The Fabry–Perot interferometer has become a standard spectroscopic tool in scientific laboratories for the study of Brillouin scattering. This article examines some basic properties of the Fabry–Perot interferometer with the student or beginning user in mind in order to demonstrate why it is especially useful for this application. Single and complex Fabry–Perot systems in use for Brillouin scattering studies are discussed starting from elementary equations to show, in particular, how the half-width of the transmission function depends upon the instrumental configuration. The primary results are summarized in graphical form.
Elastic constants of the lithium tantalate LiTaO 3 crystal were determined in the hypersonic range by the use of the Brillouin laser light scattering method. Obtained values show variation with respect to ultrasonic measurements. Results are interesting because the same effects are qualitatively different in isomorphic lithium niobate LiNbO 3 crystal.
Propagation vrlocity and tempcraturc dependence of thc sound wave attentuation cocfficient in gadolinium-gallium garnet crystals arc measured. The measurements are carried out in the frequency range 0.4 to 2.0 GHz and tempcrature range 77 to 293 K. On the basis of the measurements Debye temperatnrc, specific heat of crystal as i~ function of temperature, and the temperature dependence of thermal phonon lifetime are determined. For calculation it is assumed t h a t the examined material is isotropic. nmo-ranmnoro rpaIIaTa. k l 3~e p e 1 1~~ 6 1 m~ mmoxeHeHL1 n m a n a a o~e YWTOT 0,4
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