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Sapphire Prisms

  • Large wavelength range: 0.15~5μm
  • Extreme hardness for harsh environment
  • Chemical and erosion resistant front surface
  • Various prism shapes: Right angle prisms, 60° equiliateral dispersing prism, and custom
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Shapes Right angle prisms, 60° equiliateral dispersing prism,
customized prisms
Materials Optical grade single crystal sapphire
Aperture >90% Dimension Tolerance +0.0/-0.2mm
Thickness Tolerance +/-0.2mm Surface Quality 40/20 S/D
Flatness 1Lambda@633nm


Physiccal and Optical Properties:

Transmission Range 0.17 to 5.5 μm Refractive Index No 1.75449; Ne 1.74663 @ 1.06 μm
Reflection Loss 14% at 1.06 μm Absorption Coefficient 0.3 x 10-3  cm-1  @ 2.4 μm
Reststrahlen Peak 13.5 μm dn/dT 13.1 x 10-6  @ 0.546 μm
dn/dμ = 0 1.5 μm Density 3.97 g/cc
Melting Point 2040°C 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
Apparent Elastic Limit 300 MPa (45,000 psi) Poisson Ratio 0.25
Solubility 98 x 10-6  g/100g water Molecular Weight 101.96
Class/Structure Trigonal (hex), R3c

Optical Prisms are transparent optical elements with flat, polished surfaces that refract or reflect light. Optical prisms could be utilized for beam deviation and adjusting the orientation of an image.

Due to their great surface hardness (ranks a 9 on the Mohs scale), high thermal conduction, and tolerance to general chemical acids and alkalis, single crystal sapphire (Al2O3) prisms are the top performer in demanding applications in various industries (such as lasers) and harsher climates (e.g. vacuum, high heat, corrosive atmosphere). Because of the superb structural strength of sapphire, Sapphire Prisms can be produced far more compact than those made of other popular materials. Sapphire has good transmittance between 0.15 and 5.5 m, which covers the UV to MWIR wavelength range.

Hangzhou Shalom EO offers customized prisms upon customers' request. The prism shapes include right angle prisms, 60°equilateral dispersing prisms, and other custom shapes (e.g. dove prisms, Penta prisms, roof prisms, rhomboid prisms.)