Potassium Bromide(KBr) window
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Potassium Bromide(KBr) optical window |
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Material |
Single crystal of Potassium Bromide(KBr), High Purity >99.99% |
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Other Names |
Potassium Bromide window, KBr window |
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Crystal structure |
Cubic |
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Applicable wave band |
0.25μm ~ 25μm |
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Refractive Index |
1.525 at 10μm, Nd=1.49025 |
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Melting Point |
730℃ |
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Density |
2.753g / cc |
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Absorption coefficient |
3×10-6 @ 1064nm；14×10-6cm-1 @ 10.6μm |
| Thermal Conductivity |
4.816 W/mK @ 319K |
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Thermal expansion coefficient |
43×10-6 /°K @ 300K |
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Knoop hardness |
7 in <100> |
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Dielectric constant |
4.9 at 1MHz |
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Young's modulus |
26.8 GPa |
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Shear modulus |
5.08 GPa |
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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 φ100mm 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<30nm or Ra<10nm
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, (scratch-dig)
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.
Contact Us
- BIOTAIN CRYSTAL CO., LIMITED
- Tel: (+86) 1506 0796 451
- Fax: (+86) 0597 2212602
- Email: sales@crystal-material.com
- Work Time ( GMT +8 ):
- 9 AM ~ 6 PM, Monday to Friday
- Main office: A7, No. 501, Denggaoxi Road, Xipi street, Xinluo District, Longyan, Fujian, China
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