Speaker
Description
I will present the design and commissioning results of a broadband hard x-ray delay line for generating attosecond pulse pairs. The system utilizes an unconventional delay adjustment mechanism, in which the relative path length between the two beams is controlled through the rotation of an x-ray mirror pair. The exit beam pointing stability is guaranteed by the mirror-pair self-error-compensating geometry, thereby enabling stable fast continuous delay scan with sub-20 attosecond precision.
As a first application, the delay line is operated as an autocorrelator. By using the instantaneous nonlinearity of non-sequential two-photon absorption, we directly characterize the pulse duration of the hard x-ray attosecond pulses at the Linac Coherent Light Source to be on average 170 attoseconds, with a dependence on the bandwidth of the pulse. This delay line will further enable attosecond x-ray pump x-ray probe capability and establish a robust platform for hard x-ray nonlinear spectroscopy and diffraction, thereby opening new opportunities to investigate valence electron dynamics at sub-femtosecond timescales.
Funding Agency
Use of the Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No
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