Schott Glass Technologies, Inc.

The United States of America as Represented by the United States

Lee M Cook

Karl-Heinz Mader

Stanley E Stokowski

Roland Schnabel

Alexander J Marker, Iii

Reinhard Kassner

A colored glass suitable for enhancing contrast of color CRT displays consists essentially of, in weight %:

Contrast enhancement filter glass for color CRT displays

Neodymium-doped phosphate glasses having a refractive index, nd&gt;1.520; an Abbe number, Vd, &lt;60; a density &lt;3.0 g/cm.sup.3, a thermal expansion coefficient, .alpha., .ltoreq.110.times.10.sup.-7 .degree.C..sup.-1 ; a Young's Modulus, E, &lt;70.times.10.sup.3 N/mm.sup.2 ; a Poisson's Ratio, .nu., &lt;0.28; a thermal conductivity, K, &gt;0.5 W/m.multidot.K, a thermal FOM=(1-.nu.).multidot.K/.alpha.E&gt;0.7, consisting essentially of, in mol. %:

Silica and boron-containing ultraphosphate laser glass with low

An ophthalmic glass particularly useful as a segment glass consists essentially of, in weight percent:

Highly prefractive, low dispersion optical glass suitable for multifocal

Glass surfaces are modified using controlled chemical corrosion to reduce reflection for a variety of existing optical and ophthalmic silicate glass compositions containing at least 5 weight % of alkali metal, using neutral or slightly alkaline aqueous solutions (pH: 7.0-8.5) at temperatures of 20.degree.-100.degree. C. The solutions contain an electrolyte having a dissociation constant greater than 10.sup.-6 and contain a polyvalent metal ion. Selection of the proper range of the ratio of glass surface area treated to treating solution volume is critical for achieving satisfactory results for optical applications as well as for making the process simple, repeatable, and inexpensive. Using this invention, antireflective surfaces may be produced on optical devices of complex configuration with high uniformity. Such surfaces provide substantially improved performance in high energy laser systems where exposure to laser light of extremely high intensity and short duration will destroy or degrade conventionally applied coatings.

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Duryea, PA, United States of America

Lee M Cook