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Femtosecond laser-i...
Femtosecond laser-induced transformations in ultra-low expansion glass : Microstructure and local density variations by vibrational spectroscopy
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- Efthimiopoulos, I. (författare)
- Natl Hellen Res Fdn, Greece;Deutsch GeoForschungsZentrum GFZ, Germany
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- Palles, D. (författare)
- Natl Hellen Res Fdn, Greece
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- Richter, S. (författare)
- Friedrich Schiller Univ Jena, Germany;TRUMPF Lasertech GmbH, Germany
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- Hoppe, U. (författare)
- Univ Rostock, Germany
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- Möncke, Doris (författare)
- Linnéuniversitetet,Institutionen för byggd miljö och energiteknik (BET),Natl Hellen Res Fdn, Greece
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- Wondraczek, L. (författare)
- Friedrich Schiller Univ Jena, Germany;Fraunhofer Inst Appl Opt & Precis Engn, Germany
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- Nolte, S. (författare)
- Friedrich Schiller Univ Jena, Germany;Fraunhofer Inst Appl Opt & Precis Engn, Germany
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- Kamitsos, E. I. (författare)
- Natl Hellen Res Fdn, Greece
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(creator_code:org_t)
- American Institute of Physics (AIP), 2018
- 2018
- Engelska.
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Ingår i: Journal of Applied Physics. - : American Institute of Physics (AIP). - 0021-8979 .- 1089-7550. ; 123:23
- Relaterad länk:
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https://bib-pubdb1.d...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We report X-ray diffraction, resonance Raman, and infrared (IR) results on pristine ultra-low expansion (ULE) glass, a binary titanosilicate glass with 5.67 mol. % TiO2. ULE processing by femtosecond (fs) laser radiation leads to nanograting writing and photo-darkening for imaging and data storage. We investigate here the vibrational/structural changes induced by fs laser irradiation of ULE at 515 nm. Optical imaging revealed the formation of micro-cavities, and Raman mapping showed molecular oxygen trapped in such cavities of laser-irradiated ULE glass. While titanium in the pristine glass was found predominantly in tetrahedral Ti4+ sites highly dispersed in the silicate matrix, Raman and IR reflectance spectroscopy on laser-irradiated ULE indicated the formation of Ti3+ sites; Ti3+ octahedral sites are formed in the shells of cavities and aggregate in amorphous Ti2O3-type clusters, while the glass around and below cavities contains Ti3+ tetrahedral sites dispersed in the silicate network. Laser-processed ULE glass was found to also exhibit local restructuring of the silicate matrix. Shifts of the strong IR band at about 1080-1100 cm(-1) were translated into changes of the average Si-O-Si bond angle in the laser-transformed areas and found to reflect local density variations; the average local density increases relative to silica glass up to about 8% in the shells of micro-cavities and decreases by about 0.5% in the surrounding material. Chemical processes were proposed to account for photo-darkening and the local structural transformation effect in the probed areas of the fs laser-processed ULE glasses. Published by AIP Publishing.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Samhällsbyggnadsteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Civil Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering (hsv//eng)
Nyckelord
- Glasteknologi
- Glass Technology
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- art (ämneskategori)
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