光学参量振荡器衍射损耗对输出场的影响  

Effect of Diffraction Loss of Optical Parametric Oscillator on Its Output Field

作　　者：王东[1] 黄仙山[1] 

机构地区：[1]安徽工业大学数理学院,安徽马鞍山243002

出　　处：《安徽工业大学学报（自然科学版）》2012年第3期237-241,共5页Journal of Anhui University of Technology（Natural Science）

基　　金：安徽省教育厅自然科学基金项目(KJ2012Z023;KJ2010A335)

摘　　要：损耗对量子态的压缩和纠缠特性有重要影响。当光学参量振荡器微型化时,衍射损耗可能会降低光场的压缩度。针对菲涅尔数较小的平凹谐振腔,将菲涅尔—基尔霍夫衍射积分方程变量分离,利用Fox-Li数值迭代法分析平凹腔的镜面场分布和损耗特性。结果表明迭代法得到的自再现模不同于ABCD矩阵法得到的高斯模,但是二者相差不大;当镜片尺寸继续减小时,会使得镜面不再是等相位面,镜面上的位相呈高斯分布,因此会影响光学参量振荡器输出场的压缩度和关联度。Loss has important impact on properties of squeezing and entanglement of quantum state.In the miniaturization of optical parametric oscillator,diffraction loss may be the main reason of reducing the squeezing degree.For a plano-concave resonator with small Fresnel number,the field distribution and loss are calculated by separating the variables of Fresnel-Kirchhoff integral equation with numerical iteration method.Results show that the normal mode obtained with the iterative method differs from that of the Gaussian mode obtained from ABCD matrix,but there is small difference.Decreasing the size of the len,the mirror is no longer the equiphase surface,and the phase on the mirror presents as Gaussian distribution,that affects the squeezing and correlation degree of the output field of the optical parametric oscillator.

关 键 词：衍射 模式 压缩 损耗 量子态 

分 类 号：O439[机械工程—光学工程]