title: Spectral encoding of x-ray/optical relative delay.
abstract: We present a new technique for measuring the relative delay between a soft x-ray FEL pulse and an optical laser that indicates a sub 25 fs RMS measurement error. An ultra-short x-ray pulse photo-ionizes a semiconductor (Si(3)N(4)) membrane and changes the optical transmission. An optical continuum pulse with a temporally chirped bandwidth spanning 630 nm-710 nm interacts with the membrane such that the timing of the x-ray pulse can be determined from the onset of the spectral modulation of the transmitted optical pulse. This experiment demonstrates a nearly in situ single-shot measurement of the x-ray pulse arrival time relative to the ultra-short optical pulse.
authors: The Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA. mbionta@slac.stanford.edu
authors: Mina R
authors: MR
authors: Bionta
authors: H T
authors: HT
authors: Lemke
authors: J P
authors: JP
authors: Cryan
authors: J M
authors: JM
authors: Glownia
authors: C
authors: C
authors: Bostedt
authors: M
authors: M
authors: Cammarata
authors: J-C
authors: JC
authors: Castagna
authors: Y
authors: Y
authors: Ding
authors: D M
authors: DM
authors: Fritz
authors: A R
authors: AR
authors: Fry
authors: J
authors: J
authors: Krzywinski
authors: M
authors: M
authors: Messerschmidt
authors: S
authors: S
authors: Schorb
authors: M L
authors: ML
authors: Swiggers
authors: R N
authors: RN
authors: Coffee