Abstract
The effects of host rare-earth ions (Dy, Gd, Yb) on Bi-substituted garnet film Faraday rotation coefficient (θ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">F</sub> ) variation with temperature were investigated in an effort to improve the isolation of such media used in optical isolators. Even when semiconductor laser wavelength fluctuations (1.310 ± 0.0025 μm) due to environmental temperature change were taken into consideration, observations and calculations showed that in the temperature range 0 to 50°C, the theoretical isolation value for Dy <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2.5</sub> Bi <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.5</sub> Fe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">5</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">12</sub> can exceed 29 dB. The authors determined that (DyBi) <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Fe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">5</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">12</sub> epitaxial film Faraday rotation coefficient (-900 deg/cm, 1.3 μm) has low temperature variation when used as isolator material.
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