title: Tunable ultrafast extreme ultraviolet source for time- and angle-resolved photoemission spectroscopy.
abstract: We present a laser-based apparatus suitable for visible pump/extreme UV (XUV) probe time-, energy-, and angle-resolved photoemission spectroscopy utilizing high-harmonic generation from a noble gas. Tunability in a wide range of energies (currently 20-36 eV) is achieved by using a time-delay compensated monochromator, which also preserves the ultrashort duration of the XUV pulses. Using an amplified laser system at 10 kHz repetition rate, approximately 10(9)-10(10) photons/s per harmonic are made available for photoelectron spectroscopy. Parallel energy and momentum detection is carried out in a hemispherical electron analyzer coupled with an imaging detector. First applications demonstrate the capabilities of the instrument to easily select the probe wavelength of choice, to obtain angle-resolved photoemission maps (GaAs and URu(2)Si(2)), and to trace ultrafast electron dynamics in an optically excited semiconductor (Ge).
authors.affiliation: MPA-CINT, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: G L
authors.initials: GL
authors.lastname: Dakovski
authors.forename: Y
authors.initials: Y
authors.lastname: Li
authors.forename: T
authors.initials: T
authors.lastname: Durakiewicz
authors.forename: G
authors.initials: G
authors.lastname: Rodriguez