mW and the slope efficiency was 3.7%. The threshold of transverse pumping was 2.5 times that of longitudinal pumping; therefore, the relative pumping efficiency was 40%.
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Otsuka et al. (1975) studied this question.
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