Temperature Dependence and Nulmerical Analysis of Negative Nonlinear Absorption Effect in Erbium-Yttrium Aluminum Garnet

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  • Maeda Yoshinobu
    Department of Information and Control Engineering, Toyota Technological Institute, 2–12–1 Hisakata, Tempaku, Nagoya 468–8511, Japan
  • Yamada Toshikazu
    Production Fundamental Division, Chugoku National Industrial Research Institute, 2–2–2 Suehiro, Hiro, Kure 737–0197, Japan
  • Imai Shiho
    Department of Information and Control Engineering, Toyota Technological Institute, 2–12–1 Hisakata, Tempaku, Nagoya 468–8511, Japan
  • Migitaka Masatoshi
    Department of Information and Control Engineering, Toyota Technological Institute, 2–12–1 Hisakata, Tempaku, Nagoya 468–8511, Japan

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タイトル別名
  • Temperature Dependence and Numerical Analysis of Negative Nonlinear Absorption Effect in Erbium-Yttrium Aluminum Garnet.
  • Temperature Dependence and Nulmerical A

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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 4I15/2-4I9/2 and 4I13/2-2H11/2 transitions of Er3+ in the YAG at 400 K 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 Er3+ ion. It is suggested that the NNA effect weakened at the low temperature because the number of phonons decreased due to the low temperature.

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