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16 May 1994 Soft x-ray pulse-length measurement by pump-probe absorption spectroscopy
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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.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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);

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