Potassium Chloride (KCl) is hygrosopic. The crystal often applied for infared transmission windows and FTIR spectrophotometers. The KCl windows have low refractive index and high threshold damage. So it’s very useful for sputter barrier windows in CO2 lasers. KCl 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 | 6.291 Å |
| Density | 1.989 g/cm3 |
| Melting Point | 776°C |
| Cleavability | (100), perfect |
| Thermal Conductivity /(W·m-1·K-1)@46°C | 6.53 |
| Specific Heat (J·kg-1·K-1) | 690 |
| Thermal Expansion(10-6·K-1@60°C) | 34.1 … 38.3 |
| Hardness (Knoop) | 7.2@<110>, 9.3@<100> |
| Vickers Microhardness (GPa) | 0.15 |
| Young’s Modulus (GPa) | 16.8@<110>, 38.2@<100> |
| Shear Modulus (GPa) | 6.3@<110>, 10.8@<100> |
| Bulk Modulus (GPa) | 17.36 |
| Rupture Modulus (GPa) | 4.41×10-3 |
| Elastic Coefficient (GPa) | C11=40.2, C12=6.7, C44=6.29 |
| Transmission Range | 0.21 … 30µm |
| Refractive Index | 1.488@0.6µm, 1.454@10.6µm |
| Reflective Loss | 6.8%@10.0µm |
| Reststrahlen | 63.1µm |
| Poisson Ratio | 0.134 |
| λ(μm) | n | λ(μm) | n | λ(μm) | n |
| 0.2 | 1.717 | 5 | 1.4703 | 11 | 1.4527 |
| 0.5 | 1.4968 | 6 | 1.4683 | 12 | 1.4463 |
| 1 | 1.4796 | 7 | 1.4659 | 12.5 | 1.446 |
| 2 | 1.4751 | 8 | 1.4632 | 15 | 1.4325 |
| 3 | 1.4735 | 9 | 1.4601 | 20 | 1.3947 |
| 4 | 1.472 | 10 | 1.4566 | 30 | 1.2626 |
Feature
- Wide-band good conductor
- Water-soluble, easy to deliquesce and cannot be chemically polished
- Can grow epitaxial films on a featureless substrate
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
- IR spectroscopy
- Windows for CO2lasers
- Protection windows for cutting lenses
Literature
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