title: Enhancement of high harmonics from plasmas using two-color pump and chirp variation of 1 kHz Ti:sapphire laser pulses.
abstract: We have investigated resonance effects in high-order harmonic generation (HHG) within laser-produced plasmas. We demonstrate a significantly improved harmonic yield by using two-color pump-induced enhancement and a 1 kHz pulse repetition rate. Together with an increased HHG output, the even harmonics in the cutoff region were enhanced with respect to odd harmonics. We report the observation of a resonance-induced growth in intensity of 20th harmonic in silver plasma (2×), 26th harmonic in vanadium plasma (4×), and 28th harmonic in chromium plasma (5×).
authors.affiliation: Blackett Laboratory, Imperial College London, London SW7 2BW, UK. rashid_ganeev@mail.ru
authors.forename: R A
authors.initials: RA
authors.lastname: Ganeev
authors.forename: C
authors.initials: C
authors.lastname: Hutchison
authors.forename: A
authors.initials: A
authors.lastname: Zaïr
authors.forename: T
authors.initials: T
authors.lastname: Witting
authors.forename: F
authors.initials: F
authors.lastname: Frank
authors.forename: W A
authors.initials: WA
authors.lastname: Okell
authors.forename: J W G
authors.initials: JW
authors.lastname: Tisch
authors.forename: J P
authors.initials: JP
authors.lastname: Marangos
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D003116:Color; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D058626:Plasma Gases / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
chemical_list: D058626:Plasma Gases; D014025:Titanium; D000537:Aluminum Oxide