EXPERIMENTAL-VERIFICATION OF BACKSCATTERING CARS SPECTROSCOPY ON OPAQUE MEDIA

The applicability of a recently suggested coherent anti-Stokes Raman s pectroscopic (CARS) reflection technique to investigations of strongly absorbing materials was tested. The underlying principle is that the CARS signal generated in the surface layers of the sample is detected as a beam which is backscattered from the surface of an opaque medium rather than in transmission. A special experimental arrangement was us ed which allowed CARS spectra to be obtained with reasonable signal st rength. As an example, experimental results for a TS6 (hexa-2,4-diynyl ene di-p-toluenesulphonate)polydiacetylene single crystal are presente d. Spectra obtained at different angles of incidence are discussed.