Patent · US Expired

Method for fabricating thallium-doped GRIN lens

US6845634B2 · kind B2 · utility

0Cited by

9References

6Claims

0Family size

Assignee

Wave Crossing Corporation · US

Inventors

Hong Tan · San Jose, US
Youmin Liu · Palo Alto, US
Yushan Tan · Shanghai, CN

Key dates

Filing date	Jun 20, 2002
Grant date	Jan 25, 2005
Priority date	—
Expiry date	Aug 22, 2023

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC03C21/002
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.