Magnesium Fluoride Biconcave Lens

Magnesium fluoride biconcave lenses have a biconvex shape, consisting of two inward facing, identical curved surfaces and a negative focal length. The surface of the magnesium fluoride biconcave lens, which is used for reducing images or diverging light, undergoes precise processing and polishing to ensure its optical performance. It has high transmittance, high refractive index, and stability, and is used in lasers, spectrometers, telescopes, etc. UM OPTICS can provide a diameter of 2-200mm and a thickness of 0.12-60mm (accuracy can reach 20-10, 1)/ 10L@633nm ）Magnesium fluoride biconcave lens. Can be coated with MgF2, UV-AR, UV-VIS, VIS-EXT, VIS-NIR, NIR I, NIR II, Telecom NIR, SWIR, SWIR, YAG-BBAR and other film systems.

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	Dia(mm)	Focal Length(mm)	Center Thickness(mm)	Edge Thickness(mm)	Design Wavelength(μm)	Radius of Curvature(mm)	Surface Quality
	Screen Reset 2-200	Screen Reset 15-5000	Screen Reset 0.12-60	Screen Reset 0.12-60	Screen Reset Custom	Screen Reset Custom	Screen Reset 60-40
More+ Less	2-200	15-5000	0.12-60	0.12-60	Custom	Custom	60-40
Magnesium Fluoride Biconcave Lenses Number：PMg06- Dia(mm)：2-200 Focal Length(mm)：15-5000 Center Thickness(mm)：0.12-60 Edge Thickness(mm)：0.12-60 Design Wavelength(μm)：Custom Radius of Curvature(mm)：Custom Surface Quality：60-40 Diameter Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Substrate Material：Magnesium Fluoride（MgF2） PV@632.8nm：λ/4 Centering：3 Clear Aperture：>90% Coating：Uncoated REACH：Compliant ROHS：Compliant

Material Data
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
Thermal Conductivity [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