Effects of long-lived incoherences on coherent population trapping

Agarwal, G. S. ; Nayak, N. (1986) Effects of long-lived incoherences on coherent population trapping Journal of Physics B: Atomic and Molecular Physics, 19 (20). pp. 3375-3384. ISSN 0022-3700

Full text not available from this repository.

Official URL: http://iopscience.iop.org/0022-3700/19/20/021

Related URL: http://dx.doi.org/10.1088/0022-3700/19/20/021


The effects of the non-Markov character of several types of relaxation on population trapping are examined. Different types of relaxation can arise as a result of (i) intermediate-state interactions and (ii) the non-Lorentzian character of the lineshapes of the pump and probe beams used for the study of the trapping. In each case the dynamical equations for the appropriately defined elements of the density matrix will have multiplicative colour noise, for which the correlation time τc, need not be short. A very interesting regime of physical behavior is obtained if the correlation time and of the Rabi frequencies, Gi, of the transitions are such that Giτ ⋍1. The relevant mathematical equations for the two mechanisms of relaxation, (i) and (ii), are related using methods based on Fokker-Planck equations and matrix continued fractions; the authors calculate physical quantities such as excited-state populations and coherences for a range of parameters including detunings, correlation times and pump and probe intensities. Under conditions of population trapping, Raman signals have the same form as Fano profiles.

Item Type:Article
Source:Copyright of this article belongs to Institute of Physics.
ID Code:90392
Deposited On:10 May 2012 04:05
Last Modified:10 May 2012 04:05

Repository Staff Only: item control page