Fast spectroscopic imaging using extreme ultraviolet interferometry
Hannah C. Strauch (University of Göttingen)
Fengling Zhang (Advanced Research Center for Nanolithography)
Stefan Mathias (University of Göttingen)
Thorsten Hohage (University of Göttingen)
Stefan Witte (TU Delft - Applied Sciences, Advanced Research Center for Nanolithography)
G. S. Matthijs Jansen (University of Göttingen)
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Abstract
Extreme ultraviolet pulses as generated by high harmonic generation (HHG) are a powerful tool for both time-resolved spectroscopy and coherent diffractive imaging. However, the combination of these techniques to achieve spatio-spectro-temporal data remains hardly explored due to the challenging and time-consuming data acquisition. Here, we present Fourier-transform spectroscopic holography (FTSH), an interferometric approach to spectroscopic imaging that combines Fourier-transform spectroscopy with holography. By encoding spectral information in the measured diffraction pattern, FTSH dramatically reduces the sampling requirements by one order of magnitude. This enables us to record full spectroscopic imaging data in less than 2 minutes, and makes FTSH especially promising for femtosecond time-resolved nano-spectroscopy using table-top HHG sources.