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.
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