title: Extreme ultraviolet supercontinua supporting pulse durations of less than one atomic unit of time.
abstract: Double optical gating of high-harmonic generation was used to obtain supercontinuous spectra in the extreme UV (XUV) region including the water window. The spectra supported a 16 as pulse duration that is below one atomic unit of time (24 as). The dependence of the gated spectra on the carrier-envelope phase of the laser provided evidence that isolated attosecond pulses were generated. In addition, to ensure the temporal coherence of the XUV light, the pulse shape and phase of isolated 107 as XUV pulses using a portion of the spectrum were characterized by attosecond streaking.
authors.affiliation: J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Mashiko
authors.forename: Steve
authors.initials: S
authors.lastname: Gilbertson
authors.forename: Michael
authors.initials: M
authors.lastname: Chini
authors.forename: Ximao
authors.initials: X
authors.lastname: Feng
authors.forename: Chenxia
authors.initials: C
authors.lastname: Yun
authors.forename: He
authors.initials: H
authors.lastname: Wang
authors.forename: Sabih D
authors.initials: SD
authors.lastname: Khan
authors.forename: Shouyuan
authors.initials: S
authors.lastname: Chen
authors.forename: Zenghu
authors.initials: Z
authors.lastname: Chang