Abstract
We report the generation and measurement of isolated soft‐x‐ray pulses (λx = 14 nm) with a duration of τx = 650 ± 150 attoseconds by using few‐cycle intense visible/near‐infrared (λ0 = 750 nm) laser pulses. For the temporal characterization of the x‐ray pulses, a cross‐correlation technique relying on laser field assisted x‐ray photoemission from Krypton atoms was employed. The experimental results bear direct evidence of the x‐ray pulse being synchronized to the field oscillations of the visible light pulse with attosecond precision and of bound‐free electronic transitions from the 4p state of krypton responding to 90‐eV excitation on an attosecond time scale. As a first demonstration of attosecond metrology, the synchronized single sub‐fs x‐ray pulses were used for tracing the electric field oscillations in a visible light wave with a resolution of better than 150 as.
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