Light absorption by interacting atomic gas in quantum optical regime
Document Type
Article
Publication Date
7-28-2021
Abstract
Quantum optical theory of absorption properties of interacting atoms is developed. The concept of local absorptance is introduced as a derivative of the logarithm of intensity with respect to the distance in the vicinity of a given spatial point and a moment of time. The intensity is represented by the quantum and statistically averaged normal product of creation and annihilation operators of the electromagnetic field. The development of an analytical method of the estimation for the kinetic and optical parameters for the system is proposed here. The calculation method of the absorption coefficient includes thermal atomic motion, Doppler effect, and the short-range interaction between atoms. The absorption coefficient explicitly takes into account the quantum nature of the optical field. The ability of the system to absorb or emit quanta is quantitatively expressed through the special form of interaction integrals. The specific form of integrals results from the structure of the quantum brackets. The interplay between the collective (virtual photon exchange) and binary (optically induced inter-particle bonding) processes determines the system behavior. The spectral profile of the local absorption coefficient for different atomic densities and time intervals is simulated for realistic parameters.
Keywords
Light absorption, Interacting atomic gas, Quantum optical regime
Divisions
PHYSICS
Publication Title
The Journal of Chemical Physics
Volume
155
Issue
4
Publisher
American Institute of Physics
Publisher Location
1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA