Influence of laser frequency chirp on deuteron energy from laser-driven deuterated methane cluster expansion
College of Physics and Electronic Information, Tianjin Normal University, Tianjin, 300387, P.R. China
2 State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, PO Box 800-211, Shanghai, 201800, P.R. China
Revised: 23 February 2010
Published online: 26 April 2010
The simulations of three-dimensional particle dynamics are carried out to investigate the Coulomb explosion dynamics of deuterated methane clusters under the irradiation of an ultrashort intense laser pulse. The final kinetic energy of deuterons produced from the cluster explosion is calculated as a function of the pulse width, the laser intensity and the pulse chirp. It is found that the deuteron energy obtained in an intense laser pulse with negative chirp is higher than that with positive chirp, which agrees qualitatively with the experimental results reported by Fukuda et al. [Y. Fukuda et al., Phys. Rev. A 67, 061201 (2003)].
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2010