| 摘要 |
PURPOSE:To remove reflected return light, to eliminate the shift of an optical axis, and to obtain high isolation by arranging Faraday rotators and polarizers slantingly to the optical axis and aligning the optical axes of incident light and projection light with each other. CONSTITUTION:The Faraday rotators 20 and 22 and polarizers 30, 32, 34, and 36 which are optical components are arranged having the normal directions of their incidence and projection surfaces slantingly to the optical axis. The reflected light of the isolator itself is therefore prevented from returning to a light source to obtain the high isolation. Further, the optical axes of the incident light and projection light are aligned with each other, so there is not any possibility of the deviation of the optical axis and the isolator is easily incorporated in a system. Further, the two polarizers 32 and 33 which are positioned at intermediated positions are incorporated in the same polarizer holder 44 slantingly in the same direction, so the overall length can be shortened and axis alignment positions are decreased to improve the operability.
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