The performance of a flash-lamp-pumped Cr:LiSAF unstable laser resonator utilizing a fourth-order super-Gaussian variable reflectivity mirror as an output coupler is described. The super-Gaussian mirror results in a smooth, flattop transverse beam profile in the near field that is advantageous for nonlinear frequency-conversion applications. Long-pulse and <i>Q</i>-switched operation of the Cr:LiSAF unstable laser resonator are described and compared with stable resonator operation. We obtained tunable ultraviolet radiation extending from 267 to 290 nm by frequency mixing the<i>Q</i>-switched Cr:LiSAF laser output with lithium triborate and β-barium borate nonlinear crystals.
© 1998 Optical Society of America
(140.0140) Lasers and laser optics : Lasers and laser optics
Joseph F. Pinto and Leon Esterowitz, "Unstable Cr:LiSAF Laser Resonator With a Variable Reflectivity Output Coupler," Appl. Opt. 37, 3272-3275 (1998)