Abstract

Laser operation in the 2 micrometers -wavelength range is reported. Two different crystals are studied: Y<SUB>2</SUB>SiO<SUB>5</SUB> and SrY<SUB>4</SUB>(SiO<SUB>4</SUB>)<SUB>3</SUB>O doped with 5% thulium. Microchip lasers with flat/flat monolithic cavity are operated at room temperature, with Ti:Sapphire laser pumping. Threshold as low as 130 mw of incident pump power and slope efficiency as high as 46% were obtained. The emission spectrum of such microchip lasers appears to be very wide (20 to 30 nm). Laser experiments with laser diode pumping are also reported.

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