Third-harmonic generation of mode-locked Nd:glass laser pulses in phase-matched Rb-Xe mixtures

Physics – Optics

Scientific paper

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Harmonic Generations, Laser Mode Locking, Metal-Gas Systems, Neodymium Lasers, Nonlinear Optics, Ultrashort Pulsed Lasers, Gas Mixtures, Metal Vapors, Phase Control, Picosecond Pulses, Refractivity, Rubidium, Xenon

Scientific paper

Third-harmonic generation in phase-matched Rb-Xe mixtures has been produced using 7- and 300-psec pulses of a mode-locked Nd:glass laser with peak powers up to 200 MW. Maximum energy conversion efficiencies of 1.8% have been achieved. A theoretical analysis is given which includes the transient excitations of the system and the linear and nonlinear susceptibilities up to seventh order in the perturbation. The phase-matching condition for parallel and focused beams has been investigated showing the influence of density gradients at the boundaries of the nonlinear medium (Rb vapor) and of the field-dependent changes of the refractive index at high input intensities.

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