Material - Sodium Chloride (NaCl)
Sodium Chloride is used for windows, lenses and prisms where transmission in the 0.25 µm - 16 µm range is desired.
Sodium Chloride is used for windows, lenses and prisms where transmission in the 0.25 µm - 16 µm range is desired. Because of its low absorption, Sodium Chloride is being used in high power laser systems. Sodium Chloride is produced in large ingots by the Kyropoulos growth method. It cleaves easily. With care it can be polished to a high standard under humidity controlled conditions. Polished surfaces must be protected from moisture by exposing them to only dry atmosphere or by using a heating element to keep the surfaces above ambient temperature. Sodium Chloride can be used at temperatures up to 400 °C. The material is sensitive to thermal shock. Irradiation generates color centers.
BASE PROPERTIES
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PARAMETER |
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VALUE |
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| OPTICAL |
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Transmission Range |
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0.2 to 15 microns |
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Refractive Index |
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1.49065 at 11 microns |
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Reflection Loss |
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7.6% at 10.6 µm (2 surfaces) |
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dn/dT |
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-40.83 x 10-6/K |
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Index of Absorption |
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1.64 x 10-4 cm-1 at 2.7µm |
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| PHYSICAL |
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Density |
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2.17 g/cm3 |
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Melting Point |
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801° C |
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Thermal Conductivity |
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1.15Wm-1K-1 at 273K |
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Thermal Expansion |
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44 x 10-6/K |
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Hardness |
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Knoop 18.2 in <100> with 200g indenter |
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Specific Heat Capacity |
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854 J/(kg K) |
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Dielectric Constant |
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5.9 at 1MHz |
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Young's Modulus (E) |
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39.98 GPa |
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Shear Modulus (G) |
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12.61 GPa |
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Bulk Modulus (K) |
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24.42 GPa |
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Elastic Coefficients |
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C11 = 48.5 C12 = 12.3 C44 = 12.61 |
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Apparent Elastic Limit |
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2.4 MPa (350 psi) |
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Poisson Ratio |
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0.252 |
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| CHEMICAL |
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Solubility |
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35.7g/100g water at 273K |
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Molecular Weight |
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58.45 |
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Class/Structure |
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Cubic FCC, NaCl, Fm3m, (100) cleavage |
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REFRACTIVE INDEX
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Wavelength, µm |
0.35 |
0.46 |
0.68 |
1.25 |
4.50 |
7.30 |
9.50 |
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Refractive Index |
1.58 |
1.56 |
1.54 |
1.53 |
1.52 |
1.51 |
1.50 |
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Wavelength, µm |
10.6 |
12.0 |
13.1 |
14.2 |
15.1 |
16.0 |
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Refractive Index |
1.49 |
1.48 |
1.47 |
1.46 |
1.45 |
1.44 |
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Delivery
Maximum available size: 300 mm Dia x 50 mm Thk
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