Spatially resolved Fourier transform spectroscopy in the extreme ultraviolet

G.S.M. Jansen, Denis Rudolf, Lars Freisem, K.S.E. Eikema, S.M. Witte

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Abstract

Coherent extreme ultraviolet (XUV) radiation produced by
table-top high-harmonic generation (HHG) sources provides
a wealth of possibilities in research areas ranging from attosecond
physics to high-resolution coherent diffractive imaging.
However, it remains challenging to fully exploit the coherence
of such sources for interferometry and Fourier transform spectroscopy
(FTS). This is due to the need for a measurement
system that is stable at the level of a wavelength fraction, yet
allows controlled scanning of time delays. Here, we demonstrate
XUV interferometry and FTS in the 17–55 nm wavelength
range using an ultrastable common-path interferometer
suitable for high-intensity laser pulses that drive the HHG
process. This approach enables the generation of fully coherent
XUV pulse pairs with sub-attosecond timing variation, tunable
time delay, and a clean Gaussian spatial mode profile. We
demonstrate the capabilities of our XUV interferometer by
performing spatially resolved FTS on a thin film composed of
titanium and silicon nitride.
Original languageEnglish
Pages (from-to)1122-1125
Number of pages4
JournalOptica
Volume3
Issue number10
Early online date3 Oct 2016
DOIs
Publication statusPublished - 2016

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