Author Affiliations
Abstract
1 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
2 Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
A frequency-stabilized 556-nm laser is an essential tool for experimental studies associated with 1S0-3P1 intercombination transition of ytterbium (Yb) atoms. A 556-nm laser light using a single-pass second harmonic generation (SHG) is obtained in a periodically poled MgO:LiNbO3 (PPLN) crystal pumped by a fiber laser at 1111.6 nm. A robust frequency stabilization method which facilitates the control of laser frequency with an accuracy better than the natural linewidth (187 kHz) of the intercombination line is developed. The short-term frequency jitter is reduced to less than 100 kHz by locking the laser to a home-made reference cavity. A slow frequency drift is sensed by the 556-nm fluorescence signal of an Yb atomic beam excited by one probe beam and is reduced to less than 50-kHz by a computer-controlled servo system. The laser can be stably locked for more than 5 h. This frequency stabilization method can be extended to other alkaline-earth-like atoms with similar weak intercombination lines.
镱原子 激光稳频 互组跃迁 类碱土金属原子 140.3425 Laser stabilization 140.3515 Lasers, frequency doubled 300.6400 Spectroscopy, molecular beam 140.7010 Laser trapping Chinese Optics Letters
2011, 9(4): 041406
Author Affiliations
Abstract
1 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
2 Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
We build a Zeeman slower with consecutive coils and use it to load an Yb magneto-optical trap (MOTs). Cooling efficiency is measured by the fluorescence intensity of the atomic cloud trapped by the MOT. An optimized magnetic field profile can acquire the maximum cooling efficiency, corresponding to a good compromise between the smaller magnetic field mismatch and the high capture velocity. Our studies provide useful information on how the performance of the Zeeman slower can be improved.
塞曼减速器 原子冷却 磁光阱 镱原子 020.3320 Laser cooling 020.7010 Laser trapping 020.7490 Zeeman effect Chinese Optics Letters
2011, 9(1): 010201
中国科学院上海精密机械研究所量子光学(联合)开放实验室, 上海 201800
报道钕玻璃微球腔在尺寸发生微小变化时腔模也随之移动;腔模移动对泵浦耦合产生了重大影响.
微球腔 腔内QED效应 尺寸参数
中国科学院上海光学精密机械研究所量子光学(联合)开放实验室, 上海 201800
报道腔内量子电动力学效应对钕玻璃微球荧光谱的影响;分析了光谱中量子电动力学结构的相对强度,同时估算了自发辐射速率的量子电动力学增强.实验证实增强辐度超过16倍.
腔内量子电动力学效应 腔模 尺寸参数
中国科学院上海光机所量子光学(联合)开放实验室, 上海 201800
本文在理论上模拟了钕玻璃微球在810 nm波长附近的共振光谱,并通过与实验结果的比较识别和分析了出现的模式。发现序数为15、16的模式在光谱中占主导地位。
微球腔 尺寸参数 腔内QED效应