The great challenge with Brillouin spectroscopy is that the scattered signal from the un-shifted wavelength of the laser can overwhelm the small Brillouin shifted return signal.   So, we have combined our leading-edge HyperFine spectrometer with a very narrow band tunable filter to suppress the bright un-shifted laser frequency.   The tunable filter is easily adjusted to suppress the main laser peak and exposure gating is used by the HyperFine Spectrometer to drastically increase the full dynamic range of the instrument.

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