Abstract: A low-or no-silica, low- or no-alkali phosphate glass useful as a laser amplifier in a multiple pass, high energy laser system having a high thermal conductivity, K.sub.90.degree. C. >0.85 W/mK, a low coefficient of thermal expansion, .alpha..sub.20.degree.-300.degree. C. <80.times.10.sup.-7 /.degree.C., low emission cross section, .sigma.<2.5.times.10.sup.-20 cm.sup.2, and a high fluorescence lifetime, .tau.>325 .mu.secs at 3 wt. % Nd doping, consisting essentially of (on an oxide composition basis):______________________________________ Mole % ______________________________________ P.sub.2 O.sub.5 52-72 Al.sub.2 O.sub.3 0-<20 B.sub.2 O.sub.3 >0-25 ZnO 0-31 Li.sub.2 O 0-5 K.sub.2 O 0-5 Na.sub.2 O 0-5 Cs.sub.2 O 0-5 Rb.sub.2 O 0-5 MgO >0-<30 CaO 0-20 BaO 0-20 SrO 0-<20 Sb.sub.2 O.sub.3 0-<1 As.sub.2 O.sub.3 0-<1 Nb.sub.2 O.sub.5 0-<1 Ln.sub.2 O.sub.3 up to 6.5 PbO 0-<5 SiO.sub.2 0-3 ______________________________________whereinLn.sub.2 O.sub.

Abstract: A silicate glass article comprising an amount of SiO.sub.2 effective as a network former and,at least one surface of said article having a substantially continuous silver and hydration content over its area, effective to render said surface darkenable upon exposure to electron beam radiation but substantially not thermoplastic,said article having been substantially darkened by electron beam irradiation over at least a portion of at least one surface thereof,and said article having geometric characteristics suitable for functioning as a photomask reticle, optical disk or similar archival storage medium.

Abstract: Silicate glasses are provided which when exposed to a silver ion exchange surface treatment are writable with electron beams. These glasses contain OD agents and do not require elements having 1-4 d-electrons in the atomic state.

Abstract: A strengthened high NdO.sub.3 -containing glass has the composition of, in weight percent______________________________________ SiO.sub.2 40-60 Nd.sub.2 O.sub.3 10-30 As.sub.2 O.sub.3 /Sb.sub.2 O.sub.3 0-1 B.sub.2 O.sub.3 5.15 Na.sub.2 O 3-18 ZnO 0.1-10 Li.sub.2 O 0-3 K.sub.2 O 0-3 Al.sub.2 O.sub.3 0-7 PbO 0-15 MgO 0-3 CaO 0-3 BaO 0-3 SrO 0-3 .SIGMA.V.sub.2 O.sub.5, Cr.sub.2 O.sub.3, Mn.sub.2 O.sub.3 0-7 Fe.sub.2 O.sub.3, CoO, NiO, CuO TiO.sub.2 0-5 Pr.sub.6 O.sub.11 0-1.

Abstract: A colored contrast enhancement glass comprises, in wt. %:______________________________________ SiO.sub.2 40-60 B.sub.2 O.sub.3 0-6 Al.sub.2 O.sub.3 0-2 .SIGMA.Li.sub.2 O, Na.sub.2 O, K.sub.2 O = R.sub.2 O 24-30 .SIGMA.MgO, CaO, SrO, ZnO, BaO = RO 0-10 TiO.sub.2 1-3.5 CeO.sub.2 1-3.5 Nd.sub.2 O.sub.3 4-12 La.sub.2 O.sub.3 1-11 MnO.sub.2 0.1-1.0 Er.sub.2 O.sub.3 (when included) 0.2-1.0 CuO 0.1-0.5 CoO 0.0005-0.0040 V.sub.2 O.sub.5 0.05-0.50 Cr.sub.2 O.sub.3 (when included) 0.0005-0.0300 Photopic % T 12-24 % T @ 445 nm 20-30 % T @ 555 nm 26-36 % T @ 580 nm 0-3 % T @ 618 nm 23-35 % T @ 620 nm 23-34 ______________________________________having color properties corresponding to values of (x,y) of the larger quadrangle of FIG. 1.

Abstract: Glasses containing chromophores are partially struck to produce no coloring or only light coloring due to the chromophore. The glasses are colored as desired by contents of colorant ions.

Abstract: A strengthened high lanthanide-containing glass has the composition of, in mole percent______________________________________ SiO.sub.2 54-75 B.sub.2 O.sub.3 5-17 Li.sub.2 O 0-4 Na.sub.2 O 3-18 K.sub.2 O 0-4 Al.sub.2 O.sub.3 0-7 PbO 0-4 MgO 0-3 CaO 0-3 SrO 0-3 BaO 0-3 ZnO 0.1-10 TiO.sub.2 0-5 Ln.sub.2 O.sub.3 3-7 V.sub.2 O.sub.5 + Cr.sub.2 O.sub.3 + Mn.sub.2 O.sub.3 0-5 Fe.sub.2 O.sub.3 + CoO + NiO + CuO As.sub.2 O.sub.3 /Sb.sub.2 O.sub.3 0-0.4 ______________________________________wherein Ln is La, Ce, Pr, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm and/or Yb.

