Abstract
In this brief technical note, we measure the Rayleigh scattering of sulfur hexafluoride (SF6) at 1.066 microns using cavity ringdown spectroscopy to determine the difference in optical loss between Helium and SF6. By empirically verifying previous calculations, we provide further confidence in using SF6 as a calibration species for near-infrared scattering. The method can be readily extended to measuring other gases and wavelengths.