Brillouin Hyperfine Spectrometers with “ Green Killer” pump suppression

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.  The combination of these two devices achieves a dynamic ratio of 65dB with our standard CMOS camera and is designated – the Green Killer.  The tunable filter is comprised of a double passed air spaced etalon.  The etalon tuning and alignment are both computer controlled.


LightMachinery’s proprietary fluid jet polishing process is utilized to create both the tunable etalon filter and the main VIPA etalon in the spectrometer.  The result of the combination of the high finesse elements is unparalleled sensitivity and relatively compact size, perfect for Brillouin scattering.
























In addition to the spectrometer, LightMachinery has developed a complete Brillouin system that includes a beam splitter and confocal setup with a microscope and X,Y scanning system to produce complete 2D Brillouin Maps