Correction for the Research Article: “High-flux soft x-ray harmonic generation from ionization-shaped few-cycle laser pulses” by A. S. Johnson, D. R. Austin, D. A. Wood, C. Brahms, A. Gregory, K. B. Holzner, S. Jarosch, E. W. Larsen, S. Parker, C. S. Strüber, P. Ye, J. W. G. Tisch and J. P. Marangos

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Science Advances  15 May 2020:
Vol. 6, no. 20, eabc5176
DOI: 10.1126/sciadv.abc5176

In the research article “High-flux soft x-ray harmonic generation from ionization-shaped few-cycle laser pulses, following a re-analysis of the computation of the harmonic flux in the water window we have found that there was an error in the reported integrated flux values. The flux per unit bandwidth values remain correct as stated. The re-evaluated maximum flux and pulse energies integrated across water window wavelengths (284 eV to 540 eV) are 4×107 photons/s and 2 pJ, respectively, for harmonics generated in Neon and 4×106 photons/s, 0.2 pJ for harmonics generated in Helium. Thus, we incorrectly stated that the photon flux is an order of magnitude higher than previously reported, whereas the corrected numbers make our total flux comparable to previous measurements. As pointed out in the original manuscript, our analysis of the overdriven regime applies to previous sources in this photon energy range and thus our results and conclusions remain fully valid.

The authors would like to thank Nariyuki Saito at the University of Tokyo for bringing the discrepancy between per-unit-bandwidth fluxes and total fluxes to our attention.

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