cw operation at 1.051 μm of a waveguide laser consisting of a crystalline fiber of Nd0.5La0.5P5O14, 12×12 μm in cross section and 0.68 mm in length, is reported. When longitudinally pumped with a Kr ion laser at 752.5 nm the room-temperature laser threshold was less than 10-mW absorbed power.
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Weber et al. (1975) studied this question.
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