Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, Vol.251, 19-31, 1994
Z-Scan Measurements on Liquid-Crystals - Some Considerations and Results
Using the Z-scan technique, we study the intensity dependent response of liquid crystals in geometries where director reorientation is not expected. The dependence of Z-scan results on spatial beam profile is examined by comparison of results obtained from Gaussian and top-hat beams. Effects of response times on the measured nonlinearities are also discussed. Physical mechanisms for the observed optical nonlinearities on the nanosecond timescale are proposed.