Decelerating and bunching molecules with pulsed traveling optical lattices (10 pages)
Decelerating and bunching molecules with pulsed traveling optical lattices (10 pages)
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DOI：
10.1103/physreva.69.013409
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发表时间：
2004
影响因子：
2.9
通讯作者：
G. Dong;Weiping Lu;P. Barker
中科院分区：
文献类型：
--
作者：
G. Dong;Weiping Lu;P. Barker
我们研究了冷分子在脉冲超音速射流中的减速和聚束，使用远共振光学晶格以恒定速度行进。通过解析处理，我们发现通过选择晶格速度等于超音速光束速度的一半并优化脉冲持续时间，很大一部分（{约}33%）的平动冷（1 K） CO分子可以从超音速分子束中减速到零速度，并同时在速度空间中聚集。由于缓冲气体与脉冲射流中CO分子的极化质量比差异较大，可以通过选择合适的脉冲持续时间将缓冲气体排除在固定分子的组分中。此外，我们发现光学晶格内的空间束被诱导，并且束在晶格内的位置可以通过改变晶格速度来选择。
We investigate the deceleration and bunching of cold molecules in a pulsed supersonic jet using a far-off-resonant optical lattice traveling with a constant velocity. Using an analytical treatment, we show that by choosing the lattice velocity equal to half the supersonic beam velocity and by optimizing the pulse duration, a significant fraction ({approx}33%) of translationally cold (1 K) CO molecules from a supersonic molecular beam can be decelerated to zero velocity, and simultaneously bunched in velocity space. Due to the large difference of polarizability to mass ratio between the buffer gas and the CO molecules in the pulsed jet, the buffer gas can be precluded from the fraction of stationary molecules by choosing a suitable pulse duration. Furthermore, we find that spatial bunching within the optical lattice is induced and the position of the bunch within the lattice can be chosen by varying the lattice velocity.