title: Measurements of a nonlinear refractive index with a single laser pulse.
abstract: We demonstrate a theoretical model and the experimental proof of a new method for n(2) measurements using single pulses. The advantage of the method is fast measurement, a simple setup, and independence from small nonlinear absorptions and thermal effects. We report on first n(2) measurements with the new technique on carbon disulfide, toluene, and a polymer dissolved in toluene to demonstrate the measurement of positive and negative third-order nonlinearities. We achieved a sensitivity of greater than lambda/200 phase-front distortion using picosecond Nd:YLF laser pulses. The given theory shows that attainment of higher sensitivities is possible.
authors.forename: J
authors.initials: J
authors.lastname: Hein
authors.forename: M
authors.initials: M
authors.lastname: Helbig
authors.forename: S
authors.initials: S
authors.lastname: Rentsch