A dot pattern of a refractive-index change was formed by spot heating with laser-beam irradiation on sodium tellurite glasses. The 15Na<sub>2</sub>O · 85TeO<sub>2</sub> (mol. %) glass doped with 2 mol. % of CoO was irradiated by a green light-beam spot (532 nm) ~800 μm in diameter from the second-harmonic generator of a Q-switched pulsed YAG laser. The map of the refractive index of the glass was determined with an He–Ne laser beam by a scanning ellipsometric technique at a resolution of 100 μm × 50 μm, indicating that the spots possessing a refractive index lower by ~0.05 were formed at the region irradiated by the laser beam.
© 1998 Optical Society of America
(120.5710) Instrumentation, measurement, and metrology : Refraction
(140.3300) Lasers and laser optics : Laser beam shaping
(160.2750) Materials : Glass and other amorphous materials
(330.5000) Vision, color, and visual optics : Vision - patterns and recognition
Satoru Inoue, Akihiko Nukui, Kazuhiro Yamamoto, Tetsuji Yano, Shuichi Shibata, Masayuki Yamane, and Tomoharu Maeseto, "Refractive-Index Patterning of Tellurite Glass Surfaces by Laser Spot Heating," Appl. Opt. 37, 48-53 (1998)