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中文摘要：
在理论和实验上研究了光学参量振荡中产生的弱压缩真空场的光子统计行为.弱压缩真空具有强烈的光子聚束效应,这种比热光场更强的聚束效应在量子光学和量子测量中具有重要的应用.利用远离阈值的光学参量振荡（optical parametric oscillator,OPO）过程,在实验上产生了该弱压缩真空输出,运转波长在铯原子线附近.通过Hanbury-Brown-Twiss（HBT）测量了OPO输出光场的二阶关联函数,实验结果与理论分析基本一致.
英文摘要：
Photon statistics of the weak squeezed vacuum field from an optical parametric oscillatior （OPO） is investigated both in theory and by experiment . The strong photon bunching effect of weak squeezed vacuum field,which can be used as an important source in quantum optics and quantum measurement,was demonstrated. We have experimentally produced the weak squeezed vacuum at the center wavelength of D2 line of the cesium atom by the OPO operating far below the threshold . The second-order correlation function was measured based on the Hanbury-Brown-Twiss scheme,and the result is consistent with theoretical analysis.
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