@inproceedings{80efe54f92bc4c35b53d1814a65a8782,
title = "Photo-thermal modifications in ultrafast laser inscribed chalcogenide glass waveguides",
abstract = "We report here, a finite difference thermal diffusion (FDTD) model for controlling the cross-section and the guiding nature of the buried channel waveguides fabricated on GeGaS bulk glasses using the direct laser writing technique. Optimization of the laser parameters for guiding at wavelength 1550 nm is done experimentally and compared with the theoretical values estimated by FDTD model. The mode field diameter (MFD) between 5.294 μm and 24.706 μm were attained by suitable selection of writing speed (1mm/s to 4 mm/s) and pulse energy (623 nJ to 806 nJ) of the laser at a fixed repletion rate of 100 kHz. Transition from single-mode to multi-mode waveguide is observed at pulse energy 806nJ as a consequence of heat accumulation. The thermal diffusion model fits well for single-mode waveguides with the exception of multi-mode waveguides.",
keywords = "Chalcogenide, Heat accumulation, Thermal diffusion model, Ultrafast laser, Waveguide",
author = "Gayathri Sivakumar and Tamilarasan Sabapathy and Arunbabu Ayiriveetil and Kar, {Ajoy K.} and Sundarrajan Asokan",
year = "2013",
doi = "10.1117/12.2018943",
language = "English",
isbn = "9780819495679",
volume = "8769",
series = "Proceedings of SPIE",
booktitle = "International Conference on Optics in Precision Engineering and Nanotechnology 2013",
note = "International Conference on Optics in Precision Engineering and Nanotechnology 2013, icOPEN 2013 ; Conference date: 09-04-2013 Through 11-04-2013",
}