Kabushiki Kaisha Ohara

Satoru Matsumoto

Muneo Nakahara

Tatsuya Senoo

Akira Masumura

Naoyuki Goto

Kazuo {overscore (O)}hara

An optical glass wherein an amount of change in refractive index (&#x394;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 0.43 W, 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.

Optical glass suffering little change in refractive index by radiation of light

An optical glass wherein an amount of change in refractive index (&#x394;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.

Growing community of inventors

Sagamihara, Japan

Satoru Matsumoto