We study the factors that ultimately limit the performance of an external enhancement resonator for optical second-harmonic generation (SHG). To describe the resonant SHG process we introduce a theoretical model that accounts for the intensity-dependent cavity loss that is due to harmonic generation and that also includes a realistic assumption about the shape and the frequency width of the laser mode. With the help of this model we optimized the performance of a doubling cavity based on a lithium triborate (LBO) crystal. This cavity was used for frequency doubling the output of a single-frequency titanium-doped sapphire laser at 850 nm. We were able to push the total second-harmonic conversion efficiency to 53% (a 1.54-W pump resulted in 820 mW of second-harmonic light), which to our knowledge is the best result ever reported for a LBO-based doubling cavity.
© 2002 Optical Society of America
[Optical Society of America ]
E. Jurdik, J. Hohlfeld, A. F. van Etteger, A. J. Toonen, W. L. Meerts, H. van Kempen, and Th. Rasing, "Performance optimization of an external enhancement resonator for optical second-harmonic generation," J. Opt. Soc. Am. B 19, 1660-1667 (2002)