A modified Mach-Zehnder interferometer has been built for measurement of nonlinear-optical susceptibilities in bulk materials. Both slow- and fast-intensity-dependent refractive-index changes can be measured in absolute value, with femtosecond time resolution, high sensitivity, and precision, by means of a new fringe-locking technique. Results on fast nonlinearities of CS2 liquid and glasses are presented.
© 1994 Optical Society of America
L. Sarger, P. Segonds, L. Canioni, F. Adamietz, A. Ducasse, C. Duchesne, E. Fargin, R. Olazcuaga, and G. Le Flem, "Time-resolved absolute interferometric measurement of third-order nonlinear-optical susceptibilities," J. Opt. Soc. Am. B 11, 995- 999 (1994)