Journal of the Ceramic Society of Japan
Online ISSN : 1882-1022
Print ISSN : 0914-5400
Technical reports
Refractive Index Reduction at the Surface of Co/Cu-Doped Silicate Glasses Induced by Femto-Second Laser Irradiation
Shin-ichi TODOROKIMotoki MURAOKAShigeru SUEHARATomoya KONISHISatoru INOUEAtsuo YASUMORI
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2005 Volume 113 Issue 1316 Pages 308-311

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Abstract

Femto-second laser pulses (800 nm, 11 nJ/pulse, 82 MHz) were irradiated on the surface of Co- or Cu-doped silicate glasses (70SiO2•20NaO2•10Al2O3 doped with 20 mol% of CoO or CuO, respectively) for 1 s to modify its surface, which was observed by a scanning probe microscope and an ellipsometer. Some samples exhibited refractive index reduction without any structural modification, which was brought about by local increase in fictive temperature through spot heating and quenching. With the aid of a computer simulation using a finite element method, such a modification is found to occur when the maximum surface temperature is less than 1000°C for the Cu-doped glass.

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© 2005 The Ceramic Society of Japan
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