Meller Optics sapphire windows have uses in subsea UAV applications

Sapphire windows for subsea UAV applications withstand pressure to 10,000 psi, and resist salt water, chemicals, and fast-moving particles. Featuring Mohs 9 hardness, they are fabricated to a flatness held to 0.5 fringes of HeNe and parallelism from 20 to 2 arcsec in sizes from 1/4 to 10 in. diameter with varying thicknesses, mounting profiles, steps, and edge treatments.
Meller Optics
Providence, RI
www.melleroptics.com