Huppert M, Jordan I, Wörner H J
Laboratory of Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, CH-8093 Zurich, Switzerland.
Rev Sci Instrum. 2015 Dec;86(12):123106. doi: 10.1063/1.4937623.
We describe a versatile and compact beamline for attosecond spectroscopy. The setup consists of a high-order harmonic source followed by a delay line that spatially separates and then recombines the extreme-ultraviolet (XUV) and residual infrared (IR) pulses. The beamline introduces a controlled and actively stabilized delay between the XUV and IR pulses on the attosecond time scale. A new active-stabilization scheme combining a helium-neon-laser and a white-light interferometer minimizes fluctuations and allows to control delays accurately (26 as rms during 1.5 h) over long time scales. The high-order-harmonic-generation region is imaged via optical systems, independently for XUV and IR, into an interaction volume to perform pump-probe experiments. As a consequence of the spatial separation, the pulses can be independently manipulated in intensity, polarization, and frequency content. The beamline can be combined with a variety of detectors for measuring attosecond dynamics in gases, liquids, and solids.
我们描述了一种用于阿秒光谱学的多功能紧凑型光束线。该装置由一个高次谐波源和一个延迟线组成，延迟线对极紫外（XUV）脉冲和残余红外（IR）脉冲进行空间分离，然后再将它们重新组合。该光束线在阿秒时间尺度上，在XUV和IR脉冲之间引入了可控且主动稳定的延迟。一种结合氦氖激光器和白光干涉仪的新型主动稳定方案可将波动降至最低，并能在长时间尺度上精确控制延迟（1.5小时内均方根误差为26阿秒）。通过光学系统，分别针对XUV和IR，将高次谐波产生区域成像到一个相互作用体积中，以进行泵浦 - 探测实验。由于空间分离，脉冲在强度、偏振和频率成分方面可以独立操控。该光束线可与各种探测器组合，用于测量气体、液体和固体中的阿秒动力学。
