A single-transverse-mode erbium-doped glass waveguide laser operating at a wavelength of 1.53 μm 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 μm wide, 8 μm high and 64.5 mm long, which permitted single-transverse-mode laser oscillation. The threshold pump power for CW oscillation was 150~200 mW at a pumping wavelength of 0.98 μm.
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Nakazawa et al. (1992) studied this question.