Abstract
Utilization of organic crystals in various, devices for quadratic nonlinear optics, e.g., frequency doublers, parametric amplifiers or autocorrelators, was motivated by the exceptional nonlinear susceptibilities and factors of merit of these materials, allowing for exceptional performances in terms of conversion yields or amplification factors. However, these improvements are generally hindered by a reduced transparency and a moderate (~100 MW cm2 in the visible for nanosecond laser pulses) damage threshold.1 Previous preliminary studies on a cyclic urea derivative, 5-nitrouracil (5-NU)2 are being revived and completed with emphasis on the determination of damage threshold and precise evaluation of linear and nonlinear optical properties, taking advantage of the interesting features of urea in terms of transparency and damage threshold,3 associated to a large quadratic susceptibility.
© 1992 Optical Society of America
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