Quadratic autocorrelation of free-electron laser radiation and photocurrent saturation in two-photon quantum well infrared photodetectors
Quadratic autocorrelation of free-electron laser radiation and photocurrent saturation in two-photon quantum well infrared photodetectors
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双光子量子阱红外光电探测器中自由电子激光辐射与光电流饱和的二次自相关
DOI：
10.1063/1.2357936
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发表时间：
2006
影响因子：
4
通讯作者：
M. Walther
中科院分区：
文献类型：
--
作者：
H. Schneider;O. Drachenko;S. Winnerl;M. Helm;M. Walther
利用自由电子激光装置FELBE，研究了强度对双光子量子阱红外探测器（QWIPs）测量的二次自相关的影响。在高照度下，双光子QWIP的光电流饱和会影响自相关迹线的形状。他们用不同的分析模型描述了饱和机理，并将光电流非线性类比为线性qwip，并给出了可以观察到真正的二次行为的条件。虽然这些研究是在77K下进行的，但双光子qwip在室温下的性质也将得到解决。
Using the free-electron laser facility FELBE, the authors have studied the influence of the intensity on the quadratic autocorrelation measured with two-photon quantum well infrared photodetectors (QWIPs). At high illumination powers, the shape of the autocorrelation trace is affected by photocurrent saturation of the two-photon QWIP. They describe the saturation mechanism by different analytical models taking account of the photocurrent nonlinearity in analogy to linear QWIPs and give conditions where true quadratic behavior can be observed. While these studies were carried out at 77K, properties of two-photon QWIPs at room temperature will also be addressed.