Electron-beam vapour-deposited erbium-doped glass waveguide laser at 1.53 mu m

A single-transverse-mode erbium-doped glass waveguide laser operating at a wavelength of g 1.53 mu m is described. The erbium-doped GeO₂-SiO₂ core of the waveguide was made by electron-beam vapour deposition and patterned by reactive ion etching on a quartz glass substrate. The core was 10 mu m wide, 8 mu m high and 64.5 mm long, which permitted single-transverse-mode laser oscillation. The threshold pump power for CW oscillation was 150 approximately 200 mW at a pumping wavelength of 0.98 mu m.