Optics, Optical components, Crystals

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Optical Materials, Crystals

General optical glass: SCHOTT or equivalent, Chinese optical glass
Special glass, Functional Glass: Fused Silica, Colored glass, borosilicate glass, Float glass
Crystal: Sapphire, Quartz, Silicon, Ruby, ZnSe, CaF2, MgF2, etc.

CZ Sapphire Monocrystal	Ruby	Fused Silica
ZnSe CVD	Silicon Monocrystal	CaF2

Properties of sapphire crystal:

Physical and optical properties
transmission 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

Properties of UV Fused Silica:

transmission 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