HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Ultra-short laser-induced high aspect ratio densification in porous glass

Abstract : Multiple ultra-short laser irradiation enabling direct writing of high aspect ratio barriers is used for structuring of nanoporous glass. Shape and morphology of laser-modified regions are examined, and high aspect ratio laser-induced material densification is founded. Experimental results are analyzed by modeling describing laser propagation, non-linear ionization and thermal effects. The role of laser focusing, laser energy and pulse number are examined. Several regimes are distinguished. Particularly, high-aspect ratio densified zones are obtained for the numerical aperture of 0.25, whereas either more symmetric densified regions or spherical cavities are shown to be formed for numerical aperture of 0.4. The resulting laser irradiation conditions required for deep and prolonged densification are explained by a lower ionization rate, leading to the under-critical free electron plasma density, longer filamentation and pulse-to-pulse elongation effects. Furthermore, filling of the porous glass with water is demonstrated to particularly extend the length of the densified region in depth. The presented study provides insights facilitating laser-based fabrication of barriers, membrane and patterns suitable for the environmental gas-phase analysis.
Complete list of metadata

Cited literature [44 references]  Display  Hide  Download

Contributor : Tatiana Itina Connect in order to contact the contributor
Submitted on : Monday, October 28, 2019 - 6:01:56 PM
Last modification on : Monday, January 13, 2020 - 5:46:07 PM
Long-term archiving on: : Wednesday, January 29, 2020 - 7:41:15 PM


Explicit agreement for this submission



Tatiana Itina, Roman Zakoldaev, Maxim Sergeev, Hongfeng Ma, Sergey Kudryashov, et al.. Ultra-short laser-induced high aspect ratio densification in porous glass. Optical Materials Express, OSA pub, 2019, 9 (11), pp.4379. ⟨10.1364/OME.9.004379⟩. ⟨ujm-02336395⟩



Record views


Files downloads