We demonstrate the existence of χ(5) nonlinearities induced in a transparent glass by intense femtosecond pulses at 620 nm. Polarization selectivity associated with a transient-grating technique allows us to discriminate this contribution from the electronic third-order one. A value of 5 is measured for the ratio between symmetric and nonsymmetric elements for this fifth-order susceptibility. This value corresponds to the expected value deduced from the anharmonic model presented and is definitely attributed to a direct six-wave mixing process.
© 1993 Optical Society of America
J. Arabat and J. Etchepare, "Nonresonant fifth-order nonlinearities induced by ultrashort intense pulses," J. Opt. Soc. Am. B 10, 2377-2382 (1993)