Author(s)

Samira Barmaki^*, Salima Hennani, Marc-André Albert, Stéphane Laulan

Laboratoire de Physique Computationnelle et Photonique, Université de Moncton Campus de Shippagan, Shippagan, Canada.

We present in this paper an investigation of the nonlinear process of above-threshold ionization. The process arises when an atomic or molecular system, exposed to an intense laser pulse, continues to absorb more photons than that needed for the ionization to occur. We trigger this nonlinear process in a simple molecular system by exposing it to an intense transform-limited Gaussian laser pulse of 267-nm wavelength which is the third harmonic of an 800-nm wavelength Tisapphire laser. We explore the characteristics of the process by analyzing the kinetic-energy spectra of the electrons ejected from the molecular system under different laser peak intensities.

Nonlinear Ionization Process, Intense Femtosecond Laser Fields, Multiphoton Absorption in Molecular Continuum, Transform-Limited Gaussian Laser Pulse

Barmaki, S. , Hennani, S. , Albert, M. and Laulan, S. (2014) Nonlinear Ionization of Molecules by Intense Transform-Limited Gaussian Laser Pulses. Optics and Photonics Journal, 4, 309-315. doi: 10.4236/opj.2014.411031.