Soft x-ray pulse-length measurement by pump-probe absorption spectroscopy

Harry W.K. Tom; Mark Sher; Umar Mohideen; Obert R. Wood II; Gary D. Aumiller; Thomas J. McIlrath; Jeffrey Bokor; Richard R. Freeman; Jack Sugar

doi:10.1117/12.175870

16 May 1994 Soft x-ray pulse-length measurement by pump-probe absorption spectroscopy

Harry W.K. Tom, Mark Sher, Umar Mohideen, Obert R. Wood II, Gary D. Aumiller, Thomas J. McIlrath, Jeffrey Bokor, Richard R. Freeman, Jack Sugar

Author Affiliations +

Proceedings Volume 2116, Generation, Amplification, and Measurement of Ultrashort Laser Pulses; (1994) https://doi.org/10.1117/12.175870
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

We have demonstrated a system for subpicosecond, soft-x-ray continuum, pump-probe absorption spectroscopy. Using multiphoton ionization to abruptly change the x-ray absorption spectra of a gas, we have measured the temporal profile of laser-generated x-ray pulses near 90 eV. Although the x-ray pulses from a laser-generated plasma here were only as short as approximately 20 psec, the technique is extendible to higher energy x rays that will have pulse durations approaching 100 fsec. We also present the absorption spectrum of Kr ions produced under conditions of high intensity non-resonant multiphoton ionization. The spectra are identified with a fit to the Cowan code.

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Harry W.K. Tom, Mark Sher, Umar Mohideen, Obert R. Wood II, Gary D. Aumiller, Thomas J. McIlrath, Jeffrey Bokor, Richard R. Freeman, and Jack Sugar "Soft x-ray pulse-length measurement by pump-probe absorption spectroscopy", Proc. SPIE 2116, Generation, Amplification, and Measurement of Ultrashort Laser Pulses, (16 May 1994); https://doi.org/10.1117/12.175870

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