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| Excited--state nonlinear optical properties of metal cluster W$_{2}$Ag$_{4}$S$_{8}$(dppf)$_{2}$ |
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| 雷明凯大连理工大学材料工程系表面工程研究院 116024 |
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Cite this article:
. Excited--state nonlinear optical properties of metal cluster W$_{2}$Ag$_{4}$S$_{8}$(dppf)$_{2}$. Chin J Mater Res, 2004, 18(6): 668-672.
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Abstract The nonlinear optical effect of metal cluster compound
W$_{2}$Ag$_{4}$S$_{8}$(dppf)$_{2}$ was investigated using frequency--doubled,
Q--switched Nd--YAG pulse laser system with wavelength of 532 nm and pulse width
of 8 ns. The cluster W$_{2}$Ag$_{4}$S$_{8}$(dppf)$_{2}$ possessed reverse
saturation absorption and self--focusing refraction. The nonlinear absorption
and nonlinear refraction of the cluster W$_{2}$Ag$_{4}$S$_{8}$(dppf)$_{2}$ were
explained with excited--state theory. The theoretical results are in agreement
with the experimental data. The ratio of cross--section of the absorption of
the excited--state to that of the ground--state $K_{\rm a}$ and the ratio of
refraction volumes of the excited--state to that of the ground--state
$K_{\rm r}$ were gained based on their simulation of numerical value. The
effective third--order susceptibility $\chi^{(3)}$ was determined for the
cluster. The experiment results show that the cluster
W$_{2}$Ag$_{4}$S$_{8}$(dppf)$_{2}$ has good optical limiting character for
nanometer pulse.
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Received: 30 December 2004
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