Abstract
We report an Yb/Al-codoped fused silica planar waveguide amplifier with <0.2dB/cm passive loss and 0.6dB/cm gain, featuring a high damage threshold (>0.1GW/cm2) and a relatively large core (20μm thick). Waveguide fabrication is based on a novel silica-on-silica technology combining modified-chemical-vapor deposition and a high temperature CO2 laser treatment for making high-power photonic devices.
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