Nonlinear Crystals

Introduce

Nonlinear Crystals

Laser Crystals

AO & EO Crystals

Optical Crystals

  YAG

  YVO4

  -BBO

  Quartz

  Sapphire (Al2O3)

  Spinel (MgAl2O4)

  Calcite (CaCO3)

  Magnesium Fluoride (MgF2)

  Calcium Fluoride (CaF2)

  Lithium Fluoride (LiF)

  Barium Fluoride (BaF2)

  Zinc Sulphide (ZnS)

  Zinc Selenide (ZnSe)

  Gallium Arsenide (GaAs)

Zinc Selenide (ZnSe)

Zinc Selenide is used for optical windows, lenses, mirrors and prisms particularly for infrared applications. The transmission range is 0.5m - 22m. Used for high power CO2-laser optics at 10.6micronsZinc Selenide is produced by synthesis from zinc vapour and H2Se gas, forming as sheets on graphite susceptors. It is microcrystalline in structure, the grain size being controlled to produce maximum strength. Single crystal ZnSe is available, but is not common but has been reported as having lower absorption and thus more effective for CO2 optics.

Specifications of ZnSe
Transmission Range 0.6 to 21.0m
Refractive Index 2.4028 at 10m
Reflection Loss 29.1% at 10.6m (2 surfaces)
Absorption Coefficient 0.0005cm-1 at 10.6m
Restrahlen Peak 45.7microns
dn/dT +61 x 10-6/C at 10.6m at 298K
dn/d = 0 5.5m
Density 5.27g/cm3
Melting Point 1525C (dissociates about 700C)
Thermal Conductivity 18 W/(m K) at 298K
Thermal Expansion 7.1 x 10-6/ C at 273K
Hardness Knoop 120 with 50g indenter
Specific Heat Capacity 339 J kg-1 K-1
Bulk Modulus (K) 40 GPa
Young's Modulus (E) 67.2 GPa
Apparent Elastic Limit 55.1 MPa (8,000psi)
Poisson Ratio 0.28

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