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Opt Express. 2008 Nov 24;16(24):20081-98.

Femtosecond laser photo-response of Ge23Sb7S70 films.

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  • 1College of Optics/CREOL, University of Central Florida, 4000 Central Florida Blvd., Orlando, FL 32816, USA. troy@creol.ucf.edu

Abstract

Ternary chalcogenide glass films from identical parent bulk glasses were prepared by thermal evaporation (TE) and pulsed laser deposition (PLD) and subjected to 810-nm femtosecond laser exposure at both kHz and MHz repetition rates. The exposure-induced modification on the glass film's surface profile, refractive index, and structural properties were shown to be a function of laser irradiance, the number of laser pulses per focal spot, and repetition rate. Film response was shown to be related to deposition technique-related density and the number of glass bonds within the irradiated focal volume. The induced changes resulted from a reduction in glass network connectivity among GeS(4/2), GeS(4), S-S and S(3)Ge-S-GeS(3) units.

PMID:
19030094
[PubMed]
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