用于测量冷原子温度的时序脉冲发生器的设计

近年来人们在激光冷却和捕获原子方面取得了辉煌的成就.对捕获的冷原子团温度、密度的精确测量也成为一个重要的研究课题.在冷原子温度测量中需要在较短时间内(最长不超过几个毫秒)迅速关断俘获冷原子的磁光阱(包括磁场和光场).作者针对时间飞行法测量冷原子温度对光场和磁场的关断要求,设计并制作了一种简单、实用的可调脉冲延时和脉宽的脉冲发生器,应用其产生的脉冲在较短时间内有效地关断磁场和光场,达到冷原子温度测量的要求.

Design of a pulse generator used in the measurement of the temperature of ultra-cold atoms

Over the past decade there have been a lot of remarkable progress in cooling,trapping and manipulating atoms.The precise measurement of temperature and density of ultra-cold atoms becomes an important subject.In the measurement of the temperature of cold atoms,one needs to turn off the magnetic field and the light field in a very short time(less than several milliseconds).According to the requirements of the time-flying method in measuring the cold-atom temperature,one can design and make a pulse generator whose pulse-width and delay time are controllable.Then the pulses are applied to the switches of magneto-optical trap,and the magnetic and light field can be turned off in short time successfully.