Magnesium Fluoride(MgF2) Double-Concave Lenses
Magnesium fluoride has good transmittance in the ultraviolet, visible and infrared fields and is widely used in scientific and technical fields such as lasers, infrared optics, ultraviolet optics and high energy detectors. Compared to other materials, magnesium fluoride materials are particularly durable in the deep UV and far IR wavelength ranges.
Magnesium fluoride double-concave lenses are highly sought after for many UV and IR applications, and are particularly suitable for applications in the 200 nm - 6.0 μm wavelength range.
MgF2 double-concave lens is similar to a plano-concave lens in that the focal length is negative, but the light incident in parallel diverges outward. And it’s been widly used in optical systems,laser optical systems and infrared optical systems, such as ultraviolet spectrometer, ultraviolet detector, infrared spectrometer, infrared camera, laser device, LiDAR Etc.
Our Company can provide Magnesium Fluoride Double-Concave Lenses with diameters from 2-300mm and thicknesses from 0.12-60mm (accuracy up to 20-10, 1/10L@633nm),coating AR, BBAR, AF or upon request.
Technical parameters of MgF2 Double-Concave Lens
Diameter | 2-300mm |
Focal length | 15-5000mm |
Thicknesses | 0.12-60mm |
Dimension tolerance | +0/-0.1mm |
Thickness tolerance | ±0.1mm |
Surface quality (scratch & dig) | 60-40, 40-20, or better |
Surface accuracy | λ/2, λ/4 or better |
Parallelism | 3' ,30'' |
Bevel | 0.1~0.3mm x 45 degree |
Clear aperture | >85%,>90% |
Coating | AR coating or cutom |
Material properties of MgF2
Optical Properties | |
Transmission Range | 0.12-9μm |
Transmittance | >90%@0.193-6μm |
Refractive Index | NO=1.566,Ne=1.568@0.13μm |
NO=1.334,Ne=1.343@5μm | |
Reflection Loss | 11.2%@0.12nm(both surfaces) |
5.7%@0.22μm(both surfaces) | |
5.1%@1μm(both surfaces) | |
Absorption Coefficienet | 40×10-3@2.7μm |
Structure | square crystal system |
Cleavage Planes | <100> |
Physical Properties | |
Density[g/cm3] | 3.177 |
Melting Point [℃] | 1255 |
ThermalConductivity [W/(m×K)] | 21 //c, 33.6⊥c @ 300K |
Thermal Expansion [10-6/K] | 13.7//c, 8.9 ⊥c @ 373k |
Knoop Hardness [kg/mm2] | 415 |
Specific Heat Capacity [J/(kg×K)] | 1003 |
Dielectric Constant | 4.87 //c, 5.44⊥c @ 1MHz |
Young's Modulus (E) [GPa] | 138.5 |
Shear Modulus(G) [GPa] | 54.66 |
Bulk modulus(K) [GPa] | 101.32 |
Poisson Coefficient | 0.276 |
Chemical Properties | |
Solubility / g/L | 0.002g @ 20℃ |
Molecular Weight / g/mol | 62.3018 |
Transmission curve
Magnesium fluoride (MgF2) is a birefringent crystal with excellent optical properties in the ultraviolet band, which is the known optical crystal in the ultraviolet cutoff band.Magnesium fluoride is popular in many UV and IR applications and is ideal for applications in the 200nm-6um.Compared to other materials, magnesium fluoride is particularly durable in the deep ultraviolet and far infrared.
