Method for fabricating thallium-doped GRIN lens

Details Method for fabricating thallium-doped GRIN lens Method for fabricating thallium-doped GRIN lens

2005-01-25

2005-01-25

Chin, Peter (Department: 1731)

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

C065S030140, C065S114000

Reexamination Certificate

active

06845634

ABSTRACT:
A fabrication method for a thallium-doped GRIN lens composed of a simplified glass composition is described. The composition is composed of silicon, oxygen, boron, zinc, potassium, sodium, and thallium. The method is comprised of preparing a cylindrical preform, annealing the cylindrical preform, removing contaminants from preform thereafter extruded to form a glass rod, exposing the glass rod to an alkali salt bath, and chemically milling the glass rod within an acid bath. Method and composition produce colorless lenses with a refractive index from 1.5900 to 1.7810, an insertion loss no greater than 0.05 dB, and a chromatic transmittance greater than 90 percent.

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