Intracavity high harmonic generation (iHHG) has proven useful for generating frequency combs in the challenging-to-reach vacuum-ultraviolet (VUV) and extreme-ultraviolet (XUV) spectral regions. To measure complex spectra, however (e.g. molecules or Rydberg transitions), single-comb spectroscopy is often not suitable. Dual-comb spectroscopy (DCS) can overcome these limitations by providing broad-bandwidth, comb-resolved spectra without ambiguity, as has been demonstrated in the IR by many groups. In this paper we show that we are able to couple two independent high power (>30 Watts) fs combs to a single enhancement cavity to greatly simplify our approach towards DCS in the VUV and XUV. Previous work by our group and others has shown that a fundamental limit to iHHG stems from the plasma dynamics at the intra-cavity focus [1,2]. While a single-cavity approach to DCS simplifies the experimental setup, it does not eliminate the complications arising from intracavity ionization dynamics. To more precisely measure these effects and characterize plasma induced phase shifts on the pulse pairs, we demonstrate a novel technique for measuring these dynamics in real-time using our dual-comb enhancement cavity. The utility of this method is that it allows us to characterize in a fully time-resolved manner intracavity nonlinearities that typically limit iHHG experiments.

© 2015 IEEE

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