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Zinc Selenide Plano-Convex Lenses, AR Coated: 4.5 - 7.5 µm![]()
LA7477-E2 Ø1/2" Lens LA7753-E2 Ø1" Lens Related Items ![]() Please Wait
Features
Thorlabs' Ø1/2" and Ø1" Zinc Selenide (ZnSe) Plano-Convex Lenses are available with a broadband AR coating optimized for the 4.5 - 7.5 μm spectral range deposited on both surfaces. This coating greatly reduces the high surface reflectance of the substrate, yielding an average transmission in excess of 97% over the entire AR coating range. See the Graphs tab for detailed information. ZnSe lenses are typically used as collimators for laser applications, such as biomedical and military applications. These lenses are also particularly well suited for use with high-power CO or CO2 lasers. Additionally, they may provide enough transmission in the visible region to allow the use of a visible alignment beam, although back reflections may be more pronounced. Usage When handling optics, one should always wear gloves. This is especially true when working with zinc selenide, as it is a hazardous material. For your safety, please follow all proper precautions, including wearing gloves when handling these lenses and thoroughly washing your hands afterward. Click here to download a pdf of the MSDS for ZnSe. Thorlabs will accept all ZnSe lenses back for proper disposal. Please contact Tech Support to make arrangements for this service.
In the graphs below, the shaded regions denote the specified AR coating range. Performance outside of the specified range is not guaranteed and varies from lot to lot.
![]() Click to Enlarge Click Here for Raw Data This graph shows the measured transmission of a 2.1 mm thick AR-coated zinc selenide lens at normal incidence, for reference. The performance of the lenses below will vary dependent on the thickness of the relevant component. ![]() Click to Enlarge Click Here for Raw Data This graph shows the measured transmission of a 5 mm thick AR-coated zinc selenide window at normal incidence, for reference. The performance of the lenses below will vary dependent on the thickness of the relevant component.
Mounting High-Curvature OpticsThorlabs' retaining rings are used to secure unmounted optics within lens tubes or optic mounts. These rings are secured in position using a compatible spanner wrench. For flat or low-curvature optics, standard retaining rings manufactured from anodized aluminum are available from Ø5 mm to Ø4". For high-curvature optics, extra-thick retaining rings are available in Ø1/2", Ø1", and Ø2" sizes. Extra-thick retaining rings offer several features that aid in mounting high-curvature optics such as aspheric lenses, short-focal-length plano-convex lenses, and condenser lenses. As shown in the animation to the right, the guide flange of the spanner wrench will collide with the surface of high-curvature lenses when using a standard retaining ring, potentially scratching the optic. This contact also creates a gap between the spanner wrench and retaining ring, preventing the ring from tightening correctly. Extra-thick retaining rings provide the necessary clearance for the spanner wrench to secure the lens without coming into contact with the optic surface.
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