Photo-thermal modifications in ultrafast laser inscribed chalcogenide glass waveguides

Gayathri Sivakumar, Tamilarasan Sabapathy, Arunbabu Ayiriveetil, Ajoy K. Kar, Sundarrajan Asokan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

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.

Original languageEnglish
Title of host publicationInternational Conference on Optics in Precision Engineering and Nanotechnology 2013
Volume8769
DOIs
Publication statusPublished - 2013
EventInternational Conference on Optics in Precision Engineering and Nanotechnology 2013 - Singapore, Singapore
Duration: 9 Apr 201311 Apr 2013

Publication series

NameProceedings of SPIE
Volume8769
ISSN (Print)0277-786X

Conference

ConferenceInternational Conference on Optics in Precision Engineering and Nanotechnology 2013
Abbreviated titleicOPEN 2013
CountrySingapore
CitySingapore
Period9/04/1311/04/13

Keywords

  • Chalcogenide
  • Heat accumulation
  • Thermal diffusion model
  • Ultrafast laser
  • Waveguide

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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