An Increase of More Than 30% in the Electrooptic Coefficients of Fe-Doped and Ce-Doped Stoichiometric LiNbO3 Crystals.

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  • Kondo Yukiko
    Advanced Research Institute for Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan
  • Fukuda Takeshi
    Graduate School of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan
  • Yamashita Yuri
    Graduate School of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan
  • Yokoyama Koichi
    Graduate School of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan
  • Arita Kanji
    School of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan
  • Watanabe Masato
    Graduate School of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan
  • Furukawa Yasunori
    National Institute for Research in Inorganic Materials, 1-1 Namiki, Tsukuba 305-0044, Japan
  • Kitamura Kenji
    National Institute for Research in Inorganic Materials, 1-1 Namiki, Tsukuba 305-0044, Japan
  • Nakajima Hirochika
    Advanced Research Institute for Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan Graduate School of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan School of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan

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  • Increase of More Than 30パーセント in the Electrooptic Coefficients of Fe Doped and Ce Doped Stoichiometric LiNbO3 Crystals
  • An Increase of More Than 30% in the Electrooptic Coefficients of Fe-Doped and Ce-Doped Stoichiometric LiNbO<sub>3</sub> Crystals

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Abstract

The composition dependences of the electrooptic coefficients in LiNbO3 crystals and the influence of doping with Ce-ions and Fe-ions were measured precisely and investigated in detail for the first time. The electrooptic coefficient r33 increases with an increase in the Li/Nb ratio. The r33 in stoichiometric LiNbO3 crystal was 1.14 times as large as that in conventional congruent LiNbO3 crystal whose electrooptic coefficient is 32.6 pm/V. The electrooptic coefficient r33 is also increased by doping with some ions. An increase of more than 30% in electrooptic coefficients (from those in nondoped congruent LiNbO3) can be obtained by doping with Ce- or Fe-ions.<BR> The lattice constants are also measured. The lattice constant along the c-axis decreases with an increase in the Li/Nb ratio, or by doping with Ce- or Fe-ions, and in this way the crystal structure changes into a less symmetric structure. This may be the reason why the electrooptic coefficient increases with an increase in the Li/Nb ratio or by doping with Ce- or Fe-ions.

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