Abstract: A low- or no-silica phosphate glass useful as a high average power laser medium and having a high thermal conductivity, K.sub.90.degree. C. >0.8 W/mK, and a low coefficient of thermal expansion, .alpha..sub.20.degree.-300.degree. C. <90.times.10.sup.-7 /.degree.C., consisting essentially of (on a batch composition basis):______________________________________ Mole % ______________________________________ P.sub.2 O.sub.5 45-70 Li.sub.2 O 0-14 Na.sub.2 O 0-12 K.sub.2 O 0-6 Al.sub.2 O.sub.3 9-15 Nd.sub.2 O.sub.3 0.01-6 La.sub.2 O.sub.3 0-6 SiO.sub.2 0-8 B.sub.2 O.sub.3 0-8 MgO 6-30 CaO 0-15 SrO 0-9 BaO 0-9 ZnO 0-15 .SIGMA. MgO + Li.sub.2 O 20-30 ______________________________________whereby said glass has K.sub.90.degree. C. >0.8 W/mK and .alpha..sub.20.degree.-300.degree. C. <90.times.10.sup.-7 /.degree.C. The Nd.sub.2 O.sub.3 can be replaced by other lasing species.

Abstract: Glass fiber cores having a glass composition:______________________________________ Compositional Oxide Range in wt % ______________________________________ SiO.sub.2 25-35 BaO 6-15 K.sub.2 O 1-6 Na.sub.2 O 0-4 La.sub.2 O.sub.3 0-10 Nb.sub.2 O.sub.5 4-12 PbO 10-50 TiO.sub.2 0-4.

Abstract: A low- or no-silica phosphate glass useful as a laser medium and having a high thermal conductivity, K.sub.90.degree. C. >0.8 W/mK, and a low coefficient of thermal expansion, .alpha..sub.20.degree.-40.degree. C. <80.times.10.sup.-7 /.degree.C., consists essentially of (on a batch composition basis):______________________________________ Mole % ______________________________________ P.sub.2 O.sub.5 45-70 Li.sub.2 O 15-35 Na.sub.2 O 0-10 Al.sub.2 O.sub.3 10-15 Nd.sub.2 O.sub.3 0.01-6 La.sub.2 O.sub.3 0-6 SiO.sub.2 0-8 B.sub.2 O.sub.3 0-8 MgO 0-18 CaO 0-15 SrO 0-9 BaO 0-9 ZnO 0-15 ______________________________________the amounts of Li.sub.2 O and Na.sub.2 O providing an average alkali metal ionic radius sufficiently low whereby said glass has K.sub.90.degree. C. >0.8 W/mK and .alpha..sub.20.degree.-40.degree. C. <80.times.10.sup.-7 /.degree.C., and wherein, when the batch composition is melted in contact with a silica-containing surface, the final glass composition contains at most about 3.

Abstract: A colored glass suitable for enhancing contrast of color CRT displays consists essentially of, in weight %:______________________________________ SiO.sub.2 40-60% B.sub.2 O.sub.3 0-6% Al.sub.2 O.sub.3 0-2% Sum Li.sub.2 O + Na.sub.2 O + K.sub.2 O 24-30% Sum MgO + CaO + SrO + BaO + ZnO 0-10% TiO.sub.2 1-3% CeO.sub.2 1-3% Nd.sub.2 O.sub.3 10-25% Er.sub.2 O.sub.3 1-5% Sm.sub.2 O.sub.3 0-3% Sum Er.sub.2 O.sub.3 + Sm.sub.2 O.sub.3 1-8% CuO 0.1-0.5% MnO.sub.2 0.1-1.0%.

Abstract: Alkali-free borosilicate glass have been developed having coefficients of thermal expansion (+20.degree. C. to +200.degree. C.) below 40.5.times.10.sup.-7, densities less than 3.0 g/cm.sup.3 and good visible and UV transmission, and can be produced by conventional continuous melting techniques. These glasses are particularly suitable for photomask, photovoltaic and mirror substrate applications. Their compositions comprise, in weight percent:______________________________________ SiO.sub.2 50-60% B.sub.2 O.sub.3 1-6% Al.sub.2 O.sub.3 12-15% MgO 0-2.5% CaO 0-5.1% BaO 9-10% ZnO 12-18% CeO.sub.2 0-5% As.sub.2 O.sub.3 + 0-1.5% Sb.sub.2 O.sub.3 PbO 0-1% ______________________________________Sum MgO+CaO+BaO+ZnO=21-33.5.

Abstract: An ophthalmic glass particularly useful as a segment glass consists essentially of, in weight percent:______________________________________ SiO.sub.2 23-32 B.sub.2 O.sub.3 4-7 Al.sub.2 O.sub.3 0.5-3 BaO 23-30 PbO 15-30 TiO.sub.2 0.5-10 La.sub.2 O.sub.3 5-20 Nb.sub.2 O.sub.5 0-1.

Abstract: An optical quality glass suitable for use in ophthalmic lenses having a refractive index of at least 1.59, an Abbe number of at least 40.5, a density of no greater than 2.67 g/cm.sup.-3, and a coefficient of thermal expansion .alpha. of less than 90.times.10.sup.-7 per .degree.C. contains at least 90 mole % of SiO.sub.2, Li.sub.2 O, Na.sub.2 O, K.sub.2 O, CaO, and TiO.sub.2, and essentially does not contain Al.sub.2 O.sub.3, B.sub.2 O.sub.3, or oxides of elements having atomic weights above 90, such as Nb.sub.2 O.sub.5, La.sub.2 O.sub.3, or ZrO.sub.2.

Abstract: 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.