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Birefringent elements based on femtosecond laser-induced nanogratings

 
: Ramirez, L.P.; Heinrich, M.; Richter, S.; Dreisow, F.; Keil, R.; Korovin, A.V.; Peschel, U.; Nolte, S.; Tünnermann, A.

:

Heisterkamp, A.; Joseph Neev; Stefan Nolte; Rick P. Trebino ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Frontiers in ultrafast optics: biomedical, scientific, and industrial applications X : 24 - 26 January 2010, San Francisco, California, United States; SPIE Photonics West
Bellingham, WA: SPIE, 2010 (Proceedings of SPIE 7589)
ISBN: 978-0-8194-7985-3
Paper 758919
Conference "Frontiers in Ultrafast Optics - Biomedical, Scientific, and Industrial Applications" <10, 2010, San Francisco/Calif.>
Photonics West Conference <2010, San Franciso/Calif.>
English
Conference Paper
Fraunhofer IOF ()
birefringence; laser material processing; nanophotonic

Abstract
We report on the fabrication of birefringent optical components based on so-called nanogratings. These selforganized nanostructures with sub-wavelength periodicity are formed during femtosecond laser processing of transparent materials, resulting in characteristic birefringent modifications. Nanogratings provide the means for the direct inscription of customized birefringent elements with position-dependent retardation. We present our investigations on the formation process of nanogratings in fused silica and the influence of fabrication parameters, thereby identifying ways to systematically control the structural properties of the gratings. Consequently, we were able to fabricate nanograting-based birefringent elements with specific retardations in bulk fused silica.

: http://publica.fraunhofer.de/documents/N-139030.html