FIBEROPTICS BRILLOUIN-SCATTERING SPECTROMETER

A simple and versatile spectrometer for obtaining Brillouin spectra from condensed matter is described. It utilizes optical fibers in the scattered light paths and is designed in such a way that alignment of the whole setup can be achieved and maintained easily. The spectrometer can automatically record spectra from two samples successively, where one of these samples can be used as a reference. A novel computer stabilization procedure which is able to maintain the finesse of the Fabry-Perot interferometer for long periods of time is also described.