| Autor: |
Kondo, Yuki, Kuroiwa, Yutaka, Sugimoto, Naoki, Manabe, Tsuneo, Ito, Setsuro, Yoko, Toshinobu, Nakamura, Arao |
| Zdroj: |
Journal of the Optical Society of America B: Optical Physics; April 2000, Vol. 17 Issue: 4 p548-554, 7p |
| Abstrakt: |
We investigate the effect of irradiation by a UV pulse laser on the third-order optical nonlinearity of CuCl-microcrystallite-doped glass as a function of the irradiation’s shot number, energy density per pulse, and wavelength. The response time τ is estimated from the luminescence decay time of the CuCl excitons. The absolute value of the third-order nonlinear susceptibility χ^(3) is measured by degenerate four-wave mixing. Values of both τ and χ^(3) decrease after UV irradiation. The figure of merit for the optical nonlinearity, χ^(3)/ατ, where α is the absorption coefficient, is almost constant before and after UV irradiation and is approximately 500 esu cm s^−1 in the case of 8-nm CuCl microcrystallites. This value is 1 order of magnitude larger than that of CdS_xSe_1−x-microcrystallite-doped glasses. The mechanism by which τ and χ^(3) are decreased is discussed, considering defects levels formed at the interface between CuCl microcrystallites and glass matrix. |
| Databáze: |
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