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Modeling the Femtosecond Pulse Interaction with Fused Silica

Author(s):

Supriya Rai , Lovely Professional University

Keywords:

Fused Silica, Femtosecond Pulse

Abstract

An explicit model of physics behind laser breakdown of fused silica by femtosecond laser pulses is developed. When the ultra short laser pulse propagates for time interval shorter than time required for heat conduction, diffusion, electron to lattice energy transfer and other relaxation processes, ergo interaction is spatially localized. Multi-photon absorption and tunneling of electrons from valence band to conduction band are the two competing mechanisms for swift production of electron hole pairs, supplemented by Joule heating and avalanche ionization. The rapid rise in free carrier density in the interaction zone subsequently influences refractive index, modifying the phase of the laser and causing frequency shift. This model is best fit for higher frequencies of the order 1017 W/cm2 under the application of WKB and SEWA approximation.

Other Details

Paper ID: IJSRDV3I70479
Published in: Volume : 3, Issue : 7
Publication Date: 01/10/2015
Page(s): 780-783

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