Spectral profile of the two-photon absorption coefficients in CaF2 and BaF2
- 22 April 2002
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 80 (16) , 2883-2885
- https://doi.org/10.1063/1.1471939
Abstract
Two-photon absorption spectra due to the valence excitons in CaF2 and BaF2 have been measured using the second harmonic of the output of a XeCl-excimer-laser pumped dye laser as a light source. The band gap energies of CaF2 and BaF2 are obtained as 11.8 and 10.6 eV at 298 K, respectively. The two-photon absorption coefficient β in the spectral region below the 2P exciton is expressed by an exponential function of the photon energy in both crystals. The values of β at the 2P exciton peak are about 2×10−9 cm/W for CaF2 and 3×10−9 cm/W for BaF2.Keywords
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