Optical and Quantum Electronics

, Volume 42, Issue 14, pp 873–886

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

  • Alexander V. Turchin
  • Mykhaylo Dubov
  • J. A. R. Williams
Article

DOI: 10.1007/s11082-011-9496-1

Cite this article as:
Turchin, A.V., Dubov, M. & Williams, J.A.R. Opt Quant Electron (2011) 42: 873. doi:10.1007/s11082-011-9496-1

Abstract

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.

Keywords

Femtosecond laser micro-fabrication Digital holographic microscopy Born approximation Inverse scattering 

Copyright information

© Springer Science+Business Media, LLC. 2011

Authors and Affiliations

  • Alexander V. Turchin
    • 1
  • Mykhaylo Dubov
    • 2
  • J. A. R. Williams
    • 2
  1. 1.Institute of PhysicsNASUKievUkraine
  2. 2.Photonics Research GroupAston UniversityAston Triangle, BirminghamUK