Abstract

Coherent anti-Stokes Raman scattering is demonstrated as a quantitative diagnostic in low-density flows by mapping H2 velocity and translational temperature inside and outside the nozzle of a resistojet. A spatial resolution of better than 35 µm along the flow direction and 350 µm transverse to it was attained in a density as low as 5 × 1015 cm-3. The accuracy of the velocity, inferred from the Doppler shift of the Q(1) Raman resonance, was limited by the scan linearity of the laser to ±0.2 km/s. Translational temperatures, inferred from linewidths and complicated by saturation and ac Stark effects, had an accuracy of ∼20%. A discussion of applicability to molecular nitrogen is presented.

© 1997 Optical Society of America

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