Self-frequency doubling is reported in a Nd,Sc(2)O(3):LiNbO(3) single crystal. The Sc(2)O(3) doping produced room-temperature (20 degrees C) 90 degrees noncritical phase matching (theta = 90 degrees 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:LiNbO(3). This simplified the cavity by elimination of the Brewster window needed to force the s-polarized output required for type I phase matching.
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Yamamoto et al. (1994) studied this question.
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