Abstract
A diode-pumped microchip laser containing a quasi-monolithic plano–plano cavity is realized on the basis of a crystal. The maximum CW output power is 3.2 W (at an absorbed pump power of 6.8 W) and the slope efficiency as high as 50.4%. The laser is operating at 1946 nm in the mode with a . Microchip operation with is, in principle, due to a special crystal cut along the optical indicatrix axis. This crystal cut possesses positive near-spherical thermal lens that provides the required mode stabilization in the plano–plano cavity. Sensitivity factors of the thermal lens, “generalized” thermo-optic coefficients and constants describing the photoelastic effect are determined for the monolithic crystal.
© 2014 Optical Society of America
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