Common technical indexes of optical glass

Glass can change the propagation direction of light and the relative spectral distribution of ultraviolet, visible or infrared light.

Optical glass can be used to manufacture lenses, prisms, mirrors and windows in optical instruments.

The components composed of optical glass are the key components in optical instruments.

Optical glass has high transparency, high physical and chemical uniformity and specific and accurate optical coefficients.

Refractive index (nd): the refractive index of glass is measured by the characteristic spectral line of sodium element d = 589.3nm, expressed in Nd.

Specific gravity (s): determine the specific gravity of glass by hydrostatic weighing method.

Chromaticity value (XY, y): determine the chromaticity value of glass illuminated by a and D65 standard light sources according to the methods specified by the International Commission on illumination (CIE) in 1931 and 1964.

Thermal characteristics: when the glass temperature rises by 1 ℃, the relative change rate of its length.

Transition temperature (TG): when the expansion of glass changes suddenly, the corresponding temperature is the transition temperature of the sample. At this temperature, the viscosity of the glass is close to 1013 pascals

Softening temperature (TS): when the physical properties of the glass change sharply and its swelling volume exceeds the temperature when it is close to zero (the softening temperature of the glass, at which time the viscosity of the glass is close to 1011 PA) seconds.

Color temperature transformation ability (V): color temperature glass is divided into two types: color temperature increasing glass and color temperature decreasing glass, and its transformation ability is expressed by mired value; The color temperature rising glass is blue, the brand is SSB, and its Millard is negative. The reduced color temperature glass shows spot color, the brand is sjb, and its Millard is positive

Spectral properties of optical glass

According to the spectral characteristics of colored optical glass, it can be divided into three categories

1. Cut off glass

Their spectral characteristic index is based on the transmission limit wavelength λ TJ allowable deviation of transmission limit, transmittance t of specified wavelength λ O and curvature slope k, etc.

Cut off glass

2. Select absorbing glass

Glass only transmits (or absorbs) light in a certain (or several) wavelength range, and its spectral characteristic index is based on the specified glass thickness at a specific wavelength λ The transmission ratio and allowable transmission deviation value at.

Select absorbing glass

3. Neutral glass

The light of each wavelength of the glass in the visible light is absorbed uniformly without selection, and its spectral characteristic index is based on the average transmittance TP and the allowable deviation range of the average transmittance △ TP. The maximum allowable deviation value QZ.

Neutral glass


Hanzhong Brisun Optics Co., Ltd. Is the high precision optical element manufacturer provides customized production of Various optical lenses, including spherical lens, cylindrical lens, optical window, mirror, prism, filter, metal base mirror and other high-precision optical elements. The base materials include various optical glass, fused quartz, calcium fluoride (CaF2), zinc selenide (ZnSe), germanium (GE), silicon (SI), sapphire, metal and other materials. And provide antireflective film, high reflection film, spectroscopic film, metal film and other optical coatings.

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