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21 February 2005 Bulk modification and damage in fused silica induced by femtosecond pulses
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We report experimental observation of modification and damage in bulk of fused silica induced by intense multiple femtosecond pulses. At power levels several times exceeding critical power for self-focusing the modification is in the form of some permanent changes inside the material and these effects are closely correlated with the beam filamentation process. Longer distances of propagation and much higher pulse energies produce bulk damage in the form of scattering zones. The formation of damage in anti-reflective-coated fused silica windows is also reported. Numerical simulations involving self-focusing, multiphoton absorption and permanent change of the refractive index of the bulk material were found to be in agreement with the experimental results.
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Viaceslav Kudriasov, Eugenijus Gaizauskas, Rimantas Grigonis, and Valdas Sirutkaitis "Bulk modification and damage in fused silica induced by femtosecond pulses", Proc. SPIE 5647, Laser-Induced Damage in Optical Materials: 2004, (21 February 2005);

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