Experiments on fs laser-induced transient grating （LITG） in carbon bisulfide （CS2） are carried out to explore the chirp characteristics of a white-light supercontinuum （SC） generated by a 800-nm, 160-fs laser pulse in a 4-mm thick Al2O3 crystal. Two orders of diffraction signals of SC by fs LITG in CS2 are observed, demonstrating that both the third-order process and the fifth-order process are present simultaneously. The experimental results also imply that the formation of an fs transient refractive-index grating in CS2 is mainly due to the electronic polarization process.
