CF Flanged Sapphire Viewports

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 High purity Sapphire viewports offer a hermetically-sealed lens with upgraded optical, mechanical, and corrosion properties across a wide spectrum. Innovacera’ Sapphire viewports are rated for both high vacuum(HV) and ultrahigh vacuum(UHV) applications.

The use of high purity sapphire and low expansion alloys allow these viewports to be repeatedly baked out at temperatures up to 350°C. The crystal orientation of our sapphire viewports is normal to the optical axis, also referred to as a 90° orientation. All viewports up to one-inch in diameter are made with UV grade sapphire.

Flanged Sapphire Viewports

Specifications:

–Materials
Flange304 Stainless Steel
Glass SubstrateSapphire
SealVacuum Brazed

Features:

  • Single-crystal Sapphire
  • Positioning/direction: 0-90°
  • Ultraviolet and regular grades
  • Optically polished substrate faces
  • UHV compatible construction
  • High Temperature rated to 350°C
  • Stainless steel / NiFe construction
  • Custom Solutions By Customer Request

Sapphire Properties：

PropertyValue
Chemical FormulaSapphire(99.99%Al2O3)
Mechanical
Density3.97 gm/cc
Hardness22.5 GPa
Modulus of Elasticity470 GPa
Flexural Strength690 MPa
Compressive Strength2940 MPa
Poisson’s Ratio–
Fracture Toughness–
Electrical
Dielectric Strength48 ac V/mm
Dielectric Constant9.3 (@ 1 MHz)
Volume Resistivity10^14 ohm-cm
Dielectric Strength48 ac V/mm
Thermal
Coefficient of Thermal Expansion5.3 x 10^-6/°C
Thermal Conductivity41 W/(m*K)
Specific Heat0.75 x10^3 J/(Kg*K)
Shock Resistance–
Maximum Working Temperature1900 °C
Optical
Index of Refraction1.762
Birefringence–
Transmission Band–

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