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Barium fluoride(BaF2) window

Barium fluoride(BaF2) window

Barium fluoride(BaF2) optical window


 Single crystal of Barium fluoride(BaF2)
 Polycrystalline of Barium fluoride(BaF2)
 Purity: >99.99%

Other Names

Barium fluoride window, BaF2 window, BaF2 wafer, BaF2 plate

Applicable wave band

0.15um ~ 12.5um

Refractive Index
(0.2 μm ~ 12 μm)


Melting Point

Thermal Conductivity

11.72 W/K.m

Kirschner Hardness

82 with 500g indenter

Elasticity Coefficient


Thermal expansion coefficient

18.1 x 10-6∕℃

Maximum size

 Diameter 50.8mm (Single crystal)
 Diameter 200mm (Polycrystalline)

Material Standard Size Surface quality
Barium fluoride(BaF2) window

(Single crystal window) or
(Polycrystalline window)
φ5.0mm x 1.0mm
φ25mm x 1.0mm
φ25.4mm x 2.0mm
φ50mm x 3.0mm
φ50.8mm x 1.0mm
φ50.8mm x 6.0mm
φ90mm x 3.5mm
φ100mm x 3.0mm
10 x 10 x 1.0mm
20 x 20 x 2.0mm
Or others
Polishing:             Double side optical-polished or CMP-polished
Roughness:          Ra<1.5nm or Ra 5~10nm, Ra<0.5nm, 
Size Tolerance:          +/-0.1mm
Thickness Tolerance: +/-0.1mm or +/-0.05mm
Parallelism:           1 minute, 30 seconds, 5 seconds or higher
Surface Finish:      60-40, 40-20, 20-10 (scratch-dig)
Surface Figure:      1/2λ, 1/4λ or higher
Chamfer:                0.25mm × 45°

Barium fluoride(BaF2) window has good light transmission performance in the wavelength range of 0.15μm~12.5μm. Barium fluoride(BaF2) is an ideal material for making various optical components such as IR/UV optical windows, prisms, and lenses. Can be used for infrared distribution cabinet windows, Fourier gas analysis windows, oil and gas detection, high power lasers, optical instruments, etc. The performance of single crystal and polycrystal is basically the same,
Barium fluoride(BaF2) has excellent scintillation properties and has become an important crystalline material in the fields of high-energy physics and nuclear physics, nuclear medicine and other fields.

We can customize different size and thickness of Barium fluoride(BaF2) optical window upon requirements, such as Barium fluoride(BaF2) round wafer, Square substrate and Cylinder, or Punch holes and other shapes.
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Contact Us

  • Tel: (+86) 1506 0796 451
  • Fax: (+86) 0597 2212602
  • Email:
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  •    9 AM ~ 6 PM, Monday to Friday
  • Main office: A7, No. 501, Denggaoxi Road, Xipi street, Xinluo District, Longyan, Fujian, China