We have demonstrated cw laser operation at wavelengths near 3 microm from monolithic, Er-doped YSGG, GGG, and YAG lasers by direct upper-state pumping in the 0.97-microm wavelength region with either a Ti:sapphire laser or InGaAs diode lasers. We have obtained slope efficiencies as high as 31% and, with diode-laser pumping, output powers of 0.5 W. In addition, we have demonstrated tunable single-frequency operations from Er:YAG.
We have demonstrated one- and two-dimensional Er:YSGG microlaser arrays at 2.8-microm output wavelength with power levels up to 900 mW cw. The one-dimensional microlaser arrays are based on conventional edge-emitting laser diodes, and the two-dimensional microlaser arrays are based on surface-emitting monolithic two-dimensional laser diode arrays with 45-deg deflectors.
We report operation of a laser-diode side-pumped Nd: YAG laser with a novel pumping geometry that ensures efficient conversion of pump energy into the TEM(00) mode. Of the 1064-nm output, 11.8 mJ of energy was obtained in a 200-micros pulse with 64 mJ of pump energy at 808 nm. The overall conversion and slope efficiencies were 18% and 23%, respectively.
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