Polished Fused Silica plates with a 40/20 finish are economically priced and deliveries are excellent, frequently from stock.
Commonly available sizes of Fused Silica wafers, substrates and plates include 6"x6" x 0.120" thick, 5" square x 0.090", 5" square x 0.180", 5" square x 0.250", 6" square x 0.150, 6" square x 0.250", and 7.25" diameter x 0.150" thick with 1.00" flats on each side. Very high quality surface finishes are also available up to 10/5 scratch/dig (< 7 Angstroms) and better.
Key properties of Fused Silica (SiO2) include near zero thermal expansion, very good thermal shock resistance and chemical inertness, low dielectric constant and dielectric loss, and excellent transmission in the UV and visible ranges. These properties make polished Fused Silica wafers and substrates ideal for thermal imaging, microlithography, Excimer and Nd: YAG laser applications. Lenses and windows of Fused Silica are also used in highly variable temperature environments as well as for microwave and millimeter wave components.
Valley Design is an ISO 9001:2008 Certified company, supplying lapping, thinning, polishing, wafering, and dicing services for optics, photonics, semiconductor, aerospace and medical industries. Valley manufactures wafers, windows, substrates and other flat electro and electro-optical components. Sapphire, Quartz, Silicon, Aluminas, Glass, and many other materials processed.