Mid-infrared photonics enabled by 3D laser writing chalcogenide glass

A. Rodenas*, J. McCarthy, N. D. Psaila, G. Brown, H. T. Bookey, R. R. Thomson, A. K. Kar

*Corresponding author for this work

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

3 Citations (Scopus)


Recent results from our work using ultrafast laser writing to fabricate waveguides and on-chip devices inside sulphide chalcogenide glasses are presented in this paper. Low loss single-mode (SM) and multi-mode (MM) waveguide arrays were successfully laser fabricated, for the first time to our knowledge, for operation in the whole near-IR (NIR) to mid-IR (MIR) range (1 to 11 mu m wavelengths). These waveguides are demonstrated to have numerical apertures (NA) which can exceed NA=0.2, therefore also allowing for low bend losses as well as direct coupling to QC lasers. We also demonstrate the control over the waveguide mode field diameters (MFDs) (at 1/e(2)) by changing the waveguide core sizes and index contrasts, achieving typical values of 44 mu m at 10.6 mu m, down to 6 mu m for telecom 1.55 mu m light. The optical nonlinear properties of these waveguides have also been preliminarily investigated. Using a femtosecond (fs) optical parametric amplifier system, the optical nonlinearity of bulk gallium lanthanum sulphide (GLS) glass was first measured at 2.5 mu m. The upper limits for the nonlinear properties of the laser modified material could be estimated based upon the nonlinear spectral broadening of a 2.5 mu m fs pulse train coupled into SM waveguides. Further work includes the demonstration of on-chip three dimensional (3D) beam combiners for the MIR range (10.6 mu m in this work), for near future implementation in astronomical observatories for stellar interferometry.

Original languageEnglish
Title of host publicationProceedings of SPIE
Subtitle of host publicationElectro-Optical Remote Sensing, Photonic Technologies, And Applications VI
EditorsGW Kamerman, O Steinvall, GJ Bishop, J Gonglewski, KL Lewis, RC Hollins, TJ Merlet, MT Gruneisen, M Dusek, JG Rarity
Place of PublicationBellingham
Number of pages11
ISBN (Print)978-0819492838
Publication statusPublished - 2012
EventConference on Electro-Optical Remote Sensing, Photonic Technologies, and Applications VI - Edinburgh, United Kingdom
Duration: 24 Sept 201226 Sept 2012

Publication series

NameProceedings of SPIE
ISSN (Print)1996-756X
ISSN (Electronic)0277-786X


ConferenceConference on Electro-Optical Remote Sensing, Photonic Technologies, and Applications VI
Country/TerritoryUnited Kingdom


  • index
  • Chalcogenide
  • laser processing
  • femtosecond laser
  • infrared
  • written wave-guides
  • films
  • supercontinuum generation
  • fiber


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