An experimental investigation was made of the operational characteristics of a 2-μm ( λ =1923 nm) microlaser with a new efficient active medium in the form of a crystal of gadolinium vanadate Tm : GdVO 4 . Pumping with radiation from a Ti : sapphire laser generated output radiation of 180 mW power, which corresponded to an absolute efficiency of 36% and a differential efficiency of 55%. The differential efficiency of the Tm : GdVO 4 laser pumped with a laser diode was 10%.
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Михайлов et al. (1997) studied this question.
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