Holographic nonlinear Raman spectroscopy of large molecules of biological importance

ABSTRACT This paper presents the results of experimental investigations of a series of conformationally inhomogeneouscompounds with polarization sensitive coherent active (anti-Stokes) Raman scattering spectroscopy (PS CARS).Interpretation of vibrational spectra is refined and spectroscopic parameters are determined of resonances of com-plex spectral band of n-penthane (bands at 868 and 841 cm'), 5,5-dimethyl, 2-ethinyle, 1,2-dioxane (bands at 949and 910 ) which were not resolved previously with use of spontaneous Raman scattering spectroscopy (SRS).Thereby the principle of holographic spectroscopy was realized and tested in the full scale. 1. INTRODUCTION Traditional noncoherent spectroscopic techniques, such as luminescence, optical absorption and spontaneouslight scattering, besides their unquestionable importance as experimental tools, possess a cardinal disadvantage due to their irrelevance to phase information, which is contained, in principle, in optical radiation leaving thesample under study. Similar to the situation in optics before the invention of holography, one may say that in