Comparative study of UV absorption changes induced in germanosilicate glass by high-intensity femtosecond pulses at 267, 400 and 800 nm |
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| Authors: | Viaceslav Kudriasov Valdas Sirutkaitis David N. Nikogosyan |
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| Affiliation: | a Laser Research Center, Vilnius University, Sauletikio Avenue, 10, Vilnius LT-10222, Lithuania
b Physics Department, University College Cork, Cork, Ireland |
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| Abstract: | We investigated UV absorption changes induced in 3.5 mol% Ge-doped fused silica at high-intensity (∼1011-1013 W/cm2) femtosecond (130 fs) irradiation at 267, 400 and 800 nm. We have shown that the induced spectra in the region 190-300 nm are similar in all three cases. At 800 nm irradiation, in addition to the UV absorption changes, we observed small-scale damage due to self-focusing. This damage appears when the incident pulse fluence value of about 1 J/cm2 (pulse intensity of about 7.5 × 1012 W/cm2) is overcome, while the threshold for the induced absorption changes is twice lower. |
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| Keywords: | 42.70.&minus a 42.70.Ce 42.65.Jx 42.81.&minus i 78.47.+p 82.50.Pt |
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