Journal
OPTICS EXPRESS
Volume 25, Issue 7, Pages 8011-8021Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.008011
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Funding
- Engineering and Physical Sciences Research Council (EPSRC) [EP/M029042/1]
- Ministry of Education and Science of Russia [14.Z50.31.0009]
- EPSRC [EP/M029042/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [1580828] Funding Source: researchfish
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We compare a femtosecond laser induced modification in silica matrices with three different degrees of porosity. In single pulse regime, the decrease of substrate density from fused silica to high-silica porous glass and to silica aerogel glass results in tenfold increase of laser affected region with the formation of a symmetric cavity surrounded by the compressed silica shell with pearl like structures. In multi-pulse regime, if the cavity produced by the first pulse is relatively large, the subsequent pulses do not cause further modifications. If not, the transition from void to the anisotropic structure with the optical axis oriented parallel to the incident polarization is observed. The maximum retardance value achieved in porous glass is twofold higher than in fused silica, and tenfold greater than in aerogel. The polarization sensitive structuring in porous glass by two pulses of ultrafast laser irradiation is demonstrated, as well as no observable stress is generated at any conditions.(C) 2017 Optical Society of America
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