| Abstract: | A detailed theoretical analysis of the two-photon absorption spectra for YAG: Nd3+ and YLF: Nd3+ crystals was carried out in the 1.06 μm region with calculations of both the relative intensities between individual Stark sublevels of the4I9/2→4G7/2 transition of an Nd3+ ion and the integral two-photon absorption crosssections. The results of calculations agree well with experimental data. Reasons why the explanation of the experimental data given in [3] is very unsatisfactory and largely doubtful in itself are indicated. In conclusion, a relatively simple experiment is suggested that could give an unambiguous answer to some questions of the theoretical analysis performed. B. I. Stepanov Institute of Physics, Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 2, pp. 184–189, March–April, 1997. |
