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Material
 

Union Optic can supply many optical materials, like colorless optical glasses, color glasses, infrared materials, UV materials and also optical crystals.

Usually, the material we used is Chinese material unless specified. If you can not confirm which material is the right one, please contact us.

All the material we provided are RoHS Compliant!
 
Union Optic can provide all the material listed below:
 
Materials
Refractive Index
Transmission
Range(um)
Thermal Expansion
Coefficient (10-6/K)
Density(g/cm3)
BK7
1.5164 (588nm)
0.330 - 2.1
7.5
2.52
Fused Silica
1.4858 (308nm)
0.185 - 2.5
0.58
2.20
Quartz
no=1.5427 ne=1.5518 (633nm)
0.200 - 2.3
13.2||a;7.1||c
2.65
CaF2
1.399 (5000nm)
0.170 - 7.8
18.85
3.18
MgF2
no=1.3836 ne=1.3957 (405nm)
0.120 - 7.0
13.7||a;8.48||c
3.17
Sapphire
1.755 (1000nm)
0.180 - 4.5
8.4
3.98
Silicon
3.426 (5000nm)
1.2 - 7.0
2.55
2.33
Germanium
4.004 (10000nm)
2.0 - 14.0
5.5
5.33
ZnSe
2.4028 (10600nm)
0.55-20.0
7.6
5.27
YVO4
no=1.9500 ne=2.1554 (1300nm)
0.400 - 5.0
4.43||a; 11.37||c
4.22
Calcite
no=1.6557 ne=1.4852 (633nm)
0.210 - 2.3
5.68||a; 24.39||c
2.7
a-BBO
no=1.6749 ne=1.5555 (532nm)
0.190 - 3.5
4.0||a; 36.0||c
3.85
LiNbO3
no=2.2863 ne=2.2027 (633nm)
0.370 - 4.5
14.8||a;4.1||c
4.64
 
BK7
 
BK7 is an excellent general purpose material widely used in visible and NIR optical components. BK7 is a borosilicate crown optical glass.
  • Transmission Range: 330 nm~2100 nm
  • Thermal Expansion Coefficient: 7.5X10-6 /K
  • Density: 2.52 g/cm3
 
Fused Silica
 
Fused silica is a widely used material with high chemical purity, good thermal characteristics and excellent homogeneity. Very good thermal expansion characteristic is an outstanding feature of fused silica. Fused Silica is primarily used in wider thermal application. Fused silica includes UV grade and IR grade.
  • Typical index Homogeneity: < 8 x 10-6
  • Thermal Expansion Coefficient: 0.58 x 10-6 /K
    (0℃to 200℃)
  • Density: 2.201 g/cm3
 
Quartz
 
Although crystal quartz is made of SiO2, it is different from fused silica, it is a positive uniaxial birefringent crystal. It features its very small birefringent refractive index difference, so it is always used in waveplates and other polarization control application.
  • Transmission Range: 200 nm~2300 nm
  • Thermal Expansion Coefficient: ||a=13.2 x 10-6/K, ||c=7.1 x 10-6/K
  • Density: 2.65 g/cm3
 
CaF2
 
CaF2 is a cubic single crystal. It has good transmission from UV to middle infrared wavelength. It is always used in excimer laser components. While, it is a little hygroscopic and susceptible to thermal shock.
  • Transmission Range: 170nm~7800nm
  • Thermal Expansion Coefficient: 18.85 x 10-6/K (20℃ to 60℃)
  • Density: 3.18 g/cm3
 
MgF2
 
MgF2 is a tetragonal positive birefringent crystal. MgF2 has good chemical, mechanical and thermal characteristics compared with CaF2. Due to its high vacuum UV transmission and high damage threshold, MgF2 is usually used in VUV and excimer laser windows, polarizers, lenses and etc.
  • Lattice Constant: a=4.621A; c=3.053A
  • Mohs Hardness: 6
  • Density: 3.17g/cm3
  • Transparence Range: 120nm ~ 7000nm
  • Thermal Conductivity: 0.0075W/m/K
  • Thermal Expansion Coefficient: ||a=13.7x10-6/K
    ||c=8.48x10-6/K
  • Index of Refraction: @405nm no=1.3836, ne=1.3957
 
Sapphire
 
Sapphire is a single crystal aluminum oxide (Al2O3). Its Mohs hardness is 9, it is one of the hardest materials. Sapphire has good mechanical strength, and it is also transparent from visible to IR spectrum. So, it is always used as window material where scratch resistance is required.
  • Lattice Constant: a =4.75 A; c =12.97A
  • Transparent Range: 180nm ~ 4500nm
  • Density: 3.98g/cm3
  • Mohs Hardness: 9
  • Melting Point: 2030℃
  • Thermal Conductivity: 0.04W/m/K
  • Expansion Coefficient: 8.4x10-6/K
  • Refractive Index: 1.755@1um
 
Silicon
 
Silicon is a good IR material , it can be used from 1.2 to 7 microns, its peak transmission range is in 3-5 micron. Silicon can be used in some circumstances where weight is a concern as that the density of Silicon is similar to optical glass. Silicon material is widely used in security and military applications.
  • Transmission Range: 1200 nm~7000 nm
  • Thermal Expansion Coefficient: 2.55x10-6/K
  • Density: 2.33g/cm3
 
Germanium
 
Germanium is widely used in far infrared wavelength, it is transparent from 2 micron to 17 micron. Germanium also has higher refractive index about 4 at 10.6 micron. Germanium is very popular in FLIR and imaging applications.
  • Transmission Range: 2000 nm~17000 nm
  • Thermal Expansion Coefficient: 5.5x10-6/K
  • Density: 5.33g/cm3
 
Zinc Selenide
 
ZnSe is a material for production of optical window and lens for IR range. It is transparent from 0.5 micron to 19 micron. It is mainly used in CO2-laser application for its excellent imaging characteristics and high resistance to thermal shock.
  • Transmission Range: 500 nm~19000 nm
  • Thermal Expansion Coefficient: 7.6x10-6/K
  • Density: 5.27g/cm3
 
Note: Other optical material can also be provided by Union Optic, please contact us for details.