A method of waveguide fabrication in the volume of a porous glass plate pre-matured at air humidity of 60-80% for 72-96 hours has been developed. A beam of laser radiation with a power density of 15-25 kW/cm2, focused to a depth equal to 1/4 of the thickness, is moved at a speed of 3-20 µm/s repeatedly until the waveguide is formed. The waveguide plate is then heat treated at a temperature of 870-890°C for 10-20 minutes, with the waveguide plate heated to a temperature of 140°C at a rate of 5°C/min.
DEVELOPMENT ADVANTAGES
Increasing the difference in refractive index between core and shell. Reduced loss of optical signal transmitted through the waveguide.
CHARACTERISTICS
The waveguide is recorded with a laser intensity of 15-25 KW/cm².