Abstract
AbstractThe application of a multiple‐pass gas cell to quasi‐cw stimulated Raman scattering is demonstrated to be a powerful method for significantly increasing the sensitivity. As a consequence, such a device offers the possibility of working in the 0.1–1 Torr pressure range for weak bands. As a striking example, experimental results are given for the 2ν2 band of CO2 at 1285 cm−1. The band is almost completely resolved with a very good signal‐to‐noise ratio. The Raman frequencies and the collisional broadening coefficients are determined as a function of quantum number J. Moreover, the possibility of auto‐stimulated Raman effect on CO2 at moderate pressure via the sharp ν1 band (1388 cm−1) is demonstrated. The first Stokes signal has been measured with a very narrow line width.
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