Investigation and Control of Ultrafast Laser-Induced Nanoscale Patterns in Bulk Fused Silica
Laboratoire Hubert Curien, UMR 5516 CNRS, Université de Lyon, Université Jean Monnet, 42000, Saint Etienne, France
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Refractive index changes in a-SiO2 consist of positive index variations or regular nanoscale patterns. We spectroscopically reveal the electronic and structural transformation of glass in the self-organized structures, indicating bond breaking and oxygen deficiency. We equally propose a method of real time control of nanogratings formation under the action of ultra -short laser pulse with variable envelopes. Application as polarizing optical devices is discussed.
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