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激光冷却原子技术已在精密测量领域获得广泛应用,偏振梯度冷却技术是获得超冷原子的常用方法。偏振梯度冷却需要大范围减小冷却光频率,传统方案是用声光移频器的衍射光作为冷却光,通过改变声光移频器的移频量改变冷却光频率,但声光晶体移频带宽较窄,该方法冷却光频率移动不能充分进行,这严重限制了原子冷却的效果。介绍了一种可大范围改变冷却光频率的方法,该方法通过改变激光器输出频率来实现冷却光频率的改变,频率调谐范围可达120MHz。该方法可获得更低温度和更多数目的原子源,满足高精度冷原子物质波干涉测量的需求。
Laser cooling atomic technology has been widely used in the field of precision measurement. Polarization gradient cooling is a common method to obtain ultra-cold atoms. Polarization gradient cooling needs to reduce the cooling light frequency in a wide range. The traditional solution is to use the diffracted light of the acousto-optic frequency shifter as the cooling light and change the cooling light frequency by changing the frequency shift of the acousto-optical frequency shifter. However, Narrow bandwidth, the method of cooling light frequency shift can not be fully carried out, which severely limits the cooling effect of the atom. A method of changing the cooling light frequency is introduced. The method changes the cooling light frequency by changing the laser output frequency, and the frequency tuning range is up to 120MHz. The method can obtain lower temperature and a greater number of atomic sources to meet the requirements of high-precision measurement of cold atomic material wave interference.