Meller sapphire viewport windows for reliable seal
July 11, 2013 – Custom engineered and fabricated sapphire viewport windows that can be metalized, brazed and sealed into Kovar and stainless steel sleeves are now available from Meller Optics. The company’s Sapphire viewport windows feature Moh 9 hardness, which is second only to diamond, and can operate from UHV to 10,000 psi at temperatures from cryogenic to 1,000C, depending upon configuration. Available in flat and spherical configurations from 1/4 in. to 10 in. dia. and 1/2 mm to 1 in. thick with A/R coatings, Meller Sapphire viewport windows feature flatness of 0.5 fringes HeNe and parallelism from 20 to 2 arc/secs.