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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/213599
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- Time-resolved axial-view of the dielectric breakdown under tight focusing in glass
- Hayasaki, Yoshio; Iwata, Keisuke; Hasegawa, Satoshi; Takita, Akihiro; Juodkazis, Saulius
- We present time-resolved studies of the dielectric breakdown using tightly focused femtosecond (fs) laser pulses in glass. Axial evolution of the breakdown and material modifications have been retrieved over the time span from 0 to 1 ns with a 50 fs resolution and ∼ 1 μm spatial resolution using interferometric pump-probe technique. It is shown that even at pulse power slightly above critical Pcr ≃ 1 MW/pulse, the filamentation was limited at tight focusing and the central focal region with resolidified glass was localised axially within ∼ 10 μm; it can be used for the waveguide recording. Mechanisms of light-matter interaction at tight focusing and application potential are discussed. The electron-ion scattering time, τe–i ≃ 1.1 fs, for the glass at electron concentration ne ≃ (4–5)×1020 cm−3 was determined within Drude approximation.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Micro-Photonics
- Optical Materials Express, Vol. 1, no. 8 (Dec 2011), pp. 1399-1408
- Publication year
- Axial evolution; Dielectric breakdown; Femtosecond laser pulses; Glass; Time
- Optical Society of America
- Publisher URL
- Copyright © 2011 OSA. Published version of the paper reproduced here in accordance with the copyright policy of the publisher. This paper was published in Optical Materials Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://dx.doi.org/10.1364/OME.1.001399. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
- Additional information
- The authors acknowledge support from a Grant-in-Aid for Scientific Research (B) from the Ministry of Education, Culture, Sports, Science and Technology of Japan.
- Full text
- Peer reviewed