Custom-fabricated sapphire laser optics are available from Meller Optics Inc. They include planoconvex, planoconcave and meniscus lenses, and windows, mirrors and wave plates. Sizes from 1/4- to 10-in. diameter and 1/2-mm to 1-in. thick can be specified. Providing up to 85% transmission uncoated, from the UV to IR, they also can be supplied with various types of AR coatings for enhancing transmission to >99%. Featuring Moh 9 hardness — second only to diamond — the optics exhibit flatness to λ/10, parallelism to 2 arc sec, and surface finishes to <0.5 nm.