光学学报, 2017, 37 (5): 0519001, 网络出版: 2017-05-05
对应于铯原子D1线正交压缩真空态光场的制备 下载: 512次
Generation of Quadrature Squeezed Vacuum Light Field for Cesium D1 Line
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 nonlinear optics optical parametric oscillator quadrature squeezed vacuum state balanced homodyne detection cesium D1 line
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D1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D1线的894.6 nm激光通过外腔倍频产生447.3 nm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D1线的单模正交压缩真空光。光学参量振荡器阈值为39 mW, 在注入抽运光功率为30 mW时, 利用平衡零拍探测装置测得2.8 dB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4.4 dB。
Abstract
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 D1 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 D1 line is obtained. The threshold of the optical parametric oscillator is 39 mW. When the pump power is 30 mW, 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.
张岩, 刘晋宏, 马荣, 王丹, 韩宇宏, 张俊香. 对应于铯原子D1线正交压缩真空态光场的制备[J]. 光学学报, 2017, 37(5): 0519001. Zhang Yan, Liu Jinhong, Ma Rong, Wang Dan, Han Yuhong, Zhang Junxiang. Generation of Quadrature Squeezed Vacuum Light Field for Cesium D1 Line[J]. Acta Optica Sinica, 2017, 37(5): 0519001.