Fused Silica IR Grade (SiO2)

Optical

Refractive Index at ne	1.4601
Refractive Index at nF' - nC'	0.0068
Refractive Index at nD	1.4584
Refractive Index at nF - nC'	0.0068
Thermal Coefficient of Refractive Index at nC microns for +20 °C	100 x 10-7
Transmission Range, microns	0.18 - 3.5

 

Thermal

Thermal Linear Expansion, °C-1 for ±50 °C	4.0 x 10-6
Thermal Conductivity, W/(m * °C) at 20 °C	1.35
Specific Heat Capacity, J/(kg * °C)	0.728 x 103
Melting Point, °C	1900

 

Mechanical

Density, g/cm3 at 20 °C	2.21
Young Modulus (E), Pa	7.36 x 1010;
Shear Modulus (G), Pa	3.14 x 1010
Poisson Ratio	0.17

 

Chemical

Solubility
in water, gram/100 cm3	insoluble
in acids	insoluble

 

Ref. Index vs. Wavelength l

Wavelength, Microns	Refractive Index
0.1700	1.615
0.1850	1.575
0.2000	1.550
0.2144	1.5337
0.2803	1.4940
0.3021	1.4872
0.3650	1.4745
0.4046	1.4696
0.4358	1.4666
0.5461	1.4601
0.5876	1.4585
0.5893	1.4584
0.6438	1.4567
0.6563	1.4564
0.8621	1.4525
1.0830	1.4494
1.3950	1.4458
1.7091	1.4421
2.0581	1.4372
3.2439	1.4131

 

Internal Transmittance t i (l) vs. Wavelength l

Wavelength, Microns	Internal Transmittance
0.220	0.220
0.230	0.435
0.240	0.525
0.260	0.800
0.270	0.930
0.280	0.999
0.700	0.999
1.000	0.999
1.500	0.999
2.000	0.999
2.720	0.999
2.800	0.955
2.900	0.900
3.000	0.870
3.750	0.180

Custom sizes and specifications are available on request.