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Potassium Bromide(KBr) window

Potassium Bromide(KBr) window


Potassium Bromide(KBr) optical window

Material

 Single crystal of Potassium Bromide(KBr),  High Purity >99.99% 

Other Names

Potassium Bromide window, KBr window

Crystal structure

Cubic

Applicable wave band

0.25μm ~ 25μm

Refractive Index

1.5μm  at 10μm

Melting Point

730℃

Density

2.753g / cc

Absorption coefficient

3×10-6 @ 1064nm;14×10-6cm-1 @ 10.6μm
Thermal Conductivity

4.816 W/mK @ 319K

Knoop hardness

7 in <100>

Dielectric constant

4.9 at 1MHz

Thermal expansion coefficient

43×10-6 /°K @ 300K

Maximum size

 Diameter 100mm (Single crystal)

Material Standard Size Surface quality
Potassium Bromide(KBr) window φ12.7mm x 3.0mm
φ25.4mm x 3.0mm
φ25mm x 5.0mm
φ50mm x 5.0mm
φ50.8mm x 5.0mm
10 x 10 x 1.0mm
12.7 x 12.7 x 3.0mm
25.4 x 25.4 x 3.0mm
Polishing:             Double side optical polished or Epi-polished
Roughness:          Ra<10nm or others
Size Tolerance:          +/-0.1mm
Thickness Tolerance: +/-0.1mm or +/-0.05mm
Parallelism:           1 minute, 30 seconds, 5 seconds or higher
Surface Finish:      80-50, 60-40, 40-20, 20-10 or others
Surface Figure:      1/2λ, 1/4λ or higher
Chamfer:                0.25mm × 45°
Coating:                 Upon requirements

Potassium Bromide(KBr) is the most commonly used spectrophotometer for IR spectrophotometers. It is commonly used in FTIR spectroscopy. Potassium Bromide window has a larger spectral band range than Sodium Chloride window, and has excellent transmission between 250nm-26μm. Within this range, its refractive index is between 1.46-1.59. Potassium Bromide is water-soluble, so its surface should not be in contact with moisture. Potassium Bromide windows have good resistance to mechanical shock and can be used at high temperatures of 300 °C. KBr window is one of the most useful materials for general purpose spectral windows and applications that have no significant effect on humidity sensitivity. 
 
We can customize different size and thickness of Potassium Bromide(KBr) optical window upon requirements, such as Potassium Bromide(KBr) round wafer, Square substrate and Cylinder, or Punch holes and other shapes.
 
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Contact Us

  • Biotain Crystal Co., Ltd.
  • Tel: (+86) 1506 0796 451
  • Fax: (+86) 592 523 6275
  • Email:
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  •    9 AM ~ 6 PM, from Monday to Friday
  • Main office: NO. 254, Hubin North Road, Xiamen City, Fujian Province, China