KBr
Potassium Bromide (KBr) crystal is water-souble, and it is easily deliquescent. That cannot be chemically polished. It has a high transmittance and a wide pass band, so it’s commonly used for transmission windows, FTIR spectrophotometers and beam splitters for spectrophotometers. The KBr substarte and windows are soft and Hygroscopic. KBr single crystal uniform texture and transparent, has a high infrared transmittance, the transmittance greater than 90% when thickness less 10mm and in the range of 4000-500cm-1, no impurity absorption. KCI single crystal as a laser window material, the optical performance is excellent.
Parameter
| Orientation | <100>, <110>, <111> |
| Orientation Tolerance | < 0.5° |
| Parallelism | 5〞 |
| Perpendicularity | 3ˊ |
| Surface Quality | 10-5 (Scratch/Dig) |
| Wavefront Distortion | <λ/4@632 nm |
| Surface Flatness | <λ/8 @632 nm |
| Clear Aperture | >90% |
| Chamfer | <0.1×45° |
| Thickness/Diameter Tolerance | ±0.05 mm |
| Crystal Structure | Cubic |
| Symmetry Class | m3m |
| Lattice Constants | 6.598 |
| Specific Mass | 2.75 g/cm3 |
| Melting Point | 728°C |
| Cleavability | (100), perfect |
| Thermal Conductivity /(W·m-1·K-1@46°C) | 4.81 |
| Specific Heat (J·kg-1·K-1) | 452.2 |
| Thermal Expansion(10-6·K-1@60°C) | 36.6 …39.6 |
| Hardness (Mohs) | 1.5 |
| Vickers Microhardness(GPa) | 0.1 |
| Constant of Elastic Compliance(10-12·Pa-1) | S11=30.29, S12=-4.18, S44=194.92 |
| Young Modulus (GPa) | 33.0@<100>, 13.8@<111> |
| Shear Modulus (GPa) | 9.0@<100>, 5.1@<111> |
| Transmission Range | 0.21 … 28.0µm |
| Refractive Index | 1.5251@10.6µm |
| Thermo-optic Coefficient(10-6·K-1@60°C,3.4µm) | -0.395 … -0.429 |
| Poisson Ratio | 0.138 |
| λ(μm) | n | λ(μm) | n | λ(μm) | n |
| 0.2 | 2.0995 | 5 | 1.5334 | 11 | 1.5217 |
| 0.5 | 1.57 | 6 | 1.5319 | 12 | 1.5204 |
| 1 | 1.5444 | 7 | 1.5303 | 15 | 1.4403 |
| 2 | 1.5383 | 8 | 1.5285 | 20 | 1.3822 |
| 3 | 1.5357 | 9 | 1.5265 | 30 | 1.0912 |
| 4 | 1.5346 | 10 | 1.5242 | ||
Feature
- Wide-band good conductor
- Water-soluble, easy to deliquesce and cannot be chemically polished
- Can grow epitaxial films on a featureless substrate
- Good resistance to mechanical shock
Application
- Substrate for Epitaxial growth
- Be used in the production of infrared spectroscopy analyzer
- Ultraviolet and infrared optical components
- Prisms, lenses, filters and various laser windows, infrared devices, optical, laser crystal instruments
Reference
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