论文标题
原位50不足的50次主动稳定红外和极端紫外线之间的延迟
In situ sub-50 attosecond active stabilization of the delay between infrared and extreme ultraviolet light pulses
论文作者
论文摘要
Attosecond科学的盛开（1 = $ 10^{ - 18} $ S）提出了极大地控制两种超短光脉冲之间的延迟，其中一个是强烈的，并且在可见的光谱范围内，而第二个则较弱，而在极端的超级violet光谱范围内。在这里，我们介绍了一种强大的技术，称为Lizard（用于调节泵探针延迟的激光修饰电离），从而使此泵探针延迟进行了主动稳定。该方法的原始性在于误差信号，该误差信号是从通过在电子光谱仪中使用带有两个叠加梁的电子光谱仪将气体目标化获得的两光子光电子信号计算出来的。相位正交中边带的调制使我们能够对泵探针相测量进行\ textit {intiT {intiT {intiT {intiT {intiT {intiT {intiT}，并在较大范围的延迟中使用均匀的噪声灵敏度来补偿波动。尽管干涉仪长度为几米，但我们在数小时内达到了28个RMS的长期稳定性。只要传播光束之一能够光电离，该方法可以应用于其他类型的两色干涉仪的稳定。
The blooming of attosecond science (1 as = $10^{-18}$ s) has raised the need to exquisitely control the delay between two ultrashort light pulses, one of them being intense and in the visible spectral range, while the second is weak and in the Extreme Ultra-Violet spectral range. Here we introduce a robust technique, named LIZARD (Laser-dressed IoniZation for the Adjustment of the pump-pRobe Delay), allowing an active stabilization of this pump-probe delay. The originality of the method lies in an error signal calculated from a two-photon photoelectron signal obtained by photoionizing a gas target in an electronic spectrometer with the two superimposed beams. The modulation of sidebands in phase quadrature allows us to perform an \textit{in situ} measurement of the pump-probe phase, and to compensate for fluctuations with an uniform noise sensitivity over a large range of delays. Despite an interferometer length of several meters, we achieved a long term stability of 28 as RMS over hours. This method could be applied to the stabilization of other types of two-color interferometers, provided that one of the propagating beams is capable of photoionizing a target.
