Abstract

Absolute magnitudes of the effective nonlinearity, d eff, were measured for seven KTP and six BBO crystals. The d eff’s were derived from the parametric gain of an 800-nm signal wave in the sample crystals when they were pumped by the frequency-doubled, spatially filtered light from an injection-seeded, Q-switched Nd:YAG laser. The KTP crystals, all type II phase matched with propagation in the XZ plane, had d eff values ranging from 1.97 to 3.50 pm/V. Measurements of gain as a function of phase velocity mismatch indicate that two of the KTP crystals clearly contain multiple ferroelectric domains. For five type I phase-matched BBO crystals, d eff ranged from 1.76 to 1.83 pm/V, and a single type II phase-matched BBO crystal had a d eff of 1.56 pm/V. The uncertainty in our measurements of d eff values is ±5% for KTP and ±10% for BBO.

© 1996 Optical Society of America

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