ビスマス多量置換ガドリニウム鉄ガーネットの結晶育成と 0.8μm 光アイソレータへの応用

抄録

Single crystals of highly Bi-substituted gadolinium iron garnets have been grown by an improved flux method in which Bi₂O₃, is used as a flux. Faraday rotation and optical absorption are measured in the near-infrared region at room temperature. The magnetooptical figure of merit is 44deg/dB at 0.78μm in Gd_1.8Bi_1.2Fe₅O₁₂. A very compact optical isolator has been developed for 0.8μm wavelength by using this crystal as a Faraday rotator. The optical isolator features 1.5dB insertion loss and 32 dB backward loss at wavelength of 0.78μm.