We present amplitude and phase characterization of short optical pulses using dual comb spectroscopy, where one comb is a well characterized stable frequency comb and the second is the pulse source to be measured. We demonstrated that the technique is suitable for truly arbitrary repetition rates of the two combs. Moreover, the system is highly sensitive and was shown to enable measurements of low intensity pulses. In one experiment we used relatively long (80 ps) pulses generated by an actively mode locked semiconductor laser at a repetition rate that is slightly different from that of the reference laser. In a second experiment, we employed 2 ps pulses generated by a fiber laser whose repetition rate differs significantly from that of the the reference laser. We benchmark the method by comparison with conventional methods of pulse characterization. Furthermore, limitations due to fluctuations of the carrier envelope offset and the repetition rate, were addressed and overcome by implementing computational non-uniform sampling of measured interferograms.

中文翻译：

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使用双梳状光谱仪的高分辨率和快速测量任意光脉冲

我们使用双梳子光谱技术介绍了短光脉冲的幅度和相位特性，其中一个梳子是特征明确的稳定频率梳，第二个梳子是要测量的脉冲源。我们证明了该技术适用于两个梳子的真正任意重复率。此外，该系统具有很高的灵敏度，并被证明可以测量低强度脉冲。在一个实验中，我们使用了由有源锁模半导体激光器产生的相对较长的脉冲（80 ps），其重复频率与参考激光器的重复频率略有不同。在第二个实验中，我们采用了由光纤激光器产生的2 ps脉冲，其重复率与参考激光器的重复率显着不同。我们通过与常规脉冲表征方法进行比较来对该方法进行基准测试。此外，通过实现对测量干涉图的计算非均匀采样，解决并克服了由于载波包络偏移和重复率的波动而引起的限制。