Laser cooling of molecules via single spontaneous emission
Document Type
Article
Publication Date
1-1-2003
Abstract
A general scheme for reducing the center-of-mass entropy is proposed. It is based on the. repetition of a cycle, composed of three concepts: velocity selection, deceleration and irreversible accumulation. Well-known laser techniques are used to represent these concepts: Raman pi-pulse for velocity selection, STIRAP for deceleration, and a single spontaneous emission for irreversible accumulation. No closed pumping cycle nor repeated spontaneous emissions are required, so the scheme is applicable to cool a molecular gas. The quantum dynamics are analytically modelled using the density matrix. It is shown that during the coherent processes the gas is translationally cooled. The internal states serve as an entropy sink, in addition to spontaneous emission. This scheme provides new possibilities to translationally laser-cool molecules for high precision molecular spectroscopy and interferometry.
Keywords
Coherent population transfer, Theoretical-analysis, Photon recoil, Atoms, Excitation, Entropy, States, Pulses
Divisions
PHYSICS
Publication Title
European Physical Journal D
Volume
22
Issue
2
Additional Information
Department of Physics, Faculty of Science Building, University of Malaya, 50603 Kuala Lumpur, MALAYSIA