Preferred Label : photon echo;
IUPAC definition : Time-resolved optical spectroscopy in which the inhomogeneous broadening of absorbers
is eliminated by the proper choice of geometry in a four-wave mixing experiment.;
Scope note : technique used, e.g., to probe solvation dynamics upon (ultra-short) pulse excitation
of a chromophore.; in terms of mathematical description, the photon echo is equal to the spin echo (solid-state
physics) from which a term echo was borrowed.; photon echo techniques make use of the third-order optical polarization and hyper-susceptibility.
the main distinguishing feature of photon echo methods from all other third-order
processes is the time ordering of the field interactions that leads to a rephasing
process in the induced polarization to remove inhomogeneous contributions to the absorption
linewidth.; term applied to a group of non-linear optical techniques such as integrated echo,
time-gated echo, three-pulse echo peak shift, heterodyne-detected echo and 2d-echo.;
Origin ID : PT07458;
See also
Time-resolved optical spectroscopy in which the inhomogeneous broadening of absorbers
is eliminated by the proper choice of geometry in a four-wave mixing experiment.
