Generation of the third harmonic of near IR femtosecond laser radiation tightly focused into the bulk of a transparent dielectric in the regime of plasma formation |
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Authors: | P M Mikheev F V Potemkin |
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Institution: | 1.Faculty of Physics,Moscow State University,Moscow,Russia |
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Abstract: | The generation of the third harmonic of femtosecond laser radiation with a wavelength of 1.24 μm tightly focused into the
bulk of fused silica was simulated numerically for the regime with light intensity of 3 × 1013 W/cm2, which is extreme for solid bodies. The efficiency of third harmonic generation (THG) was found to be restricted to 0.1%
in the regime of plasma formation. This is determined by two competitive processes: a decrease of THG efficiency due to an
increase of wave detuning and an increase of THG efficiency due to a growth of focusing asymmetry. In an isotropic medium,
determination of the threshold of plasma formation by use of the third harmonic signal is shown to be a more sensitive method
as compared with the standard scheme of nonlinear transmittance detection. |
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