Optical lithography fluoride crystal annealing furnace

Single-crystal – oriented-crystal – and epitaxy growth processes; – Apparatus – For crystallization from liquid or supercritical state

Reexamination Certificate

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C117S003000, C117S081000, C117S083000

Reexamination Certificate

active

11059980

ABSTRACT:
A method of making below 250-nm UV light transmitting optical fluoride lithography crystals includes applying heat along a shortest path of conduction of a selected optical fluoride crystal, heating the optical fluoride crystal to an annealing temperature, holding the temperature of the optical fluoride crystal at the annealing temperature, and gradually cooling the optical fluoride crystal to provide a low-birefringence optical fluoride crystal for transmitting below 250-nm UV light.

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patent: 0869203 (1998-10-01), None
patent: 2000-026198 (2000-01-01), None

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