Jenaer Glaswerk Schott & Gen.

Walter Jahn

Marga Faulstich

Norbert Neuroth

Georg Krolla

Werner Schumann

Otto Deutschbein

Optical glass is disclosed which has an increased resistance to solarization and irradiation as well as little or no undesirable coloring. This glass is designed to exhibit as many properties having optimal values as possible. The silicate glass used is free of alkaline earth metal oxides and incorporates CeO.sub.2 and both zinc and strontium ions in very small concentrations. The latter two materials further improve the solarization and irradiation resistance properties of the glass. Furthermore, as the zinc and strontium ions are effective when used in low concentrations, they serve to minimize any undesirable glass coloring.

Solarization and irradiation resistant optical glasses

Glass composition ranges are described which permit the introduction of laser activators into fluorphosphate glass with exceptionally high fluorine content while forming glasses of high crystallization stability and permitting the realization of large melt volumes. The high fluorine content imparts to the glasses an exceptionally low nonlinear refractive index n.sub.2 down to O,4 .times.10.sup.-13 esu.

Glasses having a low non-linear refractive index for laser applications

Lithium-free silver-activated phosphate glass suitable for use in radio-photoluminescence dosimetry and having improved chemical resistance, particularly to weathering, is provided by controlling the alkali metal metaphosphate content in the glass compositions to not more than 26% by weight, preferably 15-26% by weight, and the alkaline earth metaphosphate content to at least 16% by weight, preferably 16-27% by weight, based on the total composition.

Glass for radio-photoluminescence dosimetry

An optical quality glass composition suitable for the production of optical elements with a refractive index gradient delta n of at least 100.times.10.sup.-4 by utilizing an ion exchange, consisting essentially of the following synthesis composition, in % by weight:

Glass for the production of optical elements with refractive index

The invention provides a process for producing a transparent optical-glass body having a linear index of refraction gradient. Particles of optical glass which contain leachble ingredients are pressed to form a self-supporting porous optical glass body. Some of the leachable ingredient is leached from a part of the porous glass, and a different amount is leached from a second part of the porous glass, the index of refraction varying in proportion to the different amounts leached from the glass body. The porous optical glass body is heated to eliminate the pores. Various means for effecting the different amounts of leaching over the length of the glass body are shown.

Process for the manufacture of optical bodies with refractive index

A neodymium-doped phosphate laser glass composition having a low threshold for stimulated emission, a negative temperature coefficient of refractive index, high acid resistence and homogeneity even in large structures comprises P.sub.2 O.sub.5, Na.sub.2 O or K.sub.2 O, Al.sub.2 O.sub.3, Nd.sub.2 O.sub.3, and optionally, F or RO, wherein R is Mg, Ba, Ca, Sr or Zn.

Athermal laser glass

A compact, self-supporting solid article of manufacture consisting essentially high temperature and wear-resistant antifriction material of low thermal expansion in the form of a heterogeneous sintered article of a matrix of glass or glass ceramic of low thermal expansion and distributed within the matrix small particles of at least one temperature and wear-resistant antifriction oxide selected from the group consisting of nickel oxide, cobalt oxide, ferric oxide, bismuth oxide and chromic oxide.

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Ingelheim, Germany

Walter Jahn