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22 November 2011 Temperature dependences of fluorescence characteristic for Nd/Cr:YAG materials
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Cr3+ co-doped Nd:YAG is very useful for the flashlamp or solar pumped laser through Cr3+ ion has broad absorption bands in the visible region and an efficient energy transfer caused from Cr3+ to Nd3+. But the process of the energy transfer is not understood well. It is also a problem that the absorption at near infrared is appeared with changes of Cr3+ to Cr4+. We investigated these problems by measuring the temperature dependence of fluorescence characteristics (lifetime, excitation fluorescence and absorption) and the change after UV irradiation. The excitation fluorescence spectra at 450 K increased because the Cr3+ absorption depended on temperature. The fluorescence lifetime excited at the Cr3+ absorption bands shortened with increase temperature, that is, the energy transfer time will be short. Solarization was appeared in Nd/Cr:YAG ceramics irradiated by KrF excimer laser pulses at 248 nm.
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Yoshiyuki Honda, Minoru Yoshida, Shinji Motokoshi, Kana Fujioka, Takahisa Jitsuno, and Masahiro Nakatsuka "Temperature dependences of fluorescence characteristic for Nd/Cr:YAG materials", Proc. SPIE 8190, Laser-Induced Damage in Optical Materials: 2011, 819014 (22 November 2011);


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