1 中国科学院上海光学精密机械研究所航天激光工程部，上海 201800
2 中国科学院大学材料科学与光电子技术学院，北京 100049
3 电子科技大学电子科学与工程学院，四川 成都 611731
4 中国科学院上海光学精密机械研究所量子光学重点实验室，上海 201800
射频蒸发冷却作为获取超冷原子简并量子气体的手段之一，对玻色-费米协同冷却的实现至关重要。为了在空间站上实现超冷量子简并气体，设计了一种特殊的射频天线。该天线被置于一个冷原子实验用真空腔内，与腔上集成的冷却、探测、光阱、磁阱、光晶格、Feshbach磁场等装置一同组成了通用型超冷原子物理实验系统，该实验系统满足载人航天工程在尺寸、重量、功耗、可靠性和电磁兼容性等方面的严格要求。利用有限元仿真方法对天线进行设计和评估，并在地面实验平台上对其各项性能指标进行测试和实验验证。结果表明，本设计除了能够降低90%的射频功率需求外，还能维持科学腔的超高真空水平，并具备良好的电磁兼容性，符合载人航天工程的要求。
量子光学 玻色-爱因斯坦凝聚体 射频诱导蒸发冷却 微波 Zeeman效应
Author Affiliations
Abstract
1 Key Laboratory for Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, SPTE, South China Normal University, Guangzhou 510006, China
3 School of Mathematics and Physics, Jiangsu University of Science and Technology, Zhenjiang 212003, China
A mixed light field generated from a two-level atomic ensemble can be used for two-photon interference. In this mixed light field, correlated paired photons generated from a four-wave mixing process provide a signal of two-photon interference, while Rayleigh scattered photons of the pump laser provide a stable reference to calibrate the normalized second-order correlation function. We demonstrate two-photon interference using the Hong–Ou–Mandel and Hanbury Brown–Twiss interferometers. A direct quantitative comparison between theoretical predictions and experimental data is performed under perturbed experimental conditions, which reveal this kind of light source has potential application for quantum metrology.
Photonics Research
2020, 8(6): 06000781
Author Affiliations
Abstract
1 Key Laboratory for Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, 999077, China
A Fourier optics approach can be a concise and powerful tool to solve problems in atom optics. In this report, we adopt it to investigate the kinetic behavior of cold atoms passing through a far red-detuned Gaussian beam. We demonstrate that the aberration has significant influence on the evolution of the atomic cloud, which is rooted in the deviation of the Gaussian profile from the quadratic form. In particular, we observe an intriguing effect analogous to Fresnel’s double prism with cold atoms. The experimental results are in good agreement with the numerical simulation.
020.1335 Atom optics 020.3320 Laser cooling 070.7345 Wave propagation Chinese Optics Letters
2016, 14(7): 070202
1 中国科学院上海光学精密机械研究所量子光学重点实验室, 上海 201800
2 中国科学院冷原子物理研究中心, 上海 201800
报道一种用电光晶体实现快速调谐和调制激光频率的方法。在Littrow型外腔反馈半导体激光中插入LiNbO3晶体,利用LiNbO3晶体的电光效应,通过改变晶体电压来调节激光器的有效腔长,可以对激光频率进行快速的调谐和调制。采用该方法,自制外腔反馈半导体激光器的调谐频率可达到2 kHz,它的调谐范围为350 MHz,激光频率调谐系数约为1.06 MHz/V,用饱和吸收光谱观测频率调谐的效果。快速激光频率调制可以应用在稳频技术上,将外腔反馈半导体激光器调制在5～100 kHz频率下,均获得了87Rb原子D2线的饱和吸收光谱的色散信号,并实现了激光频率在饱和吸收峰上的长期稳定。
激光器 外腔反馈半导体激光器 电光调制 激光稳频技术
Author Affiliations
Abstract
Laboratory for Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Center for Cold Atom Physics, Chinese Academy of Sciences, Shanghai 201800
A new method of frequency-shifting for a diode laser is realized. Using a sample-and-hold circuit, the error signal can be held by the circuit during frequency shifting. It can avoid the restraint of locking or even lock-losing caused by the servo circuit when we input a step-up voltage into piezoelectric transition (PZT) to achieve laser frequency-shifting.
000.2170 equipment and techniques 140.0140 lasers and laser optics 300.6260 spectroscopy diode lasers Chinese Optics Letters
2005, 3(9): 09524
