第20卷
第10期
2012年10月
1004-924X(2012)10-2132-08
文章编号
光学精密工程
Optics and Precision Engineering
相干和多模热光场的光子统计实验
张合勇1,2*，赵帅"，郭劲"，王挺峰"，刘海波
（1.中国科学院长春光学精密机械与物理研究所，吉林长春130033：
2.中国科学院大学，北京100039）
No.10
Vol.20
Oet.2012
摘要：以激光外差操测中两束光的特性为基础，分析了相干光场和多模热光场的光子统计模型。分别讨论了上述两种光场的二阶和三阶统计特征，其中二阶统计对应于Fano因子，三阶统计对应于对称固子。对上述两种光场的Fano因子和对称因子进行了实验测量。结果显示，相干光场的Fano因子和对称因子不随入射光子数而变化。将理论模型和实验数据相结合可得到与之对应的串扰概率为0.0321，探测器增益系数为1.0460ph。多模热光场的Fano因子随着人射光子数增加呈直线上升趋势；目标运动速度加快，Fano因子逐渐减小，表示回波光子波动减小，认为其本质原因是热模个数增加引起的平均效应；而多模热光场的对称因子呈抛物线趋势逐渐增加。对相干和多模热光场统计特性的研究，为光子计数体制激光外差探测莫定了基础。
关
键
调：相干光场；多模热光场；光子统计；Fano因子；对称因于；串扰概率，增益系数
中图分类号：O431.2：TN249
文献标识码：A
doi:10.3788/OPE.20122010.2132
Experiment of coherent and
multi-modethermallightstatistics
ZHANG He-yong'-2·, ZHAO Shuai', GUO Jin', WANG Ting-feng',LIU Hai-bo
(l.Changchun Institute of Optics,FineMechanics and Physics,
ChineseAcademyofSciences，Changchun130033，China;
2.University of Chinese Academy of Sciences,Beijing 100039,China)
*Correspondingauthor,E-mail:yonghezhang1116@126.com
Abstract: On the basis of the properties of two beams in heterodyne detection, the photon statistical models for the coherent light and multi-mode thermal light fields were analyzed. The second and third order statistical characters of the two kinds of optical fields were discussed, in which the second order statistics was corresponding to the Fano factor, while the third order one was to the symmetry param-eter. The Fano factor and the symmetry parameter for the two kinds of light fields were measured ex-perimentally. The results indicate that Fano factor and symmetry parameter do not change with the variance of incident photons for the coherent light field. Combined with the theoretical model and ex-perimental data, it shows that the cross-talk probability is 0. 032 1 and the gain coefficient is 1. 0460 ph. However, the Fano factor of multi-mode thermal light field increases with the incident photons
收稿日期：2012-05-25；修订日期：2012-07-15
基金项目：中国科学院长春光学精密机械与物理研究所第三期创新工程项目（No.O98Y32C100）