Introduction

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 Pump 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.  Brillouin measurements are now possible with a greater than 50X speed improvement over current technologies.   Welcome to a new world of Brillouin measurements, where data can be collected quickly and easily.

• Features

u Computer controlled alignment and adjustment

u High throughput enabling fast acquisition

u 80dB contrast and high pump suppression

u High resolution and high precision

u Easy to Use

u Large spectral range covered in a single shot

u Simple integration - compact size

u An affordable device that is ready to use out of the box