We frequency doubled the single-frequency beam from an external-cavity tapered laser diode operating at 780 nm in a resonant cavity containing a β -barium borate crystal to generate an output at 390 nm with high efficiency. Output powers as great as 233 mW were obtained, corresponding to an efficiency of 65%/W . The resonant-cavity design was a low-loss three-mirror configuration that provided compensation for astigmatism and coma. The laser diode frequency was locked to the doubling-cavity resonance by use of the Hänsch–Couillaud discrimination technique.
© 1999 Optical Society of America
(140.2020) Lasers and laser optics : Diode lasers
(140.3610) Lasers and laser optics : Lasers, ultraviolet
(140.4780) Lasers and laser optics : Optical resonators
(160.4330) Materials : Nonlinear optical materials
(190.2620) Nonlinear optics : Harmonic generation and mixing
J. D. Bhawalkar, Y. Mao, H. Po, A. K. Goyal, P. Gavrilovic, Y. Conturie, and S. Singh, "High-power 390-nm laser source based on efficient frequency doubling of a tapered diode laser in an external resonant cavity," Opt. Lett. 24, 823-825 (1999)