Abstract

Simultaneous generation of second-harmonic light with orthogonal polarizations in the blue spectral region is demonstrated by use of type II and type I quasi-phase matching for the nonlinear coefficients d33, d24, and d32 in periodically poled KTP. The second-harmonic power ratio in both polarization states can be tuned by the fundamental polarization and (or) the periodically poled KTP temperature. Femtosecond pulse frequency-doubling efficiencies of as much as 39.5% W-1 and 8.1% W-1 are demonstrated in 7-mm periodically poled KTP for type I and type II processes, respectively. The efficiency limitations caused by various effects of the group-velocity mismatch are discussed.

© 2002 Optical Society of America

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