Laser cooling of molecules via single spontaneous emission

Marzlin, K.P. and Audretsch, J. and Ooi, Chong Heng Raymond (2003) Laser cooling of molecules via single spontaneous emission. European Physical Journal D, 22 (2). pp. 259-267. ISSN 1434-6060, DOI

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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.

Item Type: Article
Additional Information: Department of Physics, Faculty of Science Building, University of Malaya, 50603 Kuala Lumpur, MALAYSIA
Uncontrolled Keywords: Coherent population transfer; Theoretical-analysis; Photon recoil; Atoms; Excitation; Entropy; States; Pulses
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Department of Physics
Depositing User: Miss Malisa Diana
Date Deposited: 08 Jul 2013 09:39
Last Modified: 09 Oct 2019 00:46

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