Mid-Infrared Er3+: ZBLAN Waveguide Using ZBLAN Glass Extrusion, Femto-Second Inscription and Dual-Wavelength Pumping for the Generation of 3.5 µm Lasing. - Ori Henderson-Sapir; Saheed Oladipupo Fashola; Nathaniel Bawden; Alastair Dowler; Alson Ng; David J. Ottaway; Alex Fuerbach; Heike Ebendorff-Heidepriem (ICTON, 2020)