USA As Represented by Secretary of the Navy

Government of the United States of America, As Represented by the Secretary of Commerce

Albert Feldman

Nicholas Lagakos

Douglas H Blackburn

Edward N Farabaugh

An improved method of producing transparent diamond laminates employs a substrate which is removed once a second layer is deposited over the diamond coating, thereby exposing a smooth diamond surface. The second coating should have a refractive index substantially identical to diamond, with zinc selenide and titanium dioxide being particularly preferred. Diamond films having two smooth surfaces may be produced by simultaneous deposition on parallel, opposed substrates until the two diamond films merge together to form a single film or plate, followed by removal of at least a portion of the two substrates.

Method of producing a smooth plate of diamond

Pressure and temperature insensitive optical fibers are produced using a Ta.sub.2 O.sub.5 based glass composition which has a high bulk modulus and a low thermal expansion coefficient. The glass composition can function as the cladding in the optical fiber or as a protective coating which surrounds the cladding thereby protecting the fiber from fluctuations in temperature and pressure.

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Rockville, MD, United States of America

Albert Feldman