Optimization of glass properties for all solid photonic crystal fibers

We have developed thermally stable borosilicate glass for joint thermal processing with in-house synthesized highly nonlinear lead-bismuth-gallium-silicate glass PBG081. Presented pair of glasses is suitable for fabricating all-solid photonic crystal fibers, with high contrast of refractive index at level of 0.42 at 589.3nm. The difference in thermal expansion coefficients of both glasses is below 3.9·10^-6/K, which allows to fabricate stable structures. A series of borosilicate glasses from the SiO₂-B₂O₃-Al₂O₃-Li₂O-Na₂O-K₂O system was selected and optimized by composition modification to obtain their thermo-mechanical properties similar to that of lead-bismuth-gallium-silicate glass.