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Proceedings Paper

Laser-induced sub-surface modification of the optical properties in transparent materials: nik-engineering (TM)
Author(s): David Ashkenasi; Hans-Juergen Hoffmann; Gerhard J. Mueller
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Paper Abstract

A new field in laser processing is opened by the method of modifying the optical properties, i.e. the refractive index, absorption- and scattering-coefficient, at minimal mechanical stress inside the material. Focusing ultra short laser pulses inside the transparent media allows to control and modify their optical properties. This is referred to as nik-engineering (TM), relating the technique to changes of the complex refractive index, i.e. (n+ik). Three dimensional patterns of the (n + ik) modifications can be achieved in the subsurface region even on a microscopic scale. New results in nik-engineering obtained in our application laboratory are presented using different optical materials. The results in laser nik-engineering of photo-chromic glass using ultra short laser pulses at a wavelength of 800 nm is presented. A model in respect to the relevant processes leading to the observed laser-induced modifications in the optical properties of photo-chromic glass is presented. We discuss the results and the commercial potential of nik-engineering.

Paper Details

Date Published: 18 November 2003
PDF: 6 pages
Proc. SPIE 5063, Fourth International Symposium on Laser Precision Microfabrication, (18 November 2003); doi: 10.1117/12.540695
Show Author Affiliations
David Ashkenasi, Laser- und Medizin-Technologie GmbH (Germany)
Hans-Juergen Hoffmann, Technische Univ. Berlin (Germany)
Gerhard J. Mueller, Freie Univ. Berlin (Germany)

Published in SPIE Proceedings Vol. 5063:
Fourth International Symposium on Laser Precision Microfabrication
Isamu Miyamoto; Andreas Ostendorf; Koji Sugioka; Henry Helvajian, Editor(s)

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