Abstract

Self-frequency doubling is reported in a Nd,Sc2O3:LiNbO3single crystal. The Sc2O3 doping produced room-temperature (20 °C) 90° noncritical phase matching (θ = 90°C). Under quasi-cw conditions, 0.14 mW of frequency-doubled 546-nm radiation was produced. The pump-to-green-light conversion efficiency was 11%/W with a 25-mW absorbed input power lasing threshold. Only the fundamental 1092-nm s-polarized oscillation was produced, rather than the p-polarized output, as reported for Nd,MgO:LiNbO3. This simplified the cavity by elimination of the Brewster window needed to force the s-polarized output required for type I phase matching.

© 1994 Optical Society of America

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