Abstract
We report distinct laser performance of Yb:Gd crystals cut along different principal optical axes using an unpolarized diode pump. The continuous-wave (cw) laser oscillation generated with y-cut crystal is polarized either with or with depending on the output coupling (T) utilized; a specific leads to a special situation in which the two orthogonal polarization states coexist oscillating at different wavelengths. The laser oscillation achieved with x- and z-cut crystals is also polarized, but with a fixed polarization of and , respectively. The most efficient laser operation is obtained with the y-cut crystal, generating a cw output power of at with an optical-to-optical efficiency of 63%, the slope efficiency being as high as 84%.
© 2008 Optical Society of America
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