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CRYLINK’s Cr:Al2O3 crystal products, also known as Ruby. It is a kind of laser crystal product with excellent comprehensive performance. It is widely used in optics and solid-state lasers. The product has the characteristics of high hardness and obvious dichroism. It can be used in optical glass, watch parts, and ruby laser products.

  • Hardness is high
  • Obvious dichromeity Solid

Basic Parameters

Chemical FormulaCr3+:Al2O3
Crystal Structure
Lattice Constant (Å)a = 4.748; c = 12.957
Crystal SystemTriangular
Axial PropertieUniaxial
Growth methodCZ
Melting Point2040℃
Refractive Indexnp = 1.759; n= 1.767
Density (g/cm3)3.98
Mohs Hardness9
Specific Heat Capacity @18℃ (J kg-1 K-1)761
Thermal Conductivity @25°C (W cm-1 K-1)
Perpendicular to the C axis0.35
Parallel to the C axis0.33
Thermal Expansivity (20 – 100°C)
Perpendicular to the C axis4.78×10-6 K-1
Parallel to the C axis5.31×10-6 K-1


Tuning Range (nm) 680 – 1100
Pump Range (nm)450 – 532
Absorption Coefficient @510 nm (cm-1)0.5 – 2.5
Orientation90° to c axis
Geometryflat-flat / Brewster
Orientation Tolerance< 5°
Wide-band AR coating (%)< 0.2
Dia (mm)(3 – 40) ± 0.1
Length (mm)(10 – 140) ± 0.5


Cr absorption spectrum of ruby
Cr absorption spectrum of ruby

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