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Zinc Selenide Plano-Concave Lenses, AR Coated: 2 - 13 µm
f = -200 mm
f = -25.4 mm
Thorlabs' Ø1" Zinc Selenide (ZnSe) Plano-Concave Lenses are available with a broadband AR coating optimized for the 2 µm to 13 μm spectral range deposited on both surfaces. This coating greatly reduces the high surface reflectance of the substrate, yielding an average transmission >92% across the AR coating range. See the Graphs tab for detailed information.
Like all plano-concave lenses, these lenses have negative focal lengths and can be used to diverge collimated beams; in this case, the curved surface should face the source in order to minimize spherical aberration. In addition, they can be employed to offset the effects of spherical aberration caused by other lenses in an optical system. ZnSe lenses are particularly well suited for use with high-power CO2 lasers.
This substrate scratches easily and should be handled with care. When handling optics, 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. For the MSDS for ZnSe in English, click here, and for the MSDS in Japanese, click here. Thorlabs will accept all ZnSe windows back for proper disposal. Please contact Tech Support to make arrangements for this service.
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Click for Raw Data
This graph shows the measured transmission of an AR-coated zinc selenide window (Item # WG71050-E4) at normal incidence. The shaded region denotes the AR coating range, over which Tavg > 92%. Performance outside of the specified range is not guaranteed and varies from lot to lot.
Mounting High-Curvature Optics
Thorlabs' 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.