The fifth-order nonlinearity of CS₂

Abstract

Nonlinear refraction and absorption in carbon disulfide (CS2) has been investigated using the Z-scan technique with a femtosecond pulse laser at a wavelength of 800 nm in a broad intensity range. It is found that the origin of nonlinearity depends on the laser intensity. At low intensity, the nonlinearity is mainly due to the third-order process. The third- and fifth-order processes are at present simultaneously at high intensity. We also find the critical intensity value which determines whether the fifth-order nonlinear process exists or not by analysis of the divided Z-scan curves at different intensities. The nonlinear absorption is attributed to the three-photon absorption and the nonlinear absorption coefficient is 1.37 × 10−27 m3 W−2.

Polarization-induced fluorescence modulation in a self-assembled coordination cage-shaped complex

“…Before dealing with the sample, the Z-scan experiment on CS 2 with a thickness of 1 mm was first performed for testing and calibration. Through measurement and calculation, the third-order nonlinear refractive index of CS 2 was evaluated to be 2.6 × 10 −19 m 2 ∕W, which was in good agreement with previous measurements at this range of pulse duration (2.5 × 10 −19 m 2 ∕W, 3 × 10 −19 m 2 ∕W) [19,20]. So it might be certain that the experiment setup was working normally.…”

Filamentation of light in carbon disulfide

“…Indeed, measurements performed at moderate intensities have provided the values n 4 = (1. 1.064 μm [15], in contrast to n 4 = −2 × 10 −35 m 4 /W 2 at 800 nm [19] or n 4 = −5.2 × 10 −35 m 4 /W 2 at 920 nm [10]. The change in the sign of n 4 with wavelength is related to the location of the third harmonic with respect to the absorption bands of the material.…”

“…However, Kong et al have reported an appreciable three-photon absorption γ at 800 nm [19]; they also found the value of γ = 1. 200 nm [10], which is approximately the third harmonic λ/3 of the wavelength λ = 532 nm.…”

Saturation of the Kerr effect in carbon disulfide

“…Indeed, measurements performed at moderate intensities have provided the values n 4 = (1.2 ± 0.3)×10 −32 m 4 /W 2 at λ = 532 nm, n 4 = (2.2 ± 0.4)×10 −33 m 4 /W 2 at λ = 1.064 µm [8], in contrast with n 4 = −2×10 −35 m 4 /W 2 at 800 nm [10], or n 4 = −5.2×10 −35 m 4 /W 2 at 920 nm [3]. The change in the sign of n 4 with wavelength is related to the location of the third harmonic with respect to the absorption bands of the material.…”