Interaction of a sequence of frequency-chirped bichromatic laser pulses with an ensemble of Lambda-atoms: Population trapping and coherent optical pumping
G. Djotyan et al., Interaction of a sequence of frequency-chirped bichromatic laser pulses with an ensemble of Lambda-atoms: Population trapping and coherent optical pumping, LASER PHYS, 10(1), 2000, pp. 355-359
We show that population trapping may be achieved in an ensemble of Doppler-
broadened three-level Lambda-atoms when acting by a few frequency-chirped b
ichromatic laser pulses (BLPs) with duration longer than the decay time of
the excited state of the atoms. The action of successive sequence of short
frequency-chirped laser pulses on such a prepared atomic ensemble results i
n coherent optical pumping of atoms into a single ground state. A reversibl
e population transfer between two ground states of the atoms through an int
ermediate specific distribution of populations between the atomic states is
shown to be produced by a sequence of frequency-chirped short BLPs.