Calcium Fluoride Biconcave Lens

Calcium fluoride biconcave lenses are used to increase the divergence of converging light. The focal length of this type of lens is negative, which can cause parallel incident light to diverge outward. The two sides have equal curvature radii, which are used for beam expansion and projection. UM OPTICS can provide a diameter of 2-300mm and a thickness of 0.12-60mm (accuracy can reach 20-10,1)/ 10L@633nm ）The calcium 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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If you need customization or bulk production, please contact us online and we will offer you a discounted price.

	Dia(mm)	Focal Length(mm)	Center Thickness(mm)	Edge Thickness(mm)	Radius of Curvature(mm)
	Screen Reset 25.4 12.7	Screen Reset F-50 F-30 F-25 F-15	Screen Reset 3 2.5	Screen Reset 6.8 9 4.9 5.7	Screen Reset -43.8 -26.4 -22.1 -13.4
More+ Less	25.4	F-50	3	6.8	-43.8
Φ25.4mm，F-50，Calcium Fluoride Biconcave Lenses Number：PCa06E002 Dia(mm)：25.4 Focal Length(mm)：F-50 Center Thickness(mm)：3 Edge Thickness(mm)：6.8 Design Wavelength(μm)：0.588 Radius of Curvature(mm)：-43.8 Surface Quality：40-20 Diameter Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Substrate Material：Calcium Fluoride（CaF2） Power@632.8nm：3λ/2 PV@632.8nm：λ/4 Centering：<3′ Clear Aperture：>90% Coating：Uncoated REACH：Compliant ROHS：Compliant
More+ Less	25.4	F-30	2.5	9	-26.4
Φ25.4mm，F-30，Calcium Fluoride Biconcave Lenses Number：PCa06E001 Dia(mm)：25.4 Focal Length(mm)：F-30 Center Thickness(mm)：2.5 Edge Thickness(mm)：9 Design Wavelength(μm)：0.588 Radius of Curvature(mm)：-26.4 Surface Quality：40-20 Diameter Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Substrate Material：Calcium Fluoride（CaF2） Power@632.8nm：3λ/2 PV@632.8nm：λ/4 Centering：<3′ Clear Aperture：>90% Coating：Uncoated REACH：Compliant ROHS：Compliant
More+ Less	12.7	F-25	3	4.9	-22.1
Φ12.7mm，F-25，Calcium Fluoride Biconcave Lenses Number：PCa06C002 Dia(mm)：12.7 Focal Length(mm)：F-25 Center Thickness(mm)：3 Edge Thickness(mm)：4.9 Design Wavelength(μm)：0.588 Radius of Curvature(mm)：-22.1 Surface Quality：40-20 Diameter Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Substrate Material：Calcium Fluoride（CaF2） Power@632.8nm：3λ/2 PV@632.8nm：λ/4 Centering：<3′ Clear Aperture：>90% Coating：Uncoated REACH：Compliant ROHS：Compliant
More+ Less	12.7	F-15	2.5	5.7	-13.4
Φ12.7mm，F-15，Calcium Fluoride Biconcave Lenses Number：PCa06C001 Dia(mm)：12.7 Focal Length(mm)：F-15 Center Thickness(mm)：2.5 Edge Thickness(mm)：5.7 Design Wavelength(μm)：0.588 Radius of Curvature(mm)：-13.4 Surface Quality：40-20 Diameter Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Substrate Material：Calcium Fluoride（CaF2） Power@632.8nm：3λ/2 PV@632.8nm：λ/4 Centering：<3′ Clear Aperture：>90% Coating：Uncoated REACH：Compliant ROHS：Compliant

Material Data
Optical Properties
Transmission Range	0.13-10μm
Transmittance	>94%@193nm-7.87μm
Refractive Index	1.4288@2.5μm 1.39908@5μm
Reflection Loss	5.4%@5μm(both surfaces)
Absorption Coefficienet	7.8×10-4@2.7μm
Structure	Cubic Crystal System
Cleavage Planes	<111>
Physical Properties
Density [g/cm3]	3.18
Melting Point [℃]	1420
Thermal Conductivity [W/(m×K)]	9.71 @ 293K
Thermal Expansion [10-6/K]	18.5 @ 273K
Knoop Hardness [kg/mm2]	158.3
Specific Heat Capacity [J/(kg×K)]	854
Dielectric Constant	6.76 @ 1 MHz
Young's Modulus (E) [GPa]	75.8
Shear Modulus(G) [GPa]	33.77
Bulk Modulus(K) [GPa]	82.71
Poisson Coefficient	0.26
Chemical Properties
Solubility / g/L	0.016g @ 20℃
Molecular Weight / g/mol	78.0748

Calcium Fluoride Biconcave Lens

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