Optical quartz glass
Quartz glass has excellent optical spectrum property . It can transmit far UV spectrum , is the best one of all UV transmitting materials ,and also transmit visible light and near infrared spectrum . The user can select any sort within the wave-range of 185 mu~3500mu .For its excellent properties ,such as : high temperature proof ,low thermal expansion ,chemical stability ,thermal stability ,and similar to ordinary optical glass in bubble , striae ,homogeneity ,birefringence, optical quartz glass became an essential optical material for high stability optical system under worst conditions .
Among the above mentioned products ,the HS infra-red optical quartz glass was awarded the " China National silver medal " for its excellent quality .
ZS-1 is a kind of synthetic quartz glass made from high pure tetrachloride silicon . It is characterized for the freedom from the bubbles ,highest purity of material ,the best transmittance in far UV spectrum ,high resistance to radiation . Wave length used :175 -2500 nm . Because formed by a " wet " process ,the fundamental vibrational band of incorporated structural hydroxyl ions will absorb strongly at 2730 nm . No grain structure .
ZS-2 is a kind of quartz glass made from synthetic or high pure silica raw material . Bubble free ,no grain structure . It has absorption at 2730 nm . Wave length used : 200-2500 nm
HS is made from quartz crystal by electric fusion . It is an ideal optical material whose advantages are almost no (OH) ,bubbles and striae , good transmission in IR spectrum .Wave length used : 260-3500nm .
Refraction index and Dispersion of Quartz glass
Type Properties
|
Transparent quartz glass from quartz crystal |
Synthetic quartz glass |
Nd (He 587.56nm) |
1.45857 |
1.45847 |
Nf (H 486.13 nm) |
1.46324 |
1.46314 |
Nc (H 656.27 nm) |
1.45645 |
1.45637 |
γ =(Nd-1)/(Nf-Nc) Nf-Nc |
67.6 0.00678 |
67.7 0.00677 |
Ks visible quartz glass is made by H
2,O
2 fusion crystal ,strongly absorbes at waveband : 200-2500nm and 2600-3800nm .
ZKHS is SiCi
4 synthetic quartz glass ,made by electric fusion . Its characteritics : no absorption at 185-3500nm ,high purity , bubble free ,no grain structure . ZKHS is the optimum one in quartz glass .
According to 7 indexes ( optical transmission and so on ) optical quartz glass is graded ( JC/T185-1996) :
A : optical transmission : 2 grades ;
B: Optical homogeneity: 5 grades ;
C:Birefraction : 5 grades
D:Stria : 2 grades
E: Grain non-homogeneity: 3 grades
F: Bubble : 7 grades
G: Fluorescence : 2 grades
The best grade for (100 g weight ) and most weight of our optical quartz glass :
Type Test Item
|
ZS-1 |
ZS-2 |
KS |
HS |
ZKHS |
Bubble |
0 |
2 |
2 |
1 |
1 |
Medium transmisson |
180-2500nm |
200-2500nm |
250-2500nm |
260-3500nm |
185-3500nm |
>90% |
>85% |
>85% |
>85% |
>85% |
Birefraction |
1-2 |
1-2 |
2 |
1-2 |
1-2 |
Grain structure |
1 |
2 |
2 |
2 |
1 |
Stria |
1-2 |
1-2 |
2 |
1-2 |
1-2 |
Homongeneity |
1-2 |
2 |
2 |
2 |
1-2 |
Fluorescence |
1 |
2 |
2 |
2 |
1 |
Radiation proof |
No color changing |
Tiny color changing |
Color changed |
Color changed |
No color changing |
Max weight ( kg) |
20 |
20 |
20 |
100 |
100 |