Super-Resolution of Interference Pattern with Independent Laser Beams

We propose a scheme to achieve super-resolution of interference pattern with independent laser beams. We perform an experimental observation of a double-slit interference with two orthogonally polarized laser beams. The resolution of the interference pattern measured by a two-photon detection is doubled provided the two beams illuminate the double-slit with certain incident angles. The scheme is simple and can favour both high intensity and perfect visibility.     

光学图像的无噪声放大

光图像的参量放大的高速摄影,医学和天文观测设备等方面有重要的应用价值.     

双光子连续频率变量纠缠熵

介绍了连续频率变量系统中纠缠熵的计算方法。根据这种方法我们计算了自发参量下转换产生的具有高斯型频谱形式的双光子态的纠缠熵,证实了纠缠熵的大小和泵浦光带宽(σp)与下转换光带宽(σ)之比有关的直观分析.     

Third-order ghost interference with thermal light

A scheme for third-order ghost interference with thermal light is proposed. The visibility and resolution of the interference fringe related to the bandwidth of the spatial frequency spectrum of the source are analysed. The results show that the visibility of the third-order ghost interference fringe is much higher than that of the second-order one.     

Continuous-wave Nd:KGd(WO4)2 single-longitudinal-mode laser

A continuous-wave Nd:KGd(WO₄)₂ single-longitudinal-mode laser is demonstrated with Fabry-Perot etalons in a simple linear cavity. The thermal lens effect is dramatically lowered by propagating the laser beam along the ‘athermal’ direction inside the laser crystal, which is very beneficial to removing the heat generated in the mode selection process. The maximum single-longitudinal-mode output power obtained is 64.8 mW at incident pump power of 4.7 W, corresponding to an optical conversion efficiency of 1.3% and a slope efficiency of 1.7%.     

高增益自发参量下转换光的关联成像

本文研究了高增益自发参量下转换光的关联成像。在高增益自发参量下转换光束中，既存在信号光和闲置光之间的量子纠缠关联，每束光自身还满足热光统计性质，具有经典热光关联。因此可以利用高增益自发参量下转换过程同时产生两种关联成像方式：纠缠双光子关联成像和热光关联成像。本文比较了纠缠双光子关联成像和热光关联成像的异同，并详细讨论了各种成像条件下高增益自发参量光源的关联成像。     

在双Λ结构原子介质中信号光的存储和放大

我们分析了与两个控制场和两个信号场相互作用的双Λ结构四能级原子系统.从我们给出的数值模拟图可以看出,通过绝热地改变控制场,两个不同频率的同步探测场可以同时被存储和释放.我们发现,运用这一模型可以使其中一个探测场实现存储放大.此外我们还讨论了信号光存储放大的机理和条件.     

关联光学新进展

文章综述了利用光学自发参量下转换过程产生的纠缠双光子态和热光源的空间关联性,实现"鬼"成像、"鬼"干涉、亚波长干涉和非定域双缝干涉等实验的研究进展,以及其中涉及的争论问题.