用于冷原子研究的小型集成化法拉第磁光隔离器

J4 ›› 2014, Vol. 31 ›› Issue (5): 547-553.

用于冷原子研究的小型集成化法拉第磁光隔离器

张龙毅李诗哲李辰林斌杨仕锋马兆远陈徐宗齐向晖

1北京大学信息科学技术学院，北京 100871； 2中国科学院上海光学精密机械研究所，上海 201800

收稿日期:2013-05-02 修回日期:2013-07-03 出版日期:2014-09-28 发布日期:2014-09-17
通讯作者: 陈徐宗（1958—）江苏苏州人，教授，博士生导师，主要从事冷原子物理、精密测量和原子钟方面的研究。 E-mail:xuzongchen@pku.edu.cn

Small and Integrated Faraday Optical Isolator for Cold Atom Research

ZHANG Long-yi, LI Shi-zhe, LI Chen, LIN Bin, YANG Shi-feng, MA Zhao-yuan, CHEN Xu-zong，QI Xiang-hui

1 Institute of Quantum Electronics, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China； 2 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

Received:2013-05-02 Revised:2013-07-03 Published:2014-09-28 Online:2014-09-17

摘要/Abstract

摘要： 研制了一种高均匀性、小型化的法拉第磁光隔离器，用于780nm波长的光路中，并对设计方案进行了数值模拟和验证。采用了新颖的三段式“π”形磁体的组合设计方案，提高了剩磁利用率。隔离器整体体积为52cm3，其中磁体体积为18cm3，是相当小的。它的通光孔径为5mm，隔离比为34.6dB，透过率为90.9%。与之类似的“II”型磁体体积更小，磁场均匀性稍差，也是可行的设计方案。成品隔离器比商用隔离器磁场均匀度更高，体积更小，隔离比更高，可以有效满足研发中的冷原子平台的小型化、高精度需求。

关键词: 激光器件；法拉第磁光隔离器；数值模拟；玻色爱因斯坦凝聚；冷原子

Abstract: An improved design of Faraday Optical Isolator at 780nm is developed. Numerical simulation is used to confirm the design. It has advantage of more uniform magnetic field, smaller size and better isolation. This design of magnet called style “π” divides a whole hollow cylinder into 3 parts including several fan-shaped magnets. It can increase the use ratio of the remanence of magnet. The design of one-stage isolator has a volume of 52cm3 with a volume of magnet of 18cm3, which is small. The optical clear aperture is 5mm with a 34.6-dB isolation and 90.9% transmission rate. Style “II” may also be optional for having a smaller volume but less uniformed magnets. The isolator developed according to style “π” has better performance than common used optical isolators in terms of atomic, molecular and optics (AMO) physics at the special wavelength of 780nm in order to meet the demands of the ultracold atom system.

Key words: Laser devices; Faraday optical isolator; Numerical simulation; Bose-Einstein condensation; Cold atom

中图分类号:

TN249

张龙毅李诗哲李辰林斌杨仕锋马兆远陈徐宗齐向晖. 用于冷原子研究的小型集成化法拉第磁光隔离器[J]. J4, 2014, 31(5): 547-553.

ZHANG Long-yi, LI Shi-zhe, LI Chen, LIN Bin, YANG Shi-feng, MA Zhao-yuan, CHEN Xu-zong，QI Xiang-hui. Small and Integrated Faraday Optical Isolator for Cold Atom Research[J]. J4, 2014, 31(5): 547-553.

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