Approaching single temporal mode operation in twin beams generated by pulse pumped high gain spontaneous four wave mixing
Approaching single temporal mode operation in twin beams generated by pulse pumped high gain spontaneous four wave mixing
复制标题
在脉冲泵浦高增益自发四波混频产生的双光束中接近单时间模式操作
DOI：
10.1364/oe.24.001096
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发表时间：
2016
期刊：
影响因子：
3.8
通讯作者：
Lei Yang
中科院分区：
文献类型：
--
作者：
Nannan Liu;Yuhong Liu;Xueshi Guo;Lei Yang
通过研究强度相关函数，我们从理论和实验方面研究了光纤中脉冲泵浦高增益自发四波混频（SFWM）产生的双光束的光谱/时间模式特性。结果表明，时间特性不仅取决于相位匹配条件和信号场和闲频场中应用的滤波器，还取决于 SFWM 的增益。当SFWM增益较低时，双光束的光谱/时间模式特性由相位匹配条件和光学滤波决定，并且通常具有多模性质，这导致单个信号/闲频光束的归一化强度相关函数的值大于1但明显小于2。然而，当 SFWM 的增益非常高时，我们证明了单个信号/闲频光束的归一化强度相关函数接近 2，这是单时间模式的特征。即使信号场和闲频场的频率高度相关，使得双光束在低增益状态下具有多种模式，情况也是如此。我们发现这种行为的原因是在高增益下基本模式相对于其他高阶模式的主导地位。我们的研究对于使用脉冲泵浦自发参量下变频和 SFWM 构建高质量多模压缩和纠缠态非常有用。
By investigating the intensity correlation function, we study the spectral/temporal mode properties of twin beams generated by the pulse-pumped high gain spontaneous four wave mixing (SFWM) in optical fiber from both the theoretical and experimental aspects. The results show that the temporal property depends not only on the phase matching condition and the filters applied in the signal and idler fields, but also on the gain of SFWM. When the gain of SFWM is low, the spectral/temporal mode properties of the twin beams are determined by the phase matching condition and optical filtering and are usually of multi-mode nature, which leads to a value larger than 1 but distinctly smaller than 2 for the normalized intensity correlation function of individual signal/idler beam. However, when the gain of SFWM is very high, we demonstrate the normalized intensity correlation function of individual signal/idler beam approaches to 2, which is a signature of single temporal mode. This is so even if the frequencies of signal and idler fields are highly correlated so that the twin beams have multiple modes in low gain regime. We find that the reason for this behavior is the dominance of the fundamental mode over other higher order modes at high gain. Our investigation is useful for constructing high quality multi-mode squeezed and entangled states by using pulse-pumped spontaneous parametric down-conversion and SFWM.