High-order elliptically polarized harmonic generation in extended molecules with ultrashort intense bichromatic circularly polarized laser pulses

Journal Article · Tue Jun 15 04:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.063412· OSTI ID:21437921

Yuan, Kai-Jun; Bandrauk, Andre D ^[1]

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1. Laboratoire de Chimie Theorique, Faculte des Sciences, Universite de Sherbrooke, Sherbrooke, Quebec, J1K 2R1 (Canada)

Numerical solutions of the time-dependent Schroedinger equation (TDSE) for a two-dimensional H{sub 2}{sup +} molecule excited by a bichromatic ultrashort intense circularly polarized laser pulse with frequencies {omega}{sub 0} and 2{omega}{sub 0} and relative carrier envelope phase {phi} are used to explore the generation of high-order elliptically polarized harmonics as a function of internuclear distance R. Optimal values of {phi} and R for efficient and maximum molecular high-order harmonic generation (MHOHG) are determined from a classical model of collision with neighboring ions and confirmed from the TDSE nonperturbative simulations. Maximum elliptically polarized harmonic energies of I{sub p}+13.5U{sub p} are found, where I{sub p} is the ionization potential and U{sub p}=I{sub 0}/4m{sub e{omega}0}{sup 2} is the ponderomotive energy at intensity I{sub 0} and frequency {omega}{sub 0}. The polarization properties of MHOHG, phase difference {delta}, ellipticity {epsilon}, and orientation angle {phi} are presented as well. The high efficiency of the proposed MHOHG scheme should be useful for production of elliptically polarized attosecond extreme ultraviolet pulses.

• OSTI ID: 21437921
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 81; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
CATIONS
CHARGED PARTICLES
COLLISIONS
COMPUTERIZED SIMULATION
DIFFERENTIAL EQUATIONS
ELECTROMAGNETIC RADIATION
EQUATIONS
EXTREME ULTRAVIOLET RADIATION
FREQUENCY MIXING
HARMONIC GENERATION
HARMONICS
HYDROGEN IONS
HYDROGEN IONS 2 PLUS
IONIZATION POTENTIAL
IONS
LASER RADIATION
MATHEMATICAL SOLUTIONS
MOLECULAR IONS
MOLECULES
NUMERICAL SOLUTION
ORIENTATION
OSCILLATIONS
PARTIAL DIFFERENTIAL EQUATIONS
PHOTON COLLISIONS
PHOTON-ATOM COLLISIONS
POLARIZATION
PONDEROMOTIVE FORCE
PULSES
RADIATIONS
SCHROEDINGER EQUATION
SIMULATION
TIME DEPENDENCE
TWO-DIMENSIONAL CALCULATIONS
ULTRAVIOLET RADIATION
WAVE EQUATIONS