论文标题
通过站立浅脉冲序列来表征原子的超鼻涕动量
Characterizing ultra-narrow momentum of atoms by standing-wave light-pulse sequences
论文作者
论文摘要
我们提出了一种通过使用站立的轻脉冲序列束束来表征原子气体超鼻涕动量分布的方法。详细分析了光束分裂的机理，并给出了有限宽度动量分布对每个衍射顺序种群的影响。可以通过测量双掌轻脉冲后不同衍射顺序中的种群比率来校准超电原子气体的温度。我们获得了两种典型情况的分析表达式，并通过使用Wigner函数在整个过程中展示了相位空间的演变。该方法对于经典的原子气和玻色的凝结物均有效，并且适用于在空间超冷原子物理平台上的温度测量，其中原子气的超鼻row动量分布在100pk甚至较低。
We propose a method to characterize the ultra-narrow momentum distribution of atomic gases by employing a standing-wave light-pulse sequences beam-splitter. The mechanism of beam splitting is analyzed in detail, and the influence of a finite-width momentum distribution on the population of each diffraction order is given. The temperature of ultracold atomic gases can be calibrated by measuring the ratio of population in different diffraction orders after double standing-wave light-pulses. We obtain analytical expressions for two typical cases, and demonstrate phase space evolution in the whole process by using the Wigner function. This method is valid for both classical atomic gas and Bose-Einstein condensates, and it is suited for temperature measurement on the space ultra-cold atomic physics platform, in which the ultra-narrow momentum distribution of atomic gas is on the order of 100pK or even lower.
