Low-loss Na-glass waveguides

A new method for the fabrication of low-loss Na-glass waveguides on SiO2has been found. The reglassification process has enabled us to reduce the scattering loss in the planar waveguide to less than 1 dB/cm and to obtain channel waveguide with 2 dB/cm attenuation by the lift-off method or by the direct laser writing method.