Decelerating a pulsed subsonic molecular beam by a quasi-cw optical lattice: 3D Monte-Carlo simulations

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• 作者：Xiang Ji ; Yaling Yin ; Qi Zhou ; Zhenxia Wang ; Jianping Yin ; ^{jpyin@phy.ecnu.edu.cn}
• 关键词：Atomic and molecular physics ; Laser cooling ; Laser trapping ; Stark effect ; Cavity enhancement
• 刊名：Optics Communications
• 出版年：2013
• 出版时间：15 January, 2013
• 年：2013
• 卷：287
• 期：Complete
• 页码：128-136
• 全文大小：1377 K

文摘

We propose a practical scheme to realize the deceleration of a pulsed subsonic molecular beam by using a multistage optical Stark decelerator (i.e., a 1D quasi-cw, cavity-enhanced optical lattice), which is composed of two nearly counter-propagating, time-varying, red-detuned, light fields with an intensity of ¡«10⁸ W cm^?2 in a folded ring resonator. The dependences of the molecular slowing effects on the synchronous phase angle, the deceleration-stage number and the initial central velocity of incident molecular beam as well as the cavity enhancement factor and its cavity length are investigated by the 3D Monte-Carlo method. Our study shows that the proposed decelerator cannot only be used to slow a pulsed subsonic beam from 240 m/s to standstill, but also to obtain a ultracold molecular packet with a temperature of a few ¦ÌK due to the bunching effect of our multistage optical Stark decelerator, and the corresponding fraction of cold molecules is 10^?4-10^?6, which strongly depends on the synchronous phase angle, the cavity enhancement factor and the initial central velocity of incident molecular beam, etc..