Spatiotemporal stability of a femtosecond hard-x-ray undulator source studied by control of coherent optical phonons.
We report on the temporal and spatial stability of the first tunable femtosecond undulator hard-x-ray source for ultrafast diffraction and absorption experiments. The 2.5-1 Angstrom output radiation is driven by an initial 50 fs laser pulse employing the laser-electron slicing technique. By using x-ray diffraction to probe laser-induced coherent optical phonons in bulk bismuth, we estimate an x-ray pulse duration of 140+/-30 fs FWHM with timing drifts below 30 fs rms measured over 5 days. Optical control of coherent lattice motion is demonstrated.
Beaud
P
P
Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland. paul.beaud@psi.ch
Johnson
S L
SL
Streun
A
A
Abela
R
R
Abramsohn
D
D
Grolimund
D
D
Krasniqi
F
F
Schmidt
T
T
Schlott
V
V
Ingold
G
G