对应于铯原子D_1线正交压缩真空态光场的制备  

Generation of Quadrature Squeezed Vacuum Light Field for Cesium D_1 Line

作　　者：张岩[1,2] 刘晋宏[1,2] 马荣[1,2] 王丹[1,2] 韩宇宏[1,2] 张俊香[1,2] 

机构地区：[1]山西大学光电研究所量子光学与光量子器件国家重点实验室,山西太原030006 [2]山西大学极端光学协同创新中心,山西太原030006

出　　处：《光学学报》2017年第5期250-255,共6页Acta Optica Sinica

基　　金：国家自然科学基金(11574188);国家自然科学基金重点项目(11634008);高等学校博士学科点专项科研基金博导类课题(20131401110013);国家自然科学基金创新研究群体科学基金(61121064)

摘　　要：对应于碱金属原子吸收线的非经典光是量子信息网络中重要光源之一,近年来受到人们的广泛关注。而对应于铯原子D_1线的非经典光场由于其独特的波长在固态量子信息网络中有重要应用前景。采用连续单频钛宝石激光器作为光源,将输出的锁定于铯原子D_1线的894.6nm激光通过外腔倍频产生447.3nm蓝光,再用于抽运由周期极化磷酸氧钛钾(PPKTP)晶体作为非线性介质的连续简并光学参量振荡器,获得铯原子D_1线的单模正交压缩真空光。光学参量振荡器阈值为39mW,在注入抽运光功率为30mW时,利用平衡零拍探测装置测得2.8dB正交压缩度。考虑到探测效率,光学参量振荡器输出光场的实际压缩度为4.4dB。The non-classical light at alkali atomic absorption lines is one of the important resources for quantum information networks, and it gets more attentions recently. Because of the unique wavelength of the non-classical light field at cesium D1 line, it has important application prospect in the field of solid-state quantum information networks. Continuous wave single frequency Ti： sapphire laser is used as light source. The 447.3 nm blue laser is generated by the output 894.6 nm laser locked at cesium Dj line via frequency doubling of external cavity. The blue laser is used to pump continue wavelength degeneration optical parametric oscillator, and the nonlinear medium of the oscillator is periodically poled KTP （PPKTP） crystal. Then the simple module quadrature squeezed vacuum light at cesium D~ line is obtained. The threshold of the optical parametric oscillator is 39 mW. When the pump power is 30 roW, quadrature squeezing degree measured by balanced homodyne detector is 2.8 dB. Taking account of detection efficiency, the actual squeezing degree of the output light field of optical parametric oscillator reaches 4.4 dB.

关 键 词：非线性光学 光学参量振荡器 正交压缩真空态 平衡零拍探测 铯原子D1线 

分 类 号：O437.4[机械工程—光学工程]