title: Large-mode-area infrared guiding in ultrafast laser written waveguides in sulfur-based chalcogenide glasses.
abstract: Current demands in astrophotonics impose advancing optical functions in infrared domains within embedded refractive index designs. We demonstrate concepts for large-mode-area guiding in ultrafast laser photowritten waveguides in bulk Sulfur-based chalcogenide glasses. If positive index contrasts are weak in As2S3, Ge doping increases the matrix rigidity and allows for high contrast (10(-3)) positive refractive index changes. Guiding with variable mode diameter and large-mode-area light transport is demonstrated up to 10 μm spectral domain using transverse slit-shaped and evanescently-coupled multicore traces.
authors.forename: C
authors.initials: C
authors.lastname: D'Amico
authors.forename: G
authors.initials: G
authors.lastname: Cheng
authors.forename: C
authors.initials: C
authors.lastname: Mauclair
authors.forename: J
authors.initials: J
authors.lastname: Troles
authors.forename: L
authors.initials: L
authors.lastname: Calvez
authors.forename: V
authors.initials: V
authors.lastname: Nazabal
authors.forename: C
authors.initials: C
authors.lastname: Caillaud
authors.forename: G
authors.initials: G
authors.lastname: Martin
authors.forename: B
authors.initials: B
authors.lastname: Arezki
authors.forename: E
authors.initials: E
authors.lastname: LeCoarer
authors.forename: P
authors.initials: P
authors.lastname: Kern
authors.forename: R
authors.initials: R
authors.lastname: Stoian