Two-photon spectroscopy of point defects
نویسندگان
چکیده
The experimental results on two-photon spectroscopy in impurities and defects in solids are reviewed. The main results are the measurement of absorption cross sections and in some cases the assignement of the symmetry of the transitions. Nonlinear effects can be of importance also in the process of colour centre formation in alkali halides crystals.
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