High-order elliptically polarized harmonic generation in extended molecules with ultrashort intense bichromatic circularly polarized laser pulses
- 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, Vol. 81, Issue 6; Other Information: DOI: 10.1103/PhysRevA.81.063412; (c) 2010 The American Physical Society; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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COMPUTERIZED SIMULATION
EXTREME ULTRAVIOLET RADIATION
HARMONIC GENERATION
HARMONICS
HYDROGEN IONS 2 PLUS
IONIZATION POTENTIAL
LASER RADIATION
MOLECULES
NUMERICAL SOLUTION
ORIENTATION
PHOTON-ATOM COLLISIONS
POLARIZATION
PONDEROMOTIVE FORCE
PULSES
SCHROEDINGER EQUATION
TIME DEPENDENCE
TWO-DIMENSIONAL CALCULATIONS
ATOM COLLISIONS
CATIONS
CHARGED PARTICLES
COLLISIONS
DIFFERENTIAL EQUATIONS
ELECTROMAGNETIC RADIATION
EQUATIONS
FREQUENCY MIXING
HYDROGEN IONS
IONS
MATHEMATICAL SOLUTIONS
MOLECULAR IONS
OSCILLATIONS
PARTIAL DIFFERENTIAL EQUATIONS
PHOTON COLLISIONS
RADIATIONS
SIMULATION
ULTRAVIOLET RADIATION
WAVE EQUATIONS