Abstract
End-pumped by a continuous-wave 976 nm diode laser, efficient 1522 nm laser operation was demonstrated in an crystal when a sapphire crystal was used as a heat diffuser. A continuous-wave 1522 nm laser with a maximum output power of 750 mW and slope efficiency of 36% was realized at an absorbed pump power of 4.1 W. The pulse performances of an acousto-optic -switched laser with various repetition frequencies were investigated in detail. In a repetition frequency range of 1–10 kHz, 1522 nm pulse lasers with a slope efficiency of about 10%, peak output power at the kilowatt level, and width of about 50 ns were first obtained in an crystal pumped by a continuous-wave diode laser. The results indicate that the crystal is a promising gain medium for an actively -switched 1.5 μm laser.
© 2015 Optical Society of America
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