Open AccessEnhancement of high harmonics from plasmas using two-color pump and chirp variation of 1 kHz Ti:sapphire laser pulses
Author(s) -
R. A. Ganeev,
C. Hutchison,
A. Zaïr,
Tobias Witting,
F. Frank,
W. A. Okell,
J. W. G. Tisch,
J. P. Marangos
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.000090
Subject(s) - harmonics , high harmonic generation , laser , optics , chirp , plasma , materials science , harmonic , sapphire , resonance (particle physics) , femtosecond , atomic physics , physics , acoustics , voltage , quantum mechanics
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×).