Abstract

We apply a cascaded four-wave mixing process in the extreme ultraviolet (XUV) region using two collinear multiple-cycle laser pulses with incommensurate frequencies (wavelengths 1400 and 800 nm) to construct a two-dimensional cross-correlation spectrum. We show that the two-dimensional spectrum can be used to extract the amplitude and phase modifications of the atomic dipole moments of the coupled states in atomic krypton interacting with the intense pulsed laser light. The experimental configuration and a simple model for qualitative interpretation allow us to demonstrate the validity and power of the 2D spectroscopy method in the XUV region.

© 2019 Optical Society of America

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