Resonating both inputs at 532 nm and 1064 nm in an extemal resonator, sum-frecluency output at 355 nm was obtained A type-I phase-matched BBO crystal that is fabricated at near-Brewster cut served as the nonlinear medium, maintaining the low-loss at both input wavelengths. 220 mW of cw ultraviolet output at 355 nm was obtained.

© 1996 Optical Society of America

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