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Performing the triple auto-correlations of picosecond optical pulsetrains with an photo electromotive force detector

机译：使用光电电动势检测器执行皮秒光学脉冲序列的三重自相关

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Here, we consider the possibility of involving the photo-EMF detectors in registration of the parameters peculiar to ultra-short optical pulses, and it is compared whit the recently triple correlator via Direct and Cascade Third Harmonic Generation. Knowledge of triple auto-correlation function, whose Fourier transformation shapes the corresponding bispectrum, makes possible recovering such train-average parameters as, for instance, the pulse width and frequency chirp as well as revealing asymmetry of ultra-short pulse envelope. The main advantage of applying the photo-EMF detectors lies in an opportunity to detect triple correlations directly, without any intermediate frequency conversion with optical nonlinear processes in additional crystals. Then, the theory of three-beam-correlations at photosensitive layer of the photo-EMF detector is developed, so that principal possibility of registering the high-order-correlations is demonstrated. It can be done within schematic arrangement including the three-beam Michelson interferometer, so that the obtained high-order-correlations have non-traditional form and need rather specific algorithm for their further processing. Also, the experimental characterizations are presented for gallium arsenide (GaAs) semiconductor and the poly-fluoren 6-co-triphenyldiamine (PF6-TPD) photo-conductor-polymer, which both exhibit the photo-EMF-effect. They both exhibit high-pass transfer functions that give us high vibration stability. This novel approach provides more reliable analyzing train-average parameters of picosecond pulses due to significantly higher level of the output optical signals under processing.
机译：在这里，我们考虑了将光电动势检测器纳入超短光脉冲特有的参数配准中的可能性，并通过最近的三重相关器通过直接和级联第三谐波生成进行了比较。对三重自相关函数的了解（其傅里叶变换塑造了相应的双谱），使得恢复诸如脉冲宽度和频率线性调频等列平均参数以及揭示超短脉冲包络的不对称性成为可能。应用光电动势检测器的主要优势在于可以直接检测三重相关性，而无需在附加晶体中通过光学非线性过程进行任何中频转换。然后，发展了光电动势检测器的光敏层的三光束相关性理论，从而证明了记录高阶相关性的主要可能性。可以在包括三束迈克尔逊干涉仪的示意图中完成，因此获得的高阶相关具有非传统形式，并且需要对其进行进一步处理的特定算法。此外，还给出了砷化镓（GaAs）半导体和多氟6-共-三苯基二胺（PF6-TPD）光电导体聚合物的实验特性，它们均表现出光电动势。它们都具有高通传递函数，可为我们提供高振动稳定性。由于正在处理的输出光信号的水平明显较高，因此这种新颖的方法可提供更可靠的皮秒脉冲序列平均参数分析。

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