Abstract
An outline of new nonlinear spectroscopic methods which are developed for13 measuring ultrashort relaxation times of excited states in a range of 10−13– 10−14 s. They are all based on the third-order nonlinear optical processes in resonant media with two kinds of input light beams. Both the frequency-domain (stationary) and time-domain (transient) methods are developed with particular emphasis on the measurement of dephasing time T2. Resonant Rayleigh-type mixing and resonant Kerr effect are typical of the former, while transient spatial parametric effect is typical of the latter. A description of subpicosecond dye laser work necessary as a source for the time-domain measurement is also given. All the theories are based on the semiclassical description of the system with density matrix formalism incorporating phenomenological relaxation times. The S0 → Sl electronic transitions of dye molecules in both liquids and solids were selected as main objects of the present study.
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Yajima, T., Souma, H., Ishida, Y., Taira, Y. (1980). Relaxation Study in the Extremely Short Time Region by Stationary and Transient Nonlinear Optical Spectroscopy. In: Kubo, R., Hanamura, E. (eds) Relaxation of Elementary Excitations. Springer Series in Solid-State Sciences, vol 18. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-81482-2_8
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DOI: https://doi.org/10.1007/978-3-642-81482-2_8
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