Spectral properties of broadband biphotons generated from PPMgSLT under a type-II phase-matching condition
Spectral properties of broadband biphotons generated from PPMgSLT under a type-II phase-matching condition
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DOI：
10.1364/josab.32.000550
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发表时间：
2015-04
影响因子：
1.9
通讯作者：
N. Bisht;R. Shimizu
中科院分区：
文献类型：
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作者：
N. Bisht;R. Shimizu
报道了基于周期极化掺镁化学计量比LiTaO_3(PPMgSLT)的脉冲第二类自发参数下转换产生的宽带双光子的光谱特性。光谱和干涉测量被用来表征双光子源。对于光谱测量，我们使用了常规光谱和联合光谱强度测量。对于干涉测量，分别进行了和频和差频双光子干涉实验，以估计光谱相关性和确保双光子的宽带性质。用皮秒掺钛蓝宝石作为泵浦光源时，双光子的光谱宽度大于40 nm。最后，给出了双光子干涉可见度与联合光谱分布对称性的关系。
We report the spectral properties of broadband biphotons generated by pulsed type-II spontaneous parametric down-conversion based on a periodically poled MgO-doped stoichiometric LiTaO3 (PPMgSLT). Spectroscopic and interferometric measurements were used to characterize the biphoton source. For the spectroscopic measurements, we used conventional spectroscopy and joint spectral intensity measurements. For the interferometric measurements, sum- and difference-frequency two-photon interference experiments were performed to estimate the spectral correlation and to ensure the broadband nature of biphotons, respectively. When using a picosecond Ti:sapphire as a pump source, the spectral width of biphotons was over 40 nm. Finally, we demonstrated the relationship between the two-photon interference visibility and the symmetricity of the joint spectral distribution.