Oxygen-free optical glasses

Description

Oxygen-free infrared optical glasses are intended for the manufacture of parts for devices operating in the wavelength range of 0.7–17 µm.

The shift of the edge of the fundamental absorption bands to the infrared spectral range is due to the replacement of oxygen in the glass composition by its analogs (sulfur, selenium, tellurium).

Oxygen-free infrared optical glass code IKS25

Application area

Oxygen-free infrared optical glass intended for the manufacture of optical elements (windows, prisms, lenses, filters) of optical infrared devices, thermal imagers for medical and technical purposes, biological and environmental monitoring systems operating in the wavelength range of 1.5 ÷ 17 microns.

Спектральные кривые коэффициента пропускания образцов стекла ИКС25 толщиной 2 и 10 мм. Пунктиром показана кривая собственного излучения стекла ИКС25 при температуре 160oС.

Spectral characteristics

Wavelength, micrometers Transmission, % (at samples thickness of 10 mm) Attenuation rate, cm-1
2,00,560,05
3,00,600,02
4,0–12,00,61
14,00,430,16
16,0—

Characteristics

Characteristic Value
Transparency range1.5÷17  μm
Refractive index for the wavelength of 2 μm131
Refractive index for the wavelength of 10 μm152
Density4.72 g/cm3
Elastic modulus19 GPa
Glass transition temperature, Tg150 oC
Softening point190 oC
Coefficient of linear thermal expansion ᾳ × 107 from -60 to +20 °C197
Coefficient of linear thermal expansionᾳ × 107from +20 °C to Tg220
Maximum operating temperature100 оС
Blank size25–300 mm a

a — the ratio of the diameter or diagonal of the glass blank to its thickness from 3: 1 to 10: 1 providing that the thickness is of at least 5 mm