Chemical properties of quartz glass

The optical properties of the quartz glass

Quartz glass is transparent ultraviolet, visible, near-infrared properties of the best glass, you can choose the required varieties 168nm-3500nm wavelength range from as needed.

Optical quartz glass grades

And compared to ordinary silicate glass, transparent quartz glass in the entire wavelength head through excellent performance. In the infrared region of the spectrum than normal through the large glass; in the visible region, the transmittance of the silica glass is relatively high. In the UV spectral region, especially in the short ultraviolet region, spectrum through better than other glass.
Spectral transmittance by three factors: the reflection, scattering and absorption. Reflective quartz glass is generally 8%, a large number of ultraviolet region, the infrared region smaller. Therefore, the transmittance of the quartz glass is generally not more than 92%. Quartz glass scattering is relatively small, generally can be ignored. Spectral absorption and impurity content and production processes quartz glass has a close relationship; sodium below 200 meter transmission segment level, representing the number of metal impurities; 240 nanometer absorption indicates how many hypoxia structure; visible absorption band is due to the presence of a transition metal ion caused by the absorption of 2730 nanometers is hydroxyl absorption peak, may be used to calculate the hydroxyl content. 

By hydroxy calculated spectral absorption method:
A GE's formula: C = 910 / T * LOG10 (Ta / Tb) mm-1

C: hydroxyl group content (C, ppm)
T: Thickness (mm)
Ta: 2600 sodium meter-long transmission
Tb: 2730 sodium meter-long transmission
B: China's national standard formula: C = 96.5 / d * LG10 (Ia / I) mm-1
C: hydroxyl content (ppm)
d: thickness (cm)
Ia: distance from the zero line to line 2730 Mickey sodium (mm)
I: 2730 nanometer absorption distance to the zero line (mm)

Spectral transmittance: thickness (1mm)
Other thicknesses spectral transmittance can be used to derive the formula: T = (1-R) 2 e -at

T: transmittance
R: Single reflection loss.
e: natural logarithm base.
t: thickness (cm)