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

Alexander Turchin, Mykhaylo Dubov*, John A.R. Williams

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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. It takes advantage of high spatial resolution and almost the same optical paths for both interfering beams, and allows ultrafast time resolution. © Springer Science+Business Media, LLC. 2011.

Original languageEnglish
Pages (from-to)873-886
Number of pages14
JournalOptical and Quantum Electronics
Issue number14-15
Publication statusPublished - Dec 2011

Bibliographical note

The paper presents results reported at OWTNM-2010 conference. The original publication is available at www.springerlink.com


  • born approximation
  • digital holographic microscopy
  • femtosecond laser micro-fabrication
  • lnverse scattering


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