Abstract
We have succeeded in measuring dynamic light scattering spectra (Rayleigh line and Brillouin doublet) of simple liquids in an ultrawide frequency range (0–3 GHz) by applying a new optical superheterodyne method using frequency-tunable lasers. Its frequency resolution (∼300 kHz) is determined by the short-time coherency between the two lasers. It is a great advantage of our method over the conventional optical beating methods that the speed of the photodetector never limits the upper frequency bound. This is realized by the continuous tunability of the laser frequency. The method has a high potential for studying the dynamics in a wide class of condensed matter.
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