抄録
A measurement on the dependence of two photon absorption coefficient on the polarization angle of light in thallous chloride was performed. Two polarized light beams, one from Nd-glass laser and another from Xe-flash lamp, were made incident on the sample from the antiparallel directions, and the directions of both polarizations were rotated. The angular dependence was found to belong mostly to A1g representation in octahedral group from the band edge (∼3.56 eV) to as high as 4.2 eV. But the angular dependence was found to change at higher energy, and Ng component seemed to mix with A1g. Two photon absorption spectra at liquid nitrogen temperature confirmed the assumption that the two photon transition spectrum was of the second class. A discussion about the method of analysis for this type of transition is presented.
