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Home > Products > Sapphire Viewport > Sapphire Vacuum Viewport Glass
Sapphire Vacuum Viewport Glass

The vacuum observation window is a welding adapter (-W), fast-connected flange (-QF/KF) or CF flange to seal the planar parallel window with stainless steel. This assembly is used to import/export the transmission of electromagnetic radiation into a sealing system. At present, several standard materials have covered many common transmission ranges and applications. Optical coatings can enhance and optimize the transmission of observation windows, and the standard configuration of observation windows is a narrow/wideband anti-reflective coating.


Vanrun OE provides a variety of customized sapphire vacuum viewport glass and specifications are as follows:

Specifications of Sapphire Vacuum Viewport Glass:

Material:

CZ, KY, HEM monocrystal sapphire

Dimension Range:

Dia. 12mm to 200mm

Dimension Tolerance:

+/-0.05mm, +/-0.1mm

Thickness Range:

2 to 20mm

Thickness Tolerance:

+/-0.05mm

Surface Quality:

60-40, 40-20 (MIL13830)

Surface Accuracy:

up to 1/4 lambda per inch @633nm

Parallelism:

1 arc min

Chamfer:

protective, 0.2 to 0.5x45 Degree

Coating:

no coating or AR coating

Proterties of sapphire crystal:
Physical and optical proterties

Transimission Range0.17 to 5.5um
Refractive IndexNo 1.75449; Ne 1.74663 @ 1.06um
Reflection Loss14% @ 1.06um
Absorption Coefficient0.3 x 10-3cm-1 @2.4um
Reststrahlen Peak13.5um
dn/dT13.1x10-6 @ 0.546um
dn/du = 01.5 um
Density3.97 g/cc
Melting Point2040 
Thermal Conductivity27.21 W m-1 K-1 @ 300K
Thermal Expansion5.6 (para) & 5.0 (perp) x 10-6/K
HardnessKnoop 2000 with 2000g indenter
Specific Heat Capacity763 J Kg-1 K-1 @ 293K
Dielectric Constant11.5 (para) 9.4 (perp) @ 1MHz
Youngs Modulus (E)335 GPa
Shear Modulus (G)148.1 GPa
Bulk Modulus (K)240 GPa
Elastic CoefficientsC11=496 C12=164 C13=115 C33=498 C44=148
Apparent Elastic Limit300MPa （45,000 psi)
Poisson Ratio0.25
Solubility98x10-6g/100g water
Molecular Weight101.96
Class/StructureTrigonal (hex), R3c