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Home > Products > Windows > Large Sapphire Windows

Large Size Sapphire Windows

● up to Diameter 300mm external dimensions

● deep optical polishing and good surface accuracy

Vanrun OE can provide large size sapphire windows. The external dimensions up to Diameter 300mm circular window or 300x300 mm square window. Even with such a large size, these windows still have good surface quality and flatness.These large sapphire windows are commonly used in high-power lighting, aerospace, laboratory instruments and many other high-tech fields. Various optical coatings are abaliavle upon request.

Features：

  • ~Dia.300mm or 300x300mm, hickness according to the specific requirements.
  • ~40-20 S/D and 1/2 lambda per 25mm @633 over clear aperture
  • Various optical coatings are avaliable upon request


Transmission curve of sapphire window:

(no coating, @3-5um)

Specifications of sapphire windows:

Material:

CZ, KY, HEM monocrystal sapphire

Dimension Range:

up t0 Dia. 300mm, or 300x300mm

Dimension Tolerance:

+/-0.1mm, +0/-0.2mm

Thickness Range:

>2mm, according to the specific requirements

Thickness Tolerance:

+/-0.1mm

Surface Quality:

60-40, 80-50 (MIL13830)

Surface Accuracy:

up to 1/2 lambda per 25@633nm over C.A.

Parallelism:

1 arc min

Chamfer:

protective, 0.5x45 Degree

Coating:

avaliable upon request

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

Typical applications:

  • Industrial and Medical OEM’s
  • Air and Gas Analyzers/Monitors
  • High Intensity Xenon Lamps
  • Cryogenic View Ports
  • UV and IR Windows and Lenses
  • Detector and Pressure Cells
  • Photodiodes
  • Bar Code Readers