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Photo-thermal modifications in ultrafast laser inscribed chalcogenide glass waveguides

Sivakumar, Gayathri and Sabapathy, Tamilarasan and Ayiriveetil, Arunbabu and Kar, Ajoy K and Asokan, Sundarrajan (2013) Photo-thermal modifications in ultrafast laser inscribed chalcogenide glass waveguides. 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/10.1117/12.2018943

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 mu m and 24.706 mu m 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.

Item Type: Conference Paper
Additional Information: Copyright of this article belongs to SPIE-International Society for Optical Engineering.
Keywords: chalcogenide; Ultrafast Laser; Waveguide; Heat Accumulation; Thermal Diffusion Model
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Depositing User: Francis Jayakanth
Date Deposited: 22 Oct 2013 12:14
Last Modified: 22 Oct 2013 12:14
URI: http://eprints.iisc.ac.in/id/eprint/47559

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