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1. (WO2018198774) ULTRAVIOLET-RESISTANT QUARTZ GLASS AND METHOD FOR MANUFACTURING SAME

Pub. No.:    WO/2018/198774    International Application No.:    PCT/JP2018/015233
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Thu Apr 12 01:59:59 CEST 2018
IPC: C03B 20/00
C03C 3/06
G02B 1/00
Applicants: TOSOH SGM CORPORATION
東ソ-・エスジ-エム株式会社
Inventors: HORIKOSHI Hideharu
堀越 秀春
Title: ULTRAVIOLET-RESISTANT QUARTZ GLASS AND METHOD FOR MANUFACTURING SAME
Abstract:
The present invention pertains to: a method for manufacturing ultraviolet-resistant quartz glass, said method including melting a synthetic silica powder; and a method for manufacturing an ultraviolet-resistant quartz glass, said method including performing arc plasma melting of a silica powder. Provided is an ultraviolet-resistant quartz glass having an ultraviolet-resistance of 2500 seconds, wherein, taking the initial transmittance during irradiation of a quadruple higher harmonic (266 nm) of a YAG laser (irradiation performed at a YAG laser output of 180 mW, pulse width of 20 nsec, and frequency of 80 kHz) at an optical path length of 30 nm to be 100%, the irradiation period until the transmittance falls to 3% is defined as resistance to ultraviolet rays (referred to as ultraviolet-resistance). Also provided is an optical member for YAG-laser higher harmonics, said optical member comprising this quartz glass.