Abstract

A partly periodically poled KTiOPO4 (KTP) crystal has been designed to integrate quasi-phase-matched second-harmonic generation (QPM SHG) with sum-frequency generation in one crystal for generating a third-harmonic beam. The highest conversion efficiencies of 45% and 3% have been achieved in our experiments for QPM SHG and third-harmonic generation, respectively, by use of picosecond laser pulses at 1.327 μm. We have also discovered that periodically poled KTP has slightly different indices nz from bulk KTP.

© 2001 Optical Society of America

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