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Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Hirotaka Kawai.
Japanese Journal of Applied Physics | 1996
Toshiyasu Suzuki; Hirotaka Kawai; Hiromitsu Umezawa
We report on the finding of a Bi-substituted Sm-containing iron garnet film ( La0.08Sm2.15Bi0.77Fe5O12) that realizes a high Faraday rotation stability against wavelength variation in the 1.3 µm band. This stability resulted from the peaks in the Faraday rotation at 1.24 µm and 1.38 µm due to Sm3+ ions. We calculated that such isolators could provide a 60 nm bandwidth in which the isolation would be maintained at 35 dB or higher. In addition, we discussed the relationship between the bandwidth and film composition.
Archive | 2000
Hirotaka Kawai; Hiromitsu Umezawa
Archive | 1994
Kazuyoshi Hakamata; Hirotaka Kawai; Hiroshi Rikukawa; Hiromitsu Umezawa; 浩光 梅沢; 博貴 河合; 和喜 袴田; 弘 陸川
Archive | 2001
Teruhisa Sahashi; Hidenori Nakada; Hirotaka Kawai; Isao Kojima; Tsugio Tokumasu
Archive | 1998
Hirotaka Kawai; Hiromitsu Umezawa; Youichi Suzuki; Hidenori Nakada
Archive | 2004
Teruhisa Sahashi; Hidenori Nakada; Hirotaka Kawai; Isao Kojima; Tsugio Tokumasu
Archive | 1995
Toshiyasu Suzuki; Hirotaka Kawai; Hiromitsu Umezawa
Archive | 2011
Hiroaki Ono; Hidenori Nakada; Hirotaka Kawai; Yuko Ota; Taro Nakamura
Archive | 1995
Hirotaka Kawai; Shinzo Fujii; Hiromitsu Umezawa
Archive | 2011
Hiroaki Ono; 博章 小野; Hidenori Nakada; 中田 英則; Hirotaka Kawai; 博貴 河合; Yuko Ota; 大田 猶子; Taro Nakamura; 中村 太郎
