Determination of multiphoton absorption coefficient of cadmium iodide using nonlinear transmittance and photoluminescence methods

Abstract Photoluminescence (PL) measurements of cadmium iodide were carried out at the liquid nitrogen temperature (80 K) under pulsed laser excitation. A broad-band luminescence spectrum with its maximum emission around 2.38 eV was observed by the two-photon pumping with radiation from a ruby laser. The two-photon absorption (2PA) coefficient determined by the nonlinear transmittance (NLT) method was found to be 3.9×10 −2 cm/MW. The two-photon and three-photon comparative luminescence measurements were used to estimate the three-photon absorption (3PA) coefficient. The value was found to be 4.5×10 −2 cm 3 / GW 2 .