Simultaneous rotational coherent anti-Stokes Raman spectroscopy and coherent Stokes Raman spectroscopy with arbitrary pump-Stokes spectral separation.

A new approach to pure rotational coherent anti-Stokes Raman spectroscopy (CARS) and coherent Stokes Raman spectroscopy (CSRS) is demonstrated in which the pump and broadband Stokes lasers that are mixed have a large and arbitrary spectral separation. In this method, the rotational Raman coherences are established by different frequency components within the single, broadband Stokes source. The narrow band then scatters from the excited coherences, producing CARS and CSRS simultaneously.

Spatially resolved coherent anti-Stokes Raman spectroscopy from a line across a CH(4) jet.

A large-angle phase-matching geometry that yields spatially resolved coherent anti-Stokes Raman generation along a line is demonstrated. Preliminary results of applying this technique to measure the CH(4)-concentration distribution along a line in a jet flow field are presented.

Coherent anti-Stokes Raman spectroscopy: spectra of water vapor in flames.

The coherent anti-Stokes Raman spectroscopy (CARS) spectrum of water vapor in flames is reported. Experimentally scanned CARS spectra display excellent agreement with computer-synthesized CARS signatures.