Fabrication of Internal Diffraction Gratings in Planar Fluoride Glass Using Low-density Plasma Formation Induced by a Femtosecond Laser
- Authors
- Cho, Sunghak; Chang, Wonseok; Kim, Jae-goo; Kim, Kwangryul; Hong, Jong Wook
- Issue Date
- Dec-2008
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Diffraction grating; Femtosecond laser; Fluoride glass plate; Plasma formation; Refractive index modification
- Citation
- APPLIED SURFACE SCIENCE, v.255, no.5, part1, pp.2069 - 2074
- Indexed
- SCOPUS
- Journal Title
- APPLIED SURFACE SCIENCE
- Volume
- 255
- Number
- 5, part1
- Start Page
- 2069
- End Page
- 2074
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/42283
- DOI
- 10.1016/j.apsusc.2008.06.186
- ISSN
- 0169-4332
- Abstract
- The fabrication of internal diffraction gratings with photo-induced refractive index modification in planar fluoride plates was demonstrated using low-density plasma formation excited by a high-intensity femtosecond (130 fs) Ti:sapphire laser (λ p = 790 nm). The refractive index modifications with diameters ranging from 350 nm to 5 μm were photoinduced after plasma formation occurred upon irradiation with peak intensities of more than 1 × 10 12 W/cm 2 . The graded refractive index profile was fabricated to be a symmetric around from the center of the point at which low-density plasma occurred. The maximum refractive index change (Δn) was estimated to be 1.3 × 10 -2 . The low-density plasma formation (n c < 1.79 × 10 27 m -3 ]) causes the increase of the refractive index modification with fluoride glass. © 2008 Elsevier B.V. All rights reserved.
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