Temperature Dependence and Numerical Analysis of Negative Nonlinear Absorption Effect in Erbium-Yttrium Aluminum Garnet
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概要
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The temperature dependence of the negative nonlinear absorption (NNA) effect was investigated in an erbium-doped yttrium aluminum garnet (YAG) crystal using a 787.3 nm laser diode. The NNA effect was obtained in a temperature range of 15 to 400 K. An absorption peak corresponding to both the ^4I_<15/2>-^4I_<9/2> and ^4I_<13/2>-^2H_<11/2> transitions of Er^<3+> in the YAG at 400K was displaced from that at 300 K. It is considered that the NNA effect weakened at high temperature because the absorption cross section decreased due to the shift of the absorption peak. In addition, the dependence of the NNA effect on the modulation degree was investigated. The characteristic of the increase in the incident laser intensity was almost the same as that for the decrease. It was confirmed that the mechanism of the NNA effect can be explained by calculating the rate equations based on an analytical model for a five-level system of the Er^<3+> ion. It is suggested that the NNA effect weakened at the low temperature because the number of phonons decreased due to the low temperature.
- 社団法人応用物理学会の論文
- 1998-06-30
著者
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YAMADA Toshikazu
Production Fundamental Division, Chugoku National Industrial Research Institute
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Yamada Toshikazu
Production Fundamental Division Chugoku National Industrial Research Institute
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Migitaka Masatoshi
Department Of Information And Control Engineering Toyota Technological Institute
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Maeda Yoshinobu
Department Of Information Engineering Faculty Of Engineering Niigata University
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IMAI Shiho
Department of Information and Control Engineering, Toyota Technological Institute
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Imai Shiho
Department Of Information And Control Engineering Toyota Technological Institute
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Maeda Yoshinobu
Department Of Electrical Engineering University Of Pittsburgh
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