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- Title
3D reconstruction of the complex dielectric function of glass during femtosecond laser micro-fabrication.
- Authors
Turchin, Alexander; Dubov, Mykhaylo; Williams, J.
- 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.
- Subjects
MICROFABRICATION; FEMTOSECOND lasers; BORN approximation; INVERSE scattering transform; OPTICAL properties of dielectrics; OPTICAL properties of transparent solids; REFRACTIVE index; GLASS
- Publication
Optical & Quantum Electronics, 2011, Vol 42, Issue 14/15, p873
- ISSN
0306-8919
- Publication type
Article
- DOI
10.1007/s11082-011-9496-1