Multistage optical Stark decelerator for a pulsed supersonic beam with a quasi-cw optical lattice.
Multistage optical Stark decelerator for a pulsed supersonic beam with a quasi-cw optical lattice.
复制标题
DOI：
10.1364/oe.17.010706
复制
发表时间：
2009-06
期刊：
影响因子：
3.8
通讯作者：
Yaling Yin;Qi Zhou;L. Deng;Yong Xia;J. Yin
中科院分区：
文献类型：
--
作者：
Yaling Yin;Qi Zhou;L. Deng;Yong Xia;J. Yin
提出了一种新的方案，利用长度为10 mm的时变红失谐准连续光晶格实现了超声速分子束的多级光学斯塔克减速.分析了减速分子在光学减速器中的运动，研究了减速分子包的速度与同步相位角和减速级数（即，减速级数）的关系，并对减速分子包的速度与减速级数的关系进行了讨论.光学晶格单元的数目）。研究表明，该光学斯塔克减速器不仅能有效地将脉冲超声束从230 m/s减速到零（静止），而且由于多级光学斯塔克减速器中的聚束效应，可以获得温度低于mK的超冷分子包，通过快速关闭晶格的调制信号，可以将其捕获在光学晶格中。同时，将多级光学斯塔克减速器的减速结果与单级光学斯塔克减速器的减速结果进行了比较，发现在相同的分子束参数和减速条件下，我们的方案不仅可以获得更冷的分子包，而且可以直接用于减速后的冷分子的捕获，而不需要使用另一个分子阱。
We propose a new scheme to realize a multistage optical Stark deceleration for a supersonic molecular beam using a time-varying red-detuned quasi-cw optical lattice with a length of up to 10 mm. We analyze the motion of the slowed molecules inside the optical decelerator, and study the dependences of the velocity of the slowed molecular packet on the synchronous phase angle and the number of the deceleration stages (i.e., the number of the optical-lattice cells) by using Monte-Carlo method. Our study shows that the proposed optical Stark decelerator cannot only efficiently slow a pulsed supersonic beam from 230 m/s to zero (standstill), but also obtain an ultracold molecular packet with a temperature of sub-mK due to bunching effect in the multistage optical Stark decelerator, which can be trapped in the optical lattice by rapidly turning off the modulation signal of the lattice. Also, we compare the decelerated results of our multistage optical Stark decelerator with a single-stage optical one, and find that our scheme cannot only obtain a colder molecular packet under the same molecular-beam parameters and deceleration conditions, but also be directly used to trap the slowed cold molecules after the deceleration, while don't need to use another molecular trap.