We have performed high repetition rate femtosecond laser bulk modification of TiO2-SiO2based glass (Schott N-SF8 glass), leading to a decrease in the refractive index near the focal volume. From μRaman and X-ray microanalysis we have associated the decrease in the refractive index to a volume expansion due to glass network modifications induced by the laser irradiation. By writing two lines close together we have been able to confine the optical mode and obtain propagation losses of 0.7 dB/cm in the near infrared.

Raman spectroscopy of femtosecond laser written low propagation loss optical waveguides in Schott N-SF8 glass

Sotillo, B.;CHIAPPINI, ATTILIO;Bharadwaj, V.;Ramponi, R.;Eaton, S. M.
2017

Abstract

We have performed high repetition rate femtosecond laser bulk modification of TiO2-SiO2based glass (Schott N-SF8 glass), leading to a decrease in the refractive index near the focal volume. From μRaman and X-ray microanalysis we have associated the decrease in the refractive index to a volume expansion due to glass network modifications induced by the laser irradiation. By writing two lines close together we have been able to confine the optical mode and obtain propagation losses of 0.7 dB/cm in the near infrared.
OPTICAL MATERIALS
Glass waveguides; Raman spectroscopy; Ultrafast lasers; Electronic, Optical and Magnetic Materials; Computer Science (all); Atomic and Molecular Physics, and Optics; Electrical and Electronic Engineering
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/1045544
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