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Home > Products > Materials

Optical Materials, Crystals

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arrowGeneral optical glass: SCHOTT or equivalent, Chinese optical glass
arrowSpecial glass, Functional Glass: Fused Silica, Colored glass, borosilicate glass, Float glass
arrowCrystal: Sapphire, Quartz, Germanium, Silicon, Ruby, ZnSe, CaF2, MgF2, etc.


sapphire-ingot
germanium-ingot
fused-silica-ingot
CZ Sapphire Monocrystal
Germanium Monocrystal
Fused Silica
     
znse-crystal
silicon-ingot
caf2-crystal
ZnSe CVD
Silicon Monocrystal
CaF2

arrowProterties of sapphire crystal:
Physical and optical proterties
transimission Range 0.17 to 5.5um
Refractive Index No 1.75449; Ne 1.74663 @ 1.06um
Reflection Loss 14% @ 1.06um
Absorption Coefficient 0.3 x 10-3cm-1 @2.4um
Reststrahlen Peak 13.5um
dn/dT 13.1x10-6 @ 0.546um
dn/du = 0 1.5 um
Density 3.97 g/cc
Melting Point 2040 
Thermal Conductivity 27.21 W m-1 K-1 @ 300K
Thermal Expansion 5.6 (para) & 5.0 (perp) x 10-6/K
Hardness Knoop 2000 with 2000g indenter
Specific Heat Capacity 763 J Kg-1 K-1 @ 293K
Dielectric Constant 11.5 (para) 9.4 (perp) @ 1MHz
Youngs Modulus (E) 335 GPa
Shear Modulus (G) 148.1 GPa
Bulk Modulus (K) 240 GPa
Elastic Coefficients C11=496 C12=164 C13=115 C33=498 C44=148
Apparent Elastic Limit 300MPa (45,000 psi)
Poisson Ratio 0.25
Solubility 98x10-6g/100g water
Molecular Weight 101.96
Class/Structure trigonal (hex), R3c


arrowProterties of UV Fused Silica:
transimission Range 0.18 to 2.5um
Refractive Index 1.46
Water absorption - saturation (%) 0
Volume resistivity (Ohm.cm) 1018@25 C
Compressive strength (Mpa) 1100
Density 2.202 g/cm3
Melting Point 1715
Thermal Conductivity 1.46 W m-1 K-1 @ 20 C
Themal Expansion Coefficient a = 0.54 x 10-6/K
Specific heat (J/K/kg) 670-740 @ 25 C 
Hardness - Knoop (kgf/mm2) 820
Hardness - Vickers (kgf/mm2) 1000
Hardness - Mohs 7
Thermo-Optic Coefficients dn/dT= 1.0 x 10-5 /oC
Optical Homogeneity delta n < 10-6 /cm
Dielectric strength 25-40 kV/mm
Dielectric constant 3.8
Shear strength 70 MPa
Tensile modulus 72-74 GPa
Tensile strength 48 Mpa
Apparent porosity (%) 0
Upper continuous use temperature 1100-1400 C


arrowProterties of germanium crystal:

Physical and optical proterties

transimission Range 1.8 to 23um
Refractive Index 4.0026 @ 11um
Reflection Loss 53% @ 11um
Absorption Coefficient <0.027 cm-1 @ 10.6um
Reststrahlen Peak N/A
dn/dT 396 x 10-6 /°C
dn/du = 0 almost constant
Density 5.33 g/cc
Melting Point 936°C
Thermal Conductivity 58.61 W m-1 K-1 @ 293K
Thermal Expansion 6.1 x 10-6/°C @ 298K
Hardness Knoop 780
Specific Heat Capacity 310 J Kg-1 K-1
Dielectric Constant 16.6 @ 9.37GHz @300K
Youngs Modulus (E) 102.7 GPa
Shear Modulus (G) 67 GPa
Bulk Modulus (K) 77.2 GPa
Elastic Coefficients C11=129 C12=48.3 C44=67.5
Apparent Elastic Limit 89.6MPa (13,000 psi)
Poisson Ratio 0.28
Solubility insoluble in water
Molecular Weight 72.59
Class/Structure Cubic Diamond, Fd3m

* For more information or other materials and requests, please contact us.


 
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