Abstract
Nondegenerate two-photon absorption (ND-TPA) in a zinc blende-type ZnS single crystal has been investigated by using the ultrafast femtosecond pump–probe technique. ND-TPA coefficients for parallel and orthogonal polarization orientations have been determined at discrete probe wavelengths from 480 to 570 nm and a constant pump wavelength of 800 nm. The largest value of is found in the parallel case when probed at 480 nm, whereas the smallest value of appears in the orthogonal case when probed at 570 nm. Optimized scaling factors of 8126 and are proposed for better fitting the experimental dependence of the ND-TPA coefficient on the probe photon energy for the two polarization cases. Considering the intrinsic zinc blende symmetry and crystal orientation, the ND-TPA coefficients for the parallel and orthogonal polarization orientations are related to the imaginary part of two independent third-order susceptibility tensor elements and , respectively.
© 2013 Optical Society of America
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