Photo-induced refractive-index changes in filaments formed in glass with femtosecond laser pulses

Kazuhiro Yamada; Tadamasa Toma; Wataru Watanabe; Junji Nishii; Kazuyoshi Itoh

doi:10.1117/12.405764

6 November 2000 Photo-induced refractive-index changes in filaments formed in glass with femtosecond laser pulses

Kazuhiro Yamada, Tadamasa Toma, Wataru Watanabe, Junji Nishii, Kazuyoshi Itoh

Proceedings Volume 4088, First International Symposium on Laser Precision Microfabrication; (2000) https://doi.org/10.1117/12.405764
Event: First International Symposium on Laser Precision Microfabrication (LPM2000), 2000, Omiya, Saitama, Japan

Abstract

Recently, the structural modifications of glass by focusing femtosecond laser pulses have been demonstrated. We present photo-induced structural changes in silica glass with femtosecond laser pulses. We investigated the relationship between the formation of filaments and local refractive index changes in silica glass. In situ observation revealed the coincidence between the location of filament and that of refractive index change. The observation also showed that the region of refractive index change elongates toward the upstream direction of laser pulses with the exposure time. The region of refractive index change was several hundred- micron long and the diameter was smaller than two microns. The length of the region was dependent on the numerical aperture of focusing lenses. The refractive index change was confirmed to be as large as 0.01 by three different methods. We fabricated a 2-mm waveguide by translating the sample along the optical axis.

Citation Download Citation

Kazuhiro Yamada, Tadamasa Toma, Wataru Watanabe, Junji Nishii, and Kazuyoshi Itoh "Photo-induced refractive-index changes in filaments formed in glass with femtosecond laser pulses", Proc. SPIE 4088, First International Symposium on Laser Precision Microfabrication, (6 November 2000); https://doi.org/10.1117/12.405764

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