Abstract

The linear and quadratic nonlinear-optical properties of the orthorhombic P 212121 5-nitrouracil (5NU) molecular crystals are fully characterized. d14 measurements, performed by two different methods, and second-harmonic conversion efficiencies are reported. Collinear phase-matching configurations for sum-frequency generation are both calculated in the special case of third-harmonic generation and experimentally demonstrated. 5NU permits, in particular, efficient blue-light generation from a pulsed, 1.34-μm Nd3+:YAG laser source by a sequence of second-harmonic and (2ω, ω) sum-mixing processes. The good stability in air and the high damage threshold are accounted for by the presence of hydrogen bonds in the crystalline structure.

© 1993 Optical Society of America

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