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Proceedings Paper

Photoionization of wide bandgap silicate glasses by ultrashort IR laser pulses
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Paper Abstract

We study the excitation of luminescence, photoionization, and laser-induced breakdown in a multi-component silicate photo-thermo-refractive (PTR) glass, and in fused silica. PTR glass is a high-purity homogeneous photosensitive alkalisilicate glass with intrinsic absorption edge at 5.8 eV (214 nm). Experiments are conducted with ultrashort laser pulses (100 fsec< τ < 1.5 psec) at the wavelengths 780 nm, 1430 nm, and 1550 nm. Filaments are observed inside both glasses and explained by a balance between Kerr self-focusing and free electron defocusing. Keldysh theory is used to model the formation of filaments and values of about 1013 W/cm2 for laser intensity and 1019 cm-3 for free-electron density are estimated. Laser-induced damage by pulses at 1430 nm and 1550 nm is detected in fused silica and PTR glass by third harmonic generation due to the formation of an interface between a damage site and the surrounding glass matrix. It is found that there is an intensity range where luminescence and photoionization in both glasses occurs without laserinduced damage.

Paper Details

Date Published: 30 December 2008
PDF: 10 pages
Proc. SPIE 7132, Laser-Induced Damage in Optical Materials: 2008, 713205 (30 December 2008); doi: 10.1117/12.804984
Show Author Affiliations
Leo A. Siiman, College of Optics and Photonics, Univ. of Central Florida (United States)
Julien Lumeau, College of Optics and Photonics, Univ. of Central Florida (United States)
Leonid B. Glebov, College of Optics and Photonics, Univ. of Central Florida (United States)

Published in SPIE Proceedings Vol. 7132:
Laser-Induced Damage in Optical Materials: 2008
Gregory J. Exarhos; Detlev Ristau; M. J. Soileau; Christopher J. Stolz, Editor(s)

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