Calcium Fluoride/Magnesium Fluoride Window
Calcium fluoride, written GaF₂ in the opening, and magnesium fluoride (MgF₂) are described as hard, impact- and thermal-shock-resistant crystals with good UV, source-described kejiang light, and IR transmission. They serve lasers, IR/UV optics, and high-energy detectors, with high UV transmission and little fluorescence for UV photodetectors, lasers, and systems. Unlike source-written calcium fluoride (GaF₂), MgF₂ is birefringent. Calcium fluoride (CaF₂) transmits broadly from vacuum UV to IR, particularly 0.13-11.3 um, reaching 95%. No birefringence, stable mechanics, resistance to moisture deterioration and radiation damage suit windows, prisms, lenses, laser crystals, and quality microscope achromats. MgF₂ covers 0.12-10 um, resists moisture, and has index around 1.38, suiting laser/IR windows and substrates. It is an important low-index UV window material and is also used for solar-cell AR/protective coatings, medical antibacterial applications, and catalysis.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Machinable Shapes | Circular, Rectangular, Polygonal and Other Shapes |
| Size Range - Diameter (Maximum Diagonal) | Φ8-Φ80mm |
| Size Range - Thickness | 0.05-50mm |
| Surface Figure PV | Reflected PV Better Than 1/4λ, Transmitted PV Better Than 1/10λ |
| Surface Finish | 10-5 20-10 40-20 |
| Surface Roughness | Less Than 5nm |
| Parallelism | Less Than 20″ |
| Coating | Coating Customizable to Customer Requirements |
| Density [Calcium Fluoride (GaF2)] | 3.18 g/cm3 |
| Density [Magnesium Fluoride (MgF2)] | 3.177 g/cm3 |
| Melting Point [Calcium Fluoride (GaF2)] | 1360 ℃ |
| Melting Point [Magnesium Fluoride (MgF2)] | 1255 ℃ |
| Dielectric Constant [Calcium Fluoride (GaF2); 1HMZ] | 6.76@1HMZ |
| Dielectric Constant [Magnesium Fluoride (MgF2)] | 4.87@1HMZ (Parallel to C Axis), 5.44@1HMZ (Perpendicular to C Axis) |
| Chemical Purity [Calcium Fluoride (GaF2)] | 99.9996 % |
| Chemical Purity [Magnesium Fluoride (MgF2)] | 99.9996 % |
| Coefficient of Thermal Expansion [Calcium Fluoride (GaF2)] | 18.85*10⁻⁶ |
| Coefficient of Thermal Expansion [Magnesium Fluoride (MgF2)] | 13.7*10⁻⁶ (Parallel to C Axis), 8.48*10⁻⁶ (Perpendicular to C Axis) |
| Coefficient of Thermal Expansion [Calcium Fluoride (GaF2); 373K] | 7.3*10⁻⁶@373K |
| Coefficient of Thermal Expansion [Magnesium Fluoride (MgF2); 373K] | 7.0*10⁻⁶@373K |
| Thermal Conductivity [Calcium Fluoride (GaF2)] | 9.71 J/k.m.s |
| Thermal Conductivity [Magnesium Fluoride (MgF2); 27℃] | 0.3@27℃ |
| Heat Capacity [Calcium Fluoride (GaF2)] | 0.854 J/g.k |
| Heat Capacity [Magnesium Fluoride (MgF2); 298K] | 1.003@298K |
| Knoop Hardness [Calcium Fluoride (GaF2)] | 158.3 kg/mm² |
| Knoop Hardness [Magnesium Fluoride (MgF2)] | 415 kg/mm² |
| Shear Modulus [Calcium Fluoride (GaF2)] | 33.77 GPa |
| Shear Modulus [Magnesium Fluoride (MgF2)] | 15.66 GPa |
| Young's Modulus [Calcium Fluoride (GaF2)] | 75.8 GPa |
| Young's Modulus [Magnesium Fluoride (MgF2)] | 138.5 GPa |
| Poisson’s Ratio [Calcium Fluoride (GaF2)] | 0.26 |
| Poisson’s Ratio [Magnesium Fluoride (MgF2)] | 0.276 |
| Transmission Wavelength Range [Calcium Fluoride (GaF2)] | 130nm-10000nm |
| Transmission Wavelength Range [Magnesium Fluoride (MgF2)] | 110nm-7500nm |
| Refractive Index Inhomogeneity ΔN/N [Calcium Fluoride (GaF2); 632.8nm] | <3*10⁻⁶@632.8nm |
| Reflection Loss (2 Surfaces) [Calcium Fluoride (GaF2); 5000nm] | 5.4%@5000nm |
| Reflection Loss (2 Surfaces) [Magnesium Fluoride (MgF2)] | 11.2%@120nm; 5.1%@1000nm |
| Thermo-Optic Coefficient dn/dT [Calcium Fluoride (GaF2)] | -10.6*10⁻⁶ |
| Thermo-Optic Coefficient dn/dT [Magnesium Fluoride (MgF2); 400mnm] | 2.3*10⁻⁶@400mnm |
| GaF2 - Refractive Index (n) [190nm] | 1.51 |
| GaF2 - Refractive Index (n) [2650nm] | 1.42 |
| GaF2 - Refractive Index (n) [210nm] | 1.49 |
| GaF2 - Refractive Index (n) [3900nm] | 1.41 |
| GaF2 - Refractive Index (n) [250nm] | 1.47 |
| GaF2 - Refractive Index (n) [5000nm] | 1.40 |
| GaF2 - Refractive Index (n) [330nm] | 1.45 |
| GaF2 - Refractive Index (n) [6200nm] | 1.38 |
| GaF2 - Refractive Index (n) [410nm] | 1.44 |
| GaF2 - Refractive Index (n) [7000nm] | 1.36 |
| GaF2 - Refractive Index (n) [880nm] | 1.43 |
| GaF2 - Refractive Index (n) [8220nm] | 1.34 |
| MgF2 - Refractive Index 1 (n) [200nm] | 1.42 |
| MgF2 - Refractive Index 2 (n) [200nm] | 1.43 |
| MgF2 - Refractive Index 1 (n) [230nm] | 1.41 |
| MgF2 - Refractive Index 2 (n) [230nm] | 1.42 |
| MgF2 - Refractive Index 1 (n) [270nm] | 1.40 |
| MgF2 - Refractive Index 2 (n) [270nm] | 1.41 |
| MgF2 - Refractive Index 1 (n) [340nm] | 1.39 |
| MgF2 - Refractive Index 2 (n) [340nm] | 1.40 |
| MgF2 - Refractive Index 1 (n) [560nm] | 1.38 |
| MgF2 - Refractive Index 2 (n) [560nm] | 1.39 |
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Datasheet
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