Uv Transparent High Homogeneity Silica Glass Produced By Flame Aerosol Vad Synthesis

The effects of flame aerosol VAD processing parameters, such as H 2/O2 ratio, burnertarget distance, SiCl4 gas flux, and the shape of soot preform deposition surface were correlated to the homogeneity of refractive index of post-consolidated silica perform. Interferometry and optical spectrometry techniques were used to determine the refractive index distribution, and the hydroxyl concentration was obtained through Raman spectroscopy. It was concluded that the high radial homogeneity of the refractive index is obtained with flat deposition surface profiles deposited by setting H2/O2 ratio >2.0, burner-target distance <45 mm, and SiCl4 flux ≥ 2.8×10-6 m3/s.Ikushima, A.J., Fujiwara, T., Saito, K., Silica glass: A material for photonics (2000) Journal of Applied Physics, 88, pp. 1201-1213Otsuka, H., Shirota, K., Fujinoki, A., Nishimura, H., Shimakawa, T., (2004) Synthetic Quartz Glass Blank, , Shin-Etsu Chemical Co., Ltd.Shin-Etsu Quartz Products Co., Ltd., U. S. Patent n. 6,761,951 B2Bleaking, B.J., High refractive index homogeneity fused silica glass and method of making same Corning Incorporated, , U. S. Patent n. 2006/0137398 A1Santos, J.S., Lutkus, A.A.S., Ono, E., Suzuki, C.K., Effect of structure on the optical properties of silica glass produced by VAD process Journal of Non-Crystalline Solids, , to be submittedYamagata, S., Effects of OH-group on distribution of refractive index in silica glass (1992) Journal of Ceramic Society of Japan, 100, pp. 337-341Hetherington, G., Jack, K.H., Water in vitreous silica Part 1. Influence of water content on the properties of vitreous silica (1962) Physics and Chemistry of Glasses, 3, pp. 129-133Izawa, T., Early days of VAD process (2000) IEEE Journal Selected Topics in Quantum Electronics, 6, pp. 1220-1227Santos, J.S., Ono, E., Gusken, E., Suzuki, C.K., Correlation study between VAD preform deposition surface and germanium doping profiles (2006) Journal of Lightwave Technology, 24, pp. 831-837Santos, J.S., Ono, E., Suzuki, C.K., Automation process for on line monitoring of refractive index profile of VAD soot preforms for optical fiber (2006) Review of Scientific Instruments, 77, pp. 055106-055108Santos, J.S., Ono, E., Suzuki, C.K., Control of OH concentration radial variation of silica glass synthesized by VAD method Journal of the European Ceramic Society, , to be submitte