Realization of double resonance for a bright frequencytunable source of narrowband entangled photons

作     者：杨剑 赵天明 张涵 杨涛 包小辉 潘建伟 

作者机构：Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern PhysicsUniversity of Science and Technology of China Physikalisches Institut der Universitaet Heidelberg 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2011年第20卷第2期

页      面：235-238页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：supported by the Science Foundation of the Chinese Academy of Sciences the National Fundamental Research Program of China (Grant No. 2011CB921300) the National Natural Science Foundation of China 

主　　题：optics alignment double-resonance cavity-enhanced narrowband entanglement 

摘      要：In this paper, we report an interesting phenomenon when precisely adjust the tuning crystal for double-resonance of a type-II configured parametric amplifier cavity, which is later verified as a cavity-enhanced effect in optics alignment. The theoretical result indicates that an angle accuracy error within 0.09° is necessary to achieve a high contrast ratio of 100：1 for a cavity with a finesse of about 205, which is crucial but high-demanding to get a high-quality narrowband entanglement source. Meanwhile, we figure out a method to release such a high requirement and get high visibility in a moderate-accuracy alignment.