Lead glass composition series for gradient glasses

Details Lead glass composition series for gradient glasses Lead glass composition series for gradient glasses

1993-11-24

1995-10-17

Gonzalez, Frank

Optical: systems and elements

Lens

With graded refractive index

359652, 359654, G02B 1320

Patent

active

054596130

ABSTRACT:
A fused glass block having an axial gradient index of refraction profile between two opposed parallel surfaces, with a change in refractive index from one of the surfaces to the other ranging from about 0.04 to 0.47, is provided. The fused glass block has a change in thermal expansion coefficient from one of the surfaces to the other of less than about 3.times.10.sup.-7 .degree.C..sup.-1, has essentially no strain or birefringence therein, and has a smoothly varying refractive index profile from one of the surfaces to the other. The fused glass block is prepared from at least two pre-selected compositions of a lead-silicate glass series that has been discovered to provide the requisite properties.

REFERENCES:
patent: 4883522 (1989-11-01), Hagerty et al.
patent: 4907864 (1990-03-01), Hagerty et al.
patent: 4929065 (1990-05-01), Hagerty et al.
patent: 5044737 (1991-09-01), Blankenbecler
patent: 5200858 (1993-04-01), Hagerty et al.

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