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Proceedings Paper

Interactions of carriers, phonons, and point defects during direct femtosecond laser writing of waveguides in bulk dielectrics
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Paper Abstract

Phenomenological model of photo-elastic effect in bulk dielectrics damaged by femtosecond laser radiation in the regime of direct laser-writing of waveguides is proposed. Positive and negative changes of refraction index due to densification and stretching in laser-written damage tracks inside silica glasses and fluorite, respectively, are explained in terms of laser-induced point defect generation. This model predicts spatial narrowing or broadening of such tracks in silica glass and fluorite bulk samples, respectively, related to spatial point defect distribution due to interactions of carriers with long-wavelength optical and acoustic vibrations as well as due to interactions of point defects with longwavelength acoustic vibrations. Direct laser writing of perspective different contrast microstructures with lower-index boundaries in fluorite and other dielectrics is discussed.

Paper Details

Date Published: 21 February 2005
PDF: 11 pages
Proc. SPIE 5647, Laser-Induced Damage in Optical Materials: 2004, (21 February 2005); doi: 10.1117/12.585128
Show Author Affiliations
Sergey I. Kudryashov, Arkansas State Univ. (United States)

Published in SPIE Proceedings Vol. 5647:
Laser-Induced Damage in Optical Materials: 2004
Gregory J. Exarhos; Arthur H. Guenther; Norbert Kaiser; Keith L. Lewis; M. J. Soileau; Christopher J. Stolz, Editor(s)

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