Optical glass suffering little change in refractive index by radiation of light
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United States of America Patent
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May 15, 2007
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N/A
app pub date -
Sep 18, 2003
filing date -
Jun 5, 2000
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Abstract
An optical glass wherein an amount of change in refractive index (.DELTA.n: difference in refractive index between a state before radiation and a state after radiation) caused by radiation of laser beam at wavelength of 351 nm having average output power of 0.43W, pulse repetition rate of 5 kHz and pulse width of 400 ns for one hour is 5 ppm or below is provided. The optical glass comprises a fluorine ingredient and/or a titanium oxide ingredient and/or an arsenic oxide ingredient. The optical glass suffers little change in refractive index by radiation of strong light having wavelengths of 300 nm to 400 nm such as ultraviolet laser.
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