Optical Properties of Quartz Glass Sheet (2)
According to quartz glass sheet’s optical properties can be divided into three categories: transparent in the visible and infrared spectral range; no significant absorption band in the range of 2600-2800nm.
Compared with ordinary silicate glass, transparent quartz glass plate has excellent permeability at the entire wavelength. The spectral transmission in the infrared region is larger than that in ordinary glass; in the visible region, the transmittance of quartz glass is also relatively high. The spectral region is especially in the short-wave ultraviolet region, and the spectral transmission is much better than other glasses.
The spectral transmittance is affected by three factors: reflection, scattering and absorption. The reflection of quartz glass is generally 8%, the ultraviolet region is larger, and the infrared region is smaller. Therefore, the transmittance of quartz glass is generally not more than 92%. Quartz glass The scattering is relatively small and generally negligible. The spectral absorption and the impurity content of quartz glass are closely related to the production process; the transmittance in the lower than 200 sodium band represents the content of metal impurities; 240 sodium Absorption indicates the number of oxygen-deficient structures; the absorption in the visible band is due to the presence of transition metal ions, and the absorption of 2730 sodium is the absorption peak of the hydroxyl group, which can be used to calculate the hydroxyl content.