Abstract

Nonlinear polarization spectroscopy in the Frequency Domain (NLPF) is a four wave mixing technique, which not only allows to determine dephasing and energy relaxation rates for molecular and supermolecular systems time on a time scale down to some tens offs, but also gives detailed information about the spectral substructure. It is based on a dichroism which is induced by a linearly polarized pump laser and probed by a second laser linearly polarized under an angle of 45°. The NLPF-signal is measured in direction of the probe beam behind an analyzer perpendicular to the probe field. Its dependence on pump and probe frequency can be well described theoretically in the frame of χ⁽³⁾-approach [1].

© 1998 IEEE