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FIZIKA A 15 (2006) 4 , 227-236
 
STUDY OF VELOCITY-DEPENDENT COLLISION EFFECTS ON LAMB DIP AND CROSSOVER
RESONANCES IN THREE-LEVEL SYSTEM
BIBHAS K. DUTTAa and PRASANTA K. MAHAPATRAb
aDepartment of Physics, J. K. College, Purulia - 723 101, India
bDepartment of Physics and Technophysics, Vidyasagar University,
Midnapore - 721 102, India
Received 20 September 2005; Accepted 13 December 2006
Online 23 February 2007
We discuss the effects of phase-dephasing and velocity-changing collisions on
saturated absorption line shapes studied in an open V-type system under the semi-classical
density-matrix formalism. It has been noted that the traces of Lamb dips and
crossover resonance dip lying within the Doppler-broadened contour can vanish in
the presence of a strong saturating field if a sufficient contribution of
collisional dephasing effect is present. Asymmetry may be introduced in the
wings of saturated line profiles for a small contribution of collision kernel.
PACS numbers: 32.70.Jz, 33.70.-w, 33.70.Jg
UDC 539.186
Keywords: three level systems, saturation spectroscopy, Lamb dip and crossover
resonances, phase-dephasing and velocity-changing collisions
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