Yuan Jin-Peng, Ji Zhong-Hua, Zhao Yan-Ting, Chang Xue-Fang, Xiao Lian-Tuan, Jia Suo-Tang
Appl Opt. 2013 Sep 1;52(25):6195-200. doi: 10.1364/AO.52.006195.
We present a simple, reliable, and nondestructive method for the measurement of vacuum pressure in a magneto-optical trap. The vacuum pressure is verified to be proportional to the collision rate constant between cold atoms and the background gas with a coefficient k, which can be calculated by means of the simple ideal gas law. The rate constant for loss due to collisions with all background gases can be derived from the total collision loss rate by a series of loading curves of cold atoms under different trapping laser intensities. The presented method is also applicable for other cold atomic systems and meets the miniaturization requirement of commercial applications.
我们提出了一种用于测量磁光阱中真空压力的简单、可靠且无损的方法。经证实，真空压力与冷原子和背景气体之间的碰撞速率常数成正比，比例系数为k，该系数可通过简单的理想气体定律计算得出。与所有背景气体碰撞导致的损失速率常数可根据不同俘获激光强度下冷原子的一系列加载曲线，从总碰撞损失速率推导得出。所提出的方法也适用于其他冷原子系统，并且满足商业应用的小型化要求。
