| 摘要 |
PURPOSE:To obtain a clear interference fringe, by arranging an interferable luminous flux, a plurality of focusing rod lenses, a beam splitter and an optical fiber loop to be integrated optically. CONSTITUTION:A luminous flux leaving an interferring light source 8 enters an light isolator 10 via a focusing rod lens 9. Then, the luminous flux enters focusing rod lenses 11A and 11B to be converted to two focusing luminous fluxes passing through two focuses and then, enters a beam splitter 3 to be equally divided into a transmission light and a reflected light with a halfmirror 3R. The two focusing luminous fluxes transmitted through the halfmirror 3R reach end faces A and B of an optical fiber loop 6. The focusing luminous flux leaving the lens 11A and is made incident efficiently into the end face A of the optical fiber loop 6 and emitted at the end face B as dispersing flux passing around the loop 6 and then, after entering the splitter 3, the dispersing luminous flux is bent at the right angle with the halfmirror 3 to reach an interfering surface 7 passing through an optical spacer 13. Thus, a stable and clear interference fringe can be detected.
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