Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, UK.
Opt Lett. 2011 May 15;36(10):1746-8. doi: 10.1364/OL.36.001746.
We present a technique for frequency-resolved wavefront characterization of high harmonics based on lateral shearing interferometry. Tilted replicas of the driving laser pulse are produced by a Mach-Zehnder interferometer, producing separate focii in the target. The interference of the resulting harmonics on a flat-field extreme ultraviolet spectrometer yields the spatial phase derivative. A comprehensive set of spatial profiles, resolved by harmonic order, validate the technique and reveal the interplay of single-atom and macroscopic effects.
我们提出了一种基于横向剪切干涉的高次谐波频率分辨波前特性描述技术。倾斜的驱动激光脉冲复制品由马赫-曾德尔干涉仪产生，在目标中产生单独的焦点。在平面场极紫外光谱仪上，所得谐波的干涉产生空间相位导数。通过谐波阶数分辨的一套完整的空间分布验证了该技术，并揭示了单原子和宏观效应的相互作用。
