Abstract
The third-order optical nonlinearities of dimethyl sulfoxide (DMSO) are investigated
using the optical Kerr effect (OKE) and Z-scan techniques with femtosecond pulses. We are able to
fit the OKE signal theoretically by convolving the autocorrelation of the incident pulse intensity
profile with the impulse responses of the samples, illustrating the instantaneous nonlinear response
of DMSO. We verify that the purely electronic cloud distortion causes the observed signal for DMSO.
The Z-scan technique is used to estimate the third-order susceptibility of DMSO, which is about a
quarter of that for CS2 and mainly comes from the nonlinear refraction with an intensity of less
than 140 GW/cm2.
© 2012 Chinese Optics Letters
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