Simultaneous stochastic effects of a thermal reservoir and an electromagnetic field on the optical susceptibility of a two-level system

In this paper we derive analytical expressions for the optical susceptibility of a two-level system immersed in a thermal bath and interacting with an external electromagnetic field, where both of them are considered as noise sources. The dynamics of the system is described by a set of optical stoch...

Full description

Saved in:
Bibliographic Details
Published in:Journal of molecular structure. Theochem 1997-02, Vol.390 (1), p.33-38
Main Authors: Colmenares, Pedro J., Paz, J.L., Almeida, Rafael, Squitieri, Emilio
Format: Article
Language:English
Subjects:
Bloch equation
Optical susceptibility
Stochastic effect
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this paper we derive analytical expressions for the optical susceptibility of a two-level system immersed in a thermal bath and interacting with an external electromagnetic field, where both of them are considered as noise sources. The dynamics of the system is described by a set of optical stochastic Bloch equations. The noise sources are modeled as Ornstein-Uhlenbeck processes. The optical stochastic Bloch equations are perturbatively solved up to second order in the external field. We found that each noise affects the dynamics in a different manner. Thus, at first order, the bath modifies the transverse relaxation time, whereas the effect of a random field can only be appreciated if the expansion is calculated up to second order, where correlations begin to be important.
ISSN:0166-1280
1872-7999
DOI:10.1016/S0166-1280(96)04756-2