Abstract

Pulsed infrared radiation generated by stimulated electronic Raman scattering (SERS) in a cesium vapor heat pipe is used to obtain diagnostic information on HBr in a tungsten halogen lamp. The output of a pulsed excimer-pumped dye laser is Raman shifted from the 470-474 nm region directly into the 3.8 m region. The IR beam is used in an absorption experiment to measure HBr, a key halogen carrying species in tungsten halogen (W-H) lamps, as a function of filament temperature in a W-H lamp. The beam traverses through the center of the coiled filament, and spectra are taken of the R- branch in the v=0 - v=l band for the lamp lit from 0-148 W, corresponding to filament temperatures of 296-2243 K. Molecular rotational temperatures and absolute HBr densities are then derived from the spectra.

© 1990 Optical Society of America