On the role of coupling in mode selective excitation using ultrafast pulse shaping in stimulated Raman spectroscopy.
The coherence of two coupled two-level systems, representing vibrational modes in a semiclassical model, is calculated in weak and strong fields for various coupling schemes and for different relative phases between initial state amplitudes. A relative phase equal to pi projects the system into a dark state. The selective excitation of one of the two, two-level systems is studied as a function of coupling strength and initial phases.
Malinovskaya
S A
SA
Michigan Center for Theoretical Physics, FOCUS Center, and Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA.
Bucksbaum
P H
PH
Berman
P R
PR