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Potassium Bromide (KBr). KBr windows and beamsplitters

Alkor Technologies - Russian manufacturer of KBr optical components. We supply KBr windows, KBr wedges, KBr beamsplitters and KBr blanks according to customer's specifications.

The largest diameter of KBr optics is 140mm. Please contact us for more information.

KBr windows catalog. New!

KBr transmission. Sample thickness 10mm

KBr transmittance. Sample thickness 10mm.

Potassium Bromide is used for windows and prisms when transmission through the range 0.25mkm to 26mkm is desired. Potassium Bromide is water soluble and KBr windows must be protected against moisture degradation of polished surfaces. Alkor provides special anti-moisture coating to protect Kbr optics. KBr windows cleaves readily, and can be used at temperatures up to 300C. Irradiation of Potassium Bromide produces color centers.

Chemical Formula

KBr
Molecular Weight 119.01

Crystal Class

Cubic

Lattice Constant, Å

6.60

Density, g/cm3 at 300 K

2.75

Absorption Coefficient, 1/cm
at 2.7 µm
at 3.8 µm
1.2 x 10-4
1.6 x 10-4
Reflection Loss for two surfaces at 10 µm, % 8.4
Dielectric Constant
for 102-1010 Hz at 298 K
for 102-1010 Hz at 360 K
4.9
4.97
Melting Temperature, K 1000
Thermal Conductivity, W/(m K) at 319 K 4.8
Thermal Expansion, 1/K at 300 K 38.5 x 10-6
Specific Heat, cal/(g K) at 273 K 0.104
Debye Temperature, K 174
Bandgap, eV 7.6
KBr Solubility, g/100 g H2O at 273 K 53.48

Knoop Hardness, kg/mm2

7.0 [100]
Young's Modulus, GPa 26.87
Rupture Modulus, GPa 0.0039
Shear Modulus, GPa 5.08
Bulk Modulus, GPa 15.02
 KBR Refractive Index

Wavelength, µm

0.39

0.44

0.49

0.59

0.80

1.50

8.50

12.0

17.0

18.1

20.5

22.0

23.9

25.2

Refractive Index

1.59

1.58

1.57

1.56

1.55

1.54

1.53

1.52

1.51

1.50

1.49

1.48

1.47

1.46
Tel: +7(812)361240 Fax: +7(812)3631239 Email: technologies@alkor.net