title: Mid-infrared spectral broadening in an ultrafast laser inscribed gallium lanthanum sulphide waveguide.
abstract: We report the successful fabrication of mid-infrared waveguides written in a gallium lanthanum sulphide (GLS) substrate via the ultrafast laser inscription technique. Single mode guiding at 2485 nm and 3850 nm is observed. Spectral broadening spanning 1500 nm (-15dB points) is demonstrated under 3850 nm excitation.
authors.affiliation: Scottish University Physics Alliance, Department of Physics, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, United Kingdom.
authors.forename: John E
authors.initials: JE
authors.lastname: McCarthy
authors.forename: Henry T
authors.initials: HT
authors.lastname: Bookey
authors.forename: Nicholas D
authors.initials: ND
authors.lastname: Psaila
authors.forename: Robert R
authors.initials: RR
authors.lastname: Thomson
authors.forename: Ajoy K
authors.initials: AK
authors.lastname: Kar
mesh_terms: D004867:Equipment Design; D005336:Fiber Optic Technology / Q000295:instrumentation* / Q000379:methods; D005708:Gallium / Q000737:chemistry; D007259:Infrared Rays; D007811:Lanthanum / Q000737:chemistry; D007834:Lasers; D055100:Optical Fibers; D012031:Refractometry / Q000379:methods; D013440:Sulfides / Q000737:chemistry
chemical_list: D013440:Sulfides; D007811:Lanthanum; D005708:Gallium