Optical CdO and ThO.sub.2 -free glass with refractive indices of

Optical colored and filter glass

Optical colored glass, its use, and an optical long-pass...

Optical colored glass, its use, and an optical long-pass...

Optical colored glasses

Optical crown glass having negative anomalous partial dispersion

Optical elements made from ThF.sub.4 --BeF.sub.2 glasses

Optical fiber amplifier and a glass therefor

Optical fiber composed of glass doped with laser-active ions of

Optical fiber formed of MgO--Al.sub.2 O.sub.3 --SiO.sub.2 glass

Optical fiber of the graded index type and method of producing s

Optical fibers having crystalline material and method of making

Optical filter glasses

Optical fluorophosphate glass having anomalous positive partial

Optical fluorophosphate glass with anomalous positive incrementa

Optical fluorophosphate glasses possessing positive anomalous pa

Optical functioning glass and apparatus using the same

Optical glass

Optical glass

Optical glass