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Low loss waveguide on chalcogenide glass using ultrafast laser at low repetition rate

Sabapathy, Tamilarasan and Sivakumar, Gayathri and Ayiriveetil, Arunbabu and Kar, Ajoy K and Asokan, Sundarrajan (2013) Low loss waveguide on chalcogenide glass using ultrafast laser at low repetition rate. In: 2nd Conference of the Optics-and-Photonics-Society-of-Singapore / International Conference on Optics in Precision Engineering and Nanotechnology (icOPEN), APR 09-11, 2013, Singapore, SINGAPORE.

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Official URL: http://dx.doi.org/10.1117/12.2018761


In this work, we synthesized bulk amorphous GeGaS glass by conventional melt quenching technique. Amorphous nature of the glass is confirmed using X-ray diffraction. We fabricated the channel waveguides on this glass using the ultrafast laser inscription technique. The waveguides are written on this glass 100 mu m below the surface of the glass with a separation of 50 ae m by focusing the laser beam into the material using 0.67 NA lens. The laser parameters are set to 350 fs pulse duration at 100 KHz repetition rate. A range of writing energies with translation speeds 1 mm/s, 2 mm/s, 3 mm/s and 4 mm/s were investigated. After fabrication the waveguides facets were ground and polished to the optical quality to remove any tapering of the waveguide close to the edges. We characterized the loss measurement by butt coupling method and the mode field image of the waveguides has been captured to compare with the mode field image of fibers. Also we compared the asymmetry in the shape of the waveguide and its photo structural change using Raman spectra.

Item Type: Conference Paper
Series.: Proceedings of SPIE
Publisher: SPIE-International Society for Optical Engineering
Additional Information: Copyright of this article belongs to SPIE-International Society for Optical Engineering.
Keywords: Chalcogenide Glasses; Photonics Integrated Circuits
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited: 22 Oct 2013 12:13
Last Modified: 22 Oct 2013 12:13
URI: http://eprints.iisc.ac.in/id/eprint/47556

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