USA As Represented by Secretary of the Navy

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

David C Cranmer

Douglas H Blackburn

Dale A Kauffman

David G Cooper

James L Dexter

Craig Stone

James Grundl

A Faraday rotator glass composition based on a fluoride glass, phosphate glass, fluorophosphate glass or a mixture thereof is doped with a lanthanide in a concentration sufficient to provide a Verdet constant above at least 2870 deg/Tesla-meter [(1 min/cm-Oe).times.(1.667.times.10.sup.4)=1 deg/Tesla-meter] and optical transmission above at least 50 percent in a 25 mm thick polished glass sample at least at one wavelength in the 200 to 400 nm wavelength region. The Faraday rotator glass also includes monovalent non-lanthanide cations such as Na, Li, K or mixtures thereof in a concentration sufficient to provide a Verdet constant above at least 2870 deg/Tesla-meter and optical transmission above at least 50 percent in a 25 mm thick polished glass sample at least at one wavelength in the 200 to 400 nm wavelength region. The Faraday rotator glass further includes a concentration of divalent or trivalent non-lanthanide cations such as Mg, Be, Ca, Al or mixtures thereof sufficient to provide surface flatness of at least 1/10 of the operating wavelength at 632.8 nm.

Ultraviolet Faraday rotator glass

Neutron absorbing glass compositions comprise SiO.sub.2, .sup.6 Li.sub.2 O and optionally Al.sub.2 O.sub.3. The compositions may further include PbO. The compositions provide neutron absorption without release of gamma rays.

Neutron absorbing glass compositions

Growing community of inventors

Brookeville, MD, United States of America

David C Cranmer