title: Ultra-high-precision time control system over any long time delay for laser pump and synchrotron x-ray probe experiment.
abstract: An ultra-high-precision clock system for long time delay has been developed for picosecond time-resolved x-ray diffraction measurements using synchrotron radiation (SR) pulses and synchronized femtosecond laser pulses. The time delay control between pump laser pulse and the probe SR pulse was achieved by combining an in-phase quadrature modulator and a synchronous counter. This method allowed us to change the delay time by a nearly infinite amount while maintaining the precision of +/-8.40 ps. Time-resolved diffraction measurements using the delay control system were demonstrated for precise measurement of an acoustic velocity in a single crystal of gallium arsenide.
authors.affiliation: Japan Synchrotron Radiation Research Institute/SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan.
authors.forename: Yoshimitsu
authors.initials: Y
authors.lastname: Fukuyama
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Yasuda
authors.forename: Jungeun
authors.initials: J
authors.lastname: Kim
authors.forename: Haruno
authors.initials: H
authors.lastname: Murayama
authors.forename: Takashi
authors.initials: T
authors.lastname: Ohshima
authors.forename: Yoshihito
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Shigeru
authors.initials: S
authors.lastname: Kimura
authors.forename: Hayato
authors.initials: H
authors.lastname: Kamioka
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Moritomo
authors.forename: Koshiro
authors.initials: K
authors.lastname: Toriumi
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Tanaka
authors.forename: Kenichi
authors.initials: K
authors.lastname: Kato
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Ishikawa
authors.forename: Masaki
authors.initials: M
authors.lastname: Takata