We report on the generation of single-frequency cw ultraviolet radiation from 243 to 247 nm at multimilliwatt power level by double-cavity enhanced 90° phase-matched sum-frequency mixing in ammonium dihydrogen phosphate near room temperature. In two previous papers, Couillaud et al, reported on the generation of single-frequency UV radiation by sum-frequency mixing of a dye laser and an argon-ion laser.1,2

© 1984 Optical Society of America

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