title: Femtosecond laser direct-writing of waveguide Bragg gratings in a quasi cumulative heating regime.
abstract: Waveguide Bragg gratings (WBGs) were directly inscribed into Alkaline Earth Boro-Aluminosilicate glass samples in a single process step at high fabrication speeds. We utilized a 5.1 MHz femtosecond oscillator to exploit high repetition rate heat accumulation effects. The pulse energy was modulated using a Pockels cell in order to fabricate waveguides that contain a periodic array of nano-structures inside their core. We have demonstrated, for the first time, that the transient build-up of heat accumulation within the sample can lead to the formation of a permanent nano-void. This effect can be exploited to fabricate WBGs at high speeds.
authors: Centre for Ultrahigh bandwidth Devices for Optical Systems (CUDOS), MQPhotonics Research Centre, Department of Physics and Astronomy, Macquarie University, Sydney, NSW 2109, Australia. christopher.miese@mq.edu.au
authors: Christopher
authors: C
authors: Miese
authors: Michael J
authors: MJ
authors: Withford
authors: Alexander
authors: A
authors: Fuerbach
mesh_terms: D003198:Computer Simulation; D004867:Equipment Design; D005898:Glass / Q000737:chemistry* / Q000528:radiation effects; D006358:Hot Temperature; D007834:Lasers; D008027:Light; D008962:Models, Theoretical; D055095:Optics and Photonics / Q000295:instrumentation*; D012542:Scattering, Radiation; D013499:Surface Properties