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BaF2 substrate, window

BaF2 substrate, window


The main performance parameters

Crystal structure


Lattice constants

6.19 Å  


4.88 (g/cm3)

Melting point


Growth method


Mohs hardness


Coefficient of thermal expansion


Refractive index

No=1.474; ne=1.450

Transmission band


Cleavage plane


Standard orientation

<100>, <111>

Standard size

Dia 1", Dia 2", 10x10mm, 20x20mm

Standard thickness

0.5mm, 1.0mm, 2.0mm, 5.0mm

Surface roughness

Ra<5A (5um × 5 um)

BaF2 application

IR and UV window, prism and substrate


Single or double side polished


Class 100 clean bag, 1000 clean room


Barium fluoride (BaF2) crystal belongs to cubic crystal system, good moisture resistance, melting point 1280 °C, high using temperature, the refractive index does not change much in a wide wavelength range and with a wide of light transmission range. The highest transmittance can reach  >90% in the wavelength range of 0.2μm to 10μm. BaF2 crystal has good optical and mechanical properties.


In addition, BaF2 crystals also have excellent scintillation properties (due to their fast and slow 2 luminescence components, the crystal can simultaneously measure energy spectrum and time spectrum, Moreover, the energy resolution and time resolution are relatively high. ), so the BaF2 has broad application prospects in the fields of high energy physics, nuclear physics and nuclear medicine.

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