The optical performance of quartz sheet is unique. It can not only penetrate far ultraviolet ray, which is the best of all ultraviolet transmitting materials, but also penetrate visible light and near-infrared spectrum. As quartz glass is resistant to high temperature, has very small thermal expansion coefficient, good chemical stability, and is comparable to ordinary optical glass in terms of bubbles, stripes, homogeneity and birefringence, it is an essential optical material with high stability optical coefficient when working in various adverse situations.

According to its optical properties, it can be divided into three categories:

1. Far ultraviolet optical quartz glass JGS1

Transparent in the range of ultraviolet and visible spectrum; There is no absorption band in the range of 185-250nm; There are strong absorption bands in the range of 2600-2800nm; Non luminous, stable light radiation.

2. Ultraviolet optical quartz glass JGS2

Transparent in the range of ultraviolet and visible spectrum; There is no absorption band in the range of 200-250nm; There are strong absorption bands in the range of 2600-2800nm; Non luminous, stable light radiation.

3. Infrared optical quartz glass JGS3

Transparent in visible and infrared spectra; There is no obvious absorption band in the range of 2600-2800nm.

Compared with ordinary silicate glass, transparent quartz glass has excellent transmissivity in the whole wavelength head. In the infrared region, the spectral transmittance is greater than that of ordinary glass; In the visible area, the transmissivity of quartz glass is also relatively high. In the ultraviolet spectral region, especially in the short wave ultraviolet region, the spectral transmission is much better than other glasses

Spectral transmittance is affected by three factors: reflection, scattering and absorption. The reflection of quartz glass is generally 8%, with larger ultraviolet region and smaller infrared region. Therefore, the transmissivity of quartz glass is generally not more than 92%. The scattering of quartz glass is relatively small and can generally be ignored. Spectral absorption is closely related to impurity content of the quartz glass and production process; The transmissivity in the band below 200 nm represents the content of metal impurities; The absorption of 240 nm indicates the number of anoxic structure; The absorption in the visible band is caused by the presence of transition metal ions. The absorption at 2730 nm is the absorption peak of hydroxyl, which can be used to calculate the content of hydroxyl.

The spectral transmissivity is calculated using the method of spectral absorption hydroxyl: A GE's calculation formula: C=910/T * LOG10 (Ta/Tb) mm-1 C: hydroxyl content (C, ppm) T: thickness (mm) Ta: transmissivity at 2600 nm wavelength Tb: transmissivity at 2730 nm wavelength B: Chinese national standard calculation formula: C=96.5/d * LG10 (Ia/I) mm-1 C: hydroxyl content (ppm) d: thickness (cm) Ia: distance from baseline to zero line at 2730 nm (mm) 1: Distance from 2730 nm absorption peak to zero line (mm) Spectral transmissivity: 1mm thick) Spectral transmissivity of other thicknesses can be derived from the formula: T=(1-R) 2 e - at T: transmissivity R: single reflection loss. e: Natural logarithmic radix. t: Thickness (cm) Spectral transmissivity Wavelength nm