Abstract
When a light beam passes through any medium, the effects of interaction of light with the material depend on the field intensity. At low light intensities the response of materials remain linear to the amplitude of the applied electromagnetic field. But for sufficiently high intensities, the optical properties of materials are no longer linear to the amplitude of applied electromagnetic field. In such cases, the interaction of light waves with matter can result in the generation of new frequencies due to nonlinear processes such as higher harmonic generation and mixing of incident fields. One such nonlinear process, namely, the third order nonlinear spectroscopy has become a popular tool to study molecular structure. Thus, the spectroscopy based on the third order optical nonlinearity called stimulated Raman spectroscopy (SRS) is a tool to extract the structural and dynamical information about a molecular system. Ultrafast Raman loss spectroscopy (URLS) is analogous to SRS but is more sensitive than SRS. In this paper, we present the theoretical basis of SRS (URLS) techniques which have been developed in our laboratory.
The fundamentals of non-linear optical spectroscopy are presented. The theory is extended to understand the third order non-linear Raman spectroscopic techniques named as stimulated Raman spectroscopies. A systematic method to describe the Ultrafast Raman loss spectroscopy (URLS), a third ordered nonlinear Raman process, is also presented.
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Dedicated to Prof. N Sathyamurthy on his 60th birthday
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RAI, N.K., LAKSHMANNA, A.Y., NAMBOODIRI, V.V. et al. Basic principles of ultrafast Raman loss spectroscopy# . J Chem Sci 124, 177–186 (2012). https://doi.org/10.1007/s12039-012-0214-8
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DOI: https://doi.org/10.1007/s12039-012-0214-8