论文标题
超快单光子级脉冲表征可变的电形剪切干涉法
Variable electro-optic shearing interferometry for ultrafast single-photon-level pulse characterization
论文作者
论文摘要
尽管有多种可用方法，但超快脉冲的表征仍然是一项艰巨的努力，尤其是在单光子水平上。我们引入了脉冲表征方案，该方案映射了其短期傅立叶变换的大小。与许多众所周知的解决方案相反，它不需要非线性效应，因此适用于单光子级测量。我们的方法是基于引入一系列受控的时间和频移，其中后者是通过电气调节器进行的，允许完全电子的实验对照。我们表征了经典和单光子级脉冲的完整光谱和时间宽度，并成功地重建了它们的光谱相和振幅。该方法可以通过实现相敏度测量来扩展，并且自然非常适合部分分散光。
Despite the multitude of available methods, the characterisation of ultrafast pulses remains a challenging endeavour, especially at the single-photon level. We introduce a pulse characterisation scheme that maps the magnitude of its short-time Fourier transform. Contrary to many well-known solutions it does not require nonlinear effects and is therefore suitable for single-photon-level measurements. Our method is based on introducing a series of controlled time and frequency shifts, where the latter is performed via an electro-optic modulator allowing a fully-electronic experimental control. We characterized the full spectral and temporal width of a classical and single-photon-level pulse and successfully reconstructed their spectral phase and amplitude. The method can be extended by implementing a phase-sensitive measurement and is naturally well-suited to partially-incoherent light.
