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Material

CASTECH has strong capability in fabricating optical components with various optical material. The most important material properties to consider for an optical element are transmission versus wavelength, index of refraction, thermal characteristics, mechanical and chemical characteristics and cost.


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      CASTECH has strong capability in fabricating optical components with various optical material. The most important material properties to consider for an optical element are transmission versus wavelength, index of refraction, thermal characteristics, mechanical and chemical characteristics and cost.

      There are two instances in which you might need to know more about optical material. First, you may need to determine the performance of a catalog component in a particular application. Second, you may need specific information when selecting the material for a custom component. The data in the following is intended to assist in these situations.

      To select the right material seems overwhelming. The simplest way is to let CASTECH know your applications, and we select them for you.


Standard  Material that CASTECH uses include:


  Optical glass:                                 UV Fused Silica;N-BK7;Borofloat;SF2;  N-SF5… 

  Optical crystal:                               CaF2;Silicon;Ge;ZnSe;ZnS;YAG... 

  Birefringence material:                 MgF2 ; YVO4;  Quartz;  Calcite;  α-BBO;  Sapphire …    


MaterialRefractive IndexTransmission Range (μm)Thermal Expansion Coefficient (10-6/K)
UV fused silica1.4858 @308nm0.185-2.50.5
N-BK71.5164 @588nm0.330-2.17.1
Borofloat1.47311 @546.1nm0.32-2.83.25
SF21.64379 @633nm0.36-2.58.4
N-SF51.66848 @633nm0.40-2.57.9
MgF2no=1.3836;ne=1.3957 @405nm0.130-7.08.8∥c;13.1∥a
YVO4no=1.9500;ne=2.1554 @1.3μm0.400-5.011.37∥c;4.43∥a
Quartno=1.5427;ne=1.5518 @633nm0.200-2.36.88∥c;12.38∥a
Calciteno=1.6557;ne=1.4852 @633nm0.350-2.35.68∥c;24.39∥a
α-BBOno=1.6749;ne=1.5555 @532nm0.190-3.533.3∥c;0.5∥a
Sapphire1.755 @1.0μm0.180-4.58.4
CaF21.399 @5.0μm0.170-7.818.85
Silica3.4179 @10μm1.00-7.02.23
Ge4.003 @10μm2.00-235.7
ZnSe2.400 @10.6μm0.5-227.6
Silica3.416 @10.6μm1.5-74.5

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