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26 June 2013Low loss waveguide on chalcogenide glass using ultrafast laser at low repetition rate
1Indian Institute of Science (India) 2Department of Instrumentation and Applied Physics, Indian Institute of Science (India) 3Heriot-Watt Univ. (United Kingdom)
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 μm below the surface of the glass with a separation of 50
μm 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.
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Tamilarasan Sabapathy, Gayathri Sivakumar, Arunbabu Ayiriveetil, Ajoy K. Kar, Sundarrajan Asokan, "Low loss waveguide on chalcogenide glass using ultrafast laser at low repetition rate ," Proc. SPIE 8769, International Conference on Optics in Precision Engineering and Nanotechnology (icOPEN2013), 87693U (26 June 2013); https://doi.org/10.1117/12.2018761