3D Reconstruction of the complex dielectric function of glass during femtosecond laser micro-fabrication


We report on a new technique to reconstruct the 3D dielectric function change in transparent dielectric materials and the application of the technique for on-line monitoring of refractive index modification in BK7 glass during direct femtosecond laser microfabrication. The complex optical field scattered from the modified region is measured using two-beam, single-shot interferogram and the distribution of the modified refractive index is reconstructed by numerically solving the inverse scattering problem in Born approximation. The optical configuration suggested is further development of digital holographic microscopy (DHM). It takes advantage of high spatial resolution and almost the same optical paths for both interfering beams, and allows ultrafast time resolution.

Additional Information: The paper presents results reported at OWTNM-2010 conference. The original publication is available at www.springerlink.com
Uncontrolled Keywords: 3D dielectric function change, transparent dielectric materials, on-line monitoring, refractive index modification, BK7 glass, direct femtosecond laser microfabrication
Publication ISSN: 0306-8919
Last Modified: 23 Oct 2019 11:15
Date Deposited: 08 Dec 2010 13:02
Published Date: 2011-12
Authors: Turchin, Alexander
Dubov, Mykhaylo
Williams, John A.R.


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