标题： InGaAs PIN光电二极管用于飞秒激光微波信号生成的幅度到相位转换 显示英文标题

标题： Amplitude to phase conversion of InGaAs pin photo-diodes for femtosecond lasers microwave signal generation

摘要： 当光电二极管被飞秒激光的脉冲序列照射时，它会在其带宽内产生重复率谐波的微波成分。这些成分的相位（相对于光学脉冲序列）已知与每脉冲的光学能量有关。我们对这种依赖关系进行了实验研究，使用铒掺杂光纤基飞秒激光器产生的超短脉冲照射InGaAs pin光电二极管。在两个典型探测器上测量了接近和超过饱和的大范围入射脉冲能量的能-相依赖关系，这些探测器常用于基于飞秒激光的光学频率梳的光学频率计量。当扫描光学脉冲能量时，将相位变化与能量变化相关的系数发现会在正负值之间交替，对于重复率的高次谐波有许多消失点。通过在这些消失点之一附近操作该系统，商用核心光纤基飞秒激光器的典型幅度噪声水平足够低，可以生成最先进的超低相位噪声微波信号，几乎不受幅度到相位转换相关噪声的影响。 显示英文摘要

摘要： When a photo-diode is illuminated by a pulse train from a femtosecond laser, it generates microwaves components at the harmonics of the repetition rate within its bandwidth. The phase of these components (relative to the optical pulse train) is known to be dependent on the optical energy per pulse. We present an experimental study of this dependence in InGaAs pin photo-diodes illuminated with ultra-short pulses generated by an Erbium-doped fiber based femtosecond laser. The energy to phase dependence is measured over a large range of impinging pulse energies near and above saturation for two typical detectors, commonly used in optical frequency metrology with femtosecond laser based optical frequency combs. When scanning the optical pulse energy, the coefficient which relates phase variations to energy variations is found to alternate between positive and negative values, with many (for high harmonics of the repetition rate) vanishing points. By operating the system near one of these vanishing points, the typical amplitude noise level of commercial-core fiber-based femtosecond lasers is sufficiently low to generate state-of-the-art ultra-low phase noise microwave signals, virtually immune to amplitude to phase conversion related noise.