Germanium Plano-concave Lens

A germanium plano-concave lens is composed of a plane and a concave spherical surface, which can generate negative spherical aberration. It is often used in systems to expand the beam of light or increase the focal length to balance the deviation of other lenses. Its transmission spectrum range is 2-12 μ m, and it is an infrared optical material with good thermal conductivity and insoluble in water. Widely used in infrared imaging systems and infrared spectrometer systems. 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 germanium Plano concave 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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The product undergoes multiple inspections before being stored, and the quality is guaranteed. Please use it with confidence.

Spot products, shipped within 48 hours. For non stock or customized products, please consult.

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Optical products are special items and cannot be returned or exchanged unless there is a quality issue with the product itself

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)	Design Wavelength(μm)	Radius of Curvature(mm)	Surface Quality
	Screen Reset 2-300	Screen Reset 15-5000	Screen Reset 0.12-60	Screen Reset Customizable	Screen Reset Customizable	Screen Reset Customizable	Screen Reset 60-40
More+ Less	2-300	15-5000	0.12-60	Customizable	Customizable	Customizable	60-40
Germanium Plano Concave Lenses Number：PGe04- Dia(mm)：2-300 Focal Length(mm)：15-5000 Center Thickness(mm)：0.12-60 Edge Thickness(mm)：Customizable Design Wavelength(μm)：Customizable Radius of Curvature(mm)：Customizable Surface Quality：60-40 Diameter Tolerance(mm)：+0.0/-0.1 Thk Tolerance(mm)：±0.1 Substrate Material：Germanium（Ge） PV@632.8nm：λ/4 Centering：<3′ Coating：Uncoated Clear Aperture：>90% REACH：Compliant ROHS：Compliant

Material Data
Optical Properties
Transmission Range	2-15μm
Reflection Loss	4.0028@10.6μm
Absorption Coefficienet	1.3×10-3@3.8μm 3×10-2@10.6μm
Structure	Cubic Crystal System
Cleavage Planes	<111>
Physical Properties
Density [g/cm3]	5.33
Melting Point [℃]	936
Thermal Conductivity [W/(m×K)]	58.61 @ 293K
Thermal Expansion [10-6/K]	6.1 @ 298K
Knoop Hardness [kg/mm2]	780
Specific Heat Capacity [J/(kg×K)]	310
Dielectric Constant	16.6 @9.37 GHz
Young's Modulus (E) [GPa]	102.7
Shear Modulus(G) [GPa]	67
Bulk Modulus(K) [GPa]	77.2
Poisson Coefficient	0.28
Chemical Properties
Solubility / g/L	Inoluble
Molecular Weight / g/mol	72.61