Anti-stokes emission in an additively colored KCl caused by excitation with a Nd: YAG laser |
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| Authors: | Hiromasa Hanzawa Yuzo Mori Hiroshi Ohkura |
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| Institution: | 1. Faculty of Engineering Science , Osaka University;2. Department of Applied Physics , Osaka City University , Sumiyoshi-ku, Osaka, 558;3. Faculty of Engineering , Okayama University of Science |
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| Abstract: | Abstract We have observed the quadratic laser power dependence of two anti-Stokes emission bands at 15100cm?1 and 14000cm?1 in an additively colored KCl when excited with a Nd:YAG laser. The cross section of two photon absorption to cause the 14000cm?1 band is estimated to be 4×10?40cm4sec. We have observed that emission intensities are dependent on temperature in the range between 4. 2K and 130K. They are enhanced by means of optical bleaching and also with the increase of the F concentration. From a qualitative analysis of these observations, we propose that these emissions are correlated to the loose aggregation of the F centers. |
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| Keywords: | F center loose aggregation of F centers two photon excitation anti-Stokes emission lattice relaxation |
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