title: Isolated sub-fs XUV pulse generation in Mn plasma ablation.
abstract: We report studies of high-order harmonic generation in laser-produced manganese plasmas using sub-4-fs drive laser pulses. The measured spectra exhibit resonant enhancement of a small spectral region of about 2.5 eV width around the 31st harmonic (~50eV). The intensity contrast relative to the directly adjacent harmonics exceeds one order of magnitude. This finding is in sharp contrast to the results reported previously for multi-cycle laser pulses [Physical Review A 76, 023831 (2007)]. Theoretical modelling suggests that the enhanced harmonic emission forms an isolated sub-femtosecond pulse.
authors.affiliation: Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2AZ, UK. r.ganeev@imperial.ac.uk
authors.forename: R A
authors.initials: RA
authors.lastname: Ganeev
authors.forename: T
authors.initials: T
authors.lastname: Witting
authors.forename: C
authors.initials: C
authors.lastname: Hutchison
authors.forename: F
authors.initials: F
authors.lastname: Frank
authors.forename: M
authors.initials: M
authors.lastname: Tudorovskaya
authors.forename: M
authors.initials: M
authors.lastname: Lein
authors.forename: W A
authors.initials: WA
authors.lastname: Okell
authors.forename: A
authors.initials: A
authors.lastname: Zaïr
authors.forename: J P
authors.initials: JP
authors.lastname: Marangos
authors.forename: J W G
authors.initials: JW
authors.lastname: Tisch