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Manufacturer of KBr optical components: KBr windows (drilled and undrilled), KBr wedges and KBr beamsplitters according to customer's specifications. Moisture protective coating (Parylene analog) can be applied on all KBr windows.
The largest diameter of KBr optics is 100mm. Please contact Sales Team for more information.
Please visit our KBr windows catalog.
KBr transmittance. Sample thickness 10mm.
Potassium Bromide is used for windows, lenses and prisms when transmission through the range 0.25µm to 26µm is desired. Potassium Bromide (KBr) is a material commonly used in FTIR spectroscopy (drilled KBR windows). Potassium Bromide is water soluble and KBr windows must be protected against moisture degradation of polished surfaces.
Alkor provides special anti-moisture polymer coating - Parylene analog to protect KBr optics. KBr windows cleaves readily, and can be used at temperatures up to 300C. Irradiation of Potassium Bromide produces color centers.
Packing: All KBr optics carefully packaged into plastic boxes with silicagel and sealed with special moisture protective film.
|
| 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
| µm |
No |
µm |
No |
µm |
No |
| 0.405 |
1.5898 |
0.436 |
1.5815 |
0.486 |
1.5718 |
| 0.508 |
1.5684 |
0.546 |
1.5639 |
0.587 |
1.5600 |
| 0.643 |
1.5559 |
0.707 |
1.5524 |
1.014 |
1.5441 |
| 2.440 |
1.5373 |
3.419 |
1.5361 |
4.258 |
1.5352 |
| 6.238 |
1.5329 |
8.662 |
1.5290 |
9.724 |
1.5270 |
| 11.04 |
1.5240 |
14.29 |
1.5150 |
17.40 |
1.5039 |
| 19.91 |
1.4929 |
23.86 |
1.4714 |
25.14 |
1.4632 |
| 28.00 |
1.4423 |
30.00 |
1.4253 |
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