The nonlinear refractive index n2 is an important parameter for use in the design of high-power laser systems, such as the large systems employed in laser fusion research and ultrashort-pulse lasers used in a large variety of laboratory experiments. Empirical relationships have been developed for predicting n2 for low index of refraction optical materials.1 These models predict the dependence of n2 (for a given frequency) on material parameters and on laser frequency (for a given material). The relationships have proved useful in providing guidance for the development of low n2 materials. However, the dispersion in n2 predicted has not been experimentally verified due to the difficulty of making accurate measurements of n2 as a function of wavelength. We report the results of measurements (Table I) of the dispersion in n2 for a variety of optical materials including BK7 and fused silica.

© 1984 Optical Society of America

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