Silica Raman scattering probe for absolute calibration of Thomson scattering spectrometers

We have developed a solid state probe for an absolute irradiance calibration of the Thomson scattering system on the Large Plasma Device (LAPD), based on Raman scattering off silica. Measurements performed with a triple-grating spectrometer have investigated the intensities of a pulsed laser beam Raman scattered off crystalline and amorphous silica over a range of temperatures of relevance to the LAPD (299-498 K). The data were compared with Rayleigh and Raman scattering intensities in gaseous nitrogen. The measurements show that Raman scattering off quartz allows rapid and accurate alignment and calibration of Thomson scattering systems in plasma physics experiments that cannot be calibrated using conventional methods.

Automated summary

A solid state probe based on Raman scattering off silica has been developed for absolute irradiance calibration of Thomson scattering systems on the Large Plasma Device (LAPD). This probe allows rapid and accurate alignment and calibration, especially in plasma physics experiments that cannot be calibrated using conventional methods.