Physics
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spie.3172..656f&link_type=abstract
Proc. SPIE Vol. 3172, p. 656-665, Optical Technology in Fluid, Thermal, and Combustion Flow III, Soyoung S. Cha; James D. Trolin
Physics
1
Scientific paper
We present two novel narrow passband spectral filters capable of frequency resolved imaging of rotational Raman light scattering with strong spectral rejection of out-of- band Raman, Rayleigh and Mie scattering. The first filter, capable of 2D imaging and spectral selectivity, is based on mercury vapor absorption and subsequent resonant florescence. The second filter exploits the variation in the index-of-refraction near resonance to spatially resolve small spectral shifts. It is capable of simultaneous 1D measurements of multiple frequencies. Each filter has a spectral sensitivity of better than 1 cm-1. The filters are paired with an injection seeded, cavity locked, frequency tripled Ti:Sapphire laser which produces > 30 mJ pulse of single mode, tunable light in the vicinity of 253.7 nm. The laser and resonant fluorescence filter are combined to spectrally resolve scattering form individual rotational Raman lines of nitrogen and oxygen. A description of each filter is given.
Finkelstein Noah D.
Lempert Walter R.
Miles Richard B.
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