The nonlinearity of lead and germanium based films with thickness of 1.5μm was studied using a mode-locked picosecond Nd:YAG laser at 1064nm and its second harmonic at 532nm. Nonlinear refractive indices of ≈10−16m2∕W and two-photon absorption coefficients varying from ≈102cm∕GW at 1064nmto≈103cm∕GW at 532nm were measured. The results show that the films have potential applications in optical limiting devices.
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Araújo et al. (2007) studied this question.
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