| Autor: |
Bhardwaj, V. R., Simova, E., Corkum, P. B., Rayner, D. M., Hnatovsky, C., Taylor, R. S., Schreder, B., Kluge, M., Zimmer, J. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 4/15/2005, Vol. 97 Issue 8, p083102, 9p, 2 Black and White Photographs, 5 Graphs |
| Abstrakt: |
We present a comprehensive study on femtosecond laser-induced refractive index modification in a wide variety of multicomponent glasses grouped as borosilicate, aluminum–silicate, and heavy-metal oxide glasses along with lanthanum–borate and sodium–phosphate glasses. By using high-spatial resolution refractive index profiling techniques, we demonstrate that under a wide range of writing conditions the refractive index modification in multicomponent glasses can be positive, negative, or nonuniform, and exhibits a strong dependence on the glass composition. With the exception of some aluminum–silicate glasses all other glasses exhibited a negative/nonuniform index change. We also demonstrate direct writing of waveguides in photosensitive Foturan® glass with a femtosecond laser without initiating crystallization by thermal treatment. Upon ceramization of lithium–aluminum–silicate glasses such as Foturan®, Zerodur®, and Robax® we observe switching of laser-induced refractive index change from being positive to negative. The measured transmission losses in the waveguides at 1550 nm agree with the index profile measurements in alkali-free aluminum–silicate glasses. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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