Investigation of nonlinear characteristics of CS2 with femto-second pulsed Z-scan technique

Nonlinear refraction and absorption properties in carbon disulfide(CS2) have been investigated by Z-scan technique under femtosecond pulse lasers at 800 nm in a broad intensity range. It is found that the Z-scan transmittance curve has a large displacement on the axis with the increase of intensity. At low intensity, it is mainly due to two-photon absorption effect, while the fifth-order processes and two-photon absorption are at present simultaneously at high intensity. The critical intensity which determines the existence of the fifth-order nonlinear process is presented, along with the relationship between the axial displacement and some parameters of the transmittance curves.