Abstract
To improve the contrast of a single Fabry–Perot interferometer, a double Fabry–Perot interferometer was designed. The contrast of this system is ∼7×104 which is ∼30 times as large as that of a single Fabry-Perot interferometer. Using this system, the Brillouin spectrum of gadolinium molybdate crystal, which has a very strong central component, could be observed. The temperature dependence of Brillouin shifts and Brillouin linewidths was measured. Brillouin shifts show softening and Brillouin linewidths show anomalous broadening near the structural phase transition point.
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