RESONANCE COHERENT ANTI-STOKES-RAMAN SCATTERING IN NITROGEN-DIOXIDE USING A BROAD-BAND DYE-LASER

We have applied electronically resonant coherent anti-Stokes Raman sca ttering (CARS) to the detection of nitrogen dioxide. The resonance CAR S spectrum of NO2 in a sample cell was recorded around a Raman shift o f 1500 cm(-1) using a frequency-doubled injection-seeded single-mode N d:YAG laser and a tunable dye laser. In particular, we demonstrate the use of a broadband Stokes laser to measure resonance CARS spectra of NO2. Recordings at various pump laser frequencies were made by tempera ture tuning of the Nd:YAG master laser. The pressure dependence of the signal was also investigated. The resonance CARS results are compared with laser-induced fluorescence measurements. The work shows the high resolution achievable in complex molecular spectra using resonance CA RS.