18 November 2003 Laser-induced sub-surface modification of the optical properties in transparent materials: nik-engineering (TM)
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Proceedings Volume 5063, Fourth International Symposium on Laser Precision Microfabrication; (2003) https://doi.org/10.1117/12.540695
Event: Fourth International Symposium on Laser Precision Microfabrication, 2003, Munich, Germany
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.
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David Ashkenasi, David Ashkenasi, Hans-Juergen Hoffmann, Hans-Juergen Hoffmann, Gerhard J. Mueller, Gerhard J. Mueller, } "Laser-induced sub-surface modification of the optical properties in transparent materials: nik-engineering (TM)", Proc. SPIE 5063, Fourth International Symposium on Laser Precision Microfabrication, (18 November 2003); doi: 10.1117/12.540695; https://doi.org/10.1117/12.540695
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