Ultrafast third-order optical nonlinearities in DMSO

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/cm 2 .

Element Selected Spin-Dependent d-d Charge Transfer Transitions in Bi2FeMnO6 Film: An Ultrafast Pump-Probe Study

“…The electronic properties in condensed matters directly show their physical properties. The interplay among the electron, lattice and spin degrees of freedom in multiferroic and other correlated electron materials can be studied in the time domain by ultrafast spectroscopy [14,15]. The ultrafast d-d transfer blue shift is found in YMnO 3 which shows the connection between the d-electron charge transfer band gap and the macroscopic magnetism in multiferroics [16].…”