长程通道冷原子退出二维磁光阱由拉盖尔-高斯激光束。

Long-distance channeling of cold atoms exiting a 2D magneto-optical trap by a Laguerre-Gaussian laser beam.

出版信息

Opt Lett. 2014 Feb 1;39(3):719-22. doi: 10.1364/OL.39.000719.

DOI:10.1364/OL.39.000719

Abstract

Using a blue-detuned laser, shaped into a nearly Laguerre-Gaussian (LG) donut mode, we channel atoms exiting a two-dimensional magneto-optical trap (2D-MOT) over a 30 cm distance. Compared to a freely propagating beam, the atomic flux (∼10(10) at/s) is conserved whereas the divergence is reduced from 40 to 3 mrad. So, 30 cm far the 2D-MOT exit, the atomic beam has a 1 mm diameter and the atomic density is increased by a factor of ∼200. The LG-channeled-2D-MOT has been studied versus the order of the LG mode (from 2 to 10) and versus the laser-atom frequency detuning (from 2 to 120 GHz).

摘要

使用蓝失谐激光，将其成形为近乎拉盖尔-高斯（LG）环形光束模式，我们将从二维磁光阱（2D-MOT）中出来的原子引导通过 30 厘米的距离。与自由传播的光束相比，原子通量（约 10（10）个/秒）得以保持，而发散度从 40 减少到 3 毫弧度。因此，在 2D-MOT 出口 30 厘米处，原子束的直径为 1 毫米，原子密度增加了约 200 倍。LG 通道式 2D-MOT 已经针对 LG 模式的阶数（从 2 到 10）和激光-原子频率失谐（从 2 到 120 GHz）进行了研究。