Abstract
The development of schemes for coherent nonlinear time-domain spectroscopy in the extreme-ultraviolet regime (XUV) has so far been impeded by experimental difficulties that arise at these short wavelengths. In this work we present a novel experimental approach, which facilitates the timing control and phase cycling of XUV pulse sequences produced by harmonic generation in rare gases. The method is demonstrated for the generation and high spectral resolution characterization of narrow-bandwidth harmonics (≈14 eV) in argon and krypton. Our technique simultaneously provides high phase stability and a pathway-selective detection scheme for nonlinear signals—both necessary prerequisites for all types of coherent nonlinear spectroscopy.
Highlights
Coherent nonlinear spectroscopy in the time domain is a powerful tool to study photoinduced dynamics in complex quantum systems on their natural time scale [1]
In this work we present a novel experimental approach, which facilitates the timing control and phase cycling of XUV pulse sequences produced by harmonic generation in rare gases
By performing high-resolution linear interferometric cross correlations (CCs) of the XUV pulses, we find that the resulting XUV radiation is extremely narrowband
Summary
Coherent nonlinear spectroscopy in the time domain is a powerful tool to study photoinduced dynamics in complex quantum systems on their natural time scale [1]. Sequences of phase-locked ultrashort laser pulses interact with a system, simultaneously exciting many quantum pathways. Observables are measured as a function of the time delay between the pulses, which in combination with Fourier-transform allows to observe spectral signatures. These methods require generation of phase-locked pulse sequences and highly sensitive pathway-selective detection methods [1, 4]. While this is readily achieved in the visible regime, the simultaneous experimental realization of both ingredients constitutes a major challenge at XUV wavelengths
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
