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Broadband Vibrational Cooling of Cold Cesium Molecules: Theory and Experiments
D. Sofikitis,A. Fioretti *,S. Weber,M. Viteau,A. Chotia,R. Horchani,M. Allegrini,B. Chatel,D. Comparat,P. Pillet *
1.Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, Bat. 505, 91405 Orsay, France;2.Laboratoire Collisions, Agrégats, Réactivité (UMR 5589, CNRS-UniversitéPaul Sabatier Toulouse 3),IRSAMC, Toulouse, France;3.Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, Bat.505, 91405 Orsay, France,CNISM, Dipartimento di Fisica, Universitμa di Pisa, Largo Pontecorvo, 356127 PISA, Italy
Abstract:
The use of a broadband, frequency shaped femtosecond laser on translationally cold cesium molecules has recently demonstrated to be a very efficient method of cooling also the vibrational degree of freedom. A sample of cold molecules, initially distributed over several vibrational levels, has thus been transfered into a single selected vibrational level of the singlet X1∑g ground electronic state. Our method is based on repeated optical pumping by laser light with a spectrum broad enough to excite all populated vibrational levels but limited in its frequency bandwidth with a spatial light modulator. In such a way we are able to eliminate transitions from the selected level, in which molecules accumulate. In this paper we briefly report the main experimental results and then address, in a detailed way by computer simulations, the perspectives for a “complete”cooling of the molecules, including also the rotational degree of freedom. Since the pumping process strongly depends on the relative shape of the ground and excited potential curves, ro-vibrational cooling through di?erent excited states is theoretically compared.
Key words:  Cold molecule, Optical pumping, Pulse shaping, Ultrashort pulse, Laser cooling
FundProject:
Broadband Vibrational Cooling of Cold Cesium Molecules: Theory and Experiments
D. Sofikitis1, A. Fioretti *1, S. Weber2,3, M. Viteau1, A. Chotia1, R. Horchani1, M. Allegrini1,4, B. Chatel2,3, D. Comparata1, P. Pillet *1
1.CNRS,巴黎第十一大学,奥赛505,91405;2.CNRS,UMR 5589;3.图卢兹三大(保罗?萨巴蒂埃大学) IRSAMC,图卢兹;4.比萨大学物理系,比萨356127
摘要:
通过调制的宽带激光脉冲冷却冷的铯分子平动近来被证明同时也是冷却其振动自由度的有效方法. 这样,最初分布在几个振动能级上的冷分子样品的布居可以被转移到被唯一选定的单电子基态X1∑g的振动能级上. 基于使用具有足够宽谱带的激光脉冲对所有已布居的振动态进行重复泵浦,并且使用空间光调制器来限制其频率带宽,这样就可以消除从所选定的能级上产生的激发,从而使分子布居在这个能级上. 本文报道了实验的主要结果,并且通过仔细的计算模拟来讨论包括转动自由度在内的对分子进行“完全”冷却的前景. 由于泵浦过程强烈地依赖于基态和激发
关键词:  冷铯分子,泵浦,脉冲整形,超短脉冲,激光冷却
DOI:10.1088/1674-0068/22/02/149-156
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