Temperature-scanned Fabry-Perot interferometer using a graded-index rod.
A simple and miniature Fabry-Perot interferometer composed of a graded-index rod is described. When the optical path length of the rod is scanned by temperature variation, the interferometer works as an element for observing the spectrum of a gas laser. With this element, we can readily determine the number of axial modes, their relative intensities, and the frequency separation between them.
Nemoto
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Institute of Materials Science, University of Tsukuba, Sakura-mura, Ibaraki 305, Japan.