Click the link for detailed specifications on the substrate.
Over AR Coating Range, 0° AOI
At 633 nm.
Much like surface flatness for flat optics, spherical surface power is a measure of the deviation between the surface of the curved optic and a calibrated reference gauge, typically for a 633 nm source, unless otherwise stated. This specification is also commonly referred to as surface fit.
Zemax Files
Click on the red Document icon next to the item numbers below to access the Zemax file download. Our entire Zemax Catalog is also available.
Features
ZnSe Substrate
Ø1/2" and Ø1" Versions Available
Broadband AR Coating for the 2 - 13 μm Range
Focal Lengths from 15 mm to 1000 mm Available
Transmissive for Red Alignment Lasers
Thorlabs' Ø1/2" and Ø1" Zinc Selenide (ZnSe) Plano-Convex Lenses are available with a broadband antireflection (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 in excess of 92% over the entire AR coating range. See the Graphs tab for detailed information.
ZnSe lenses are commonly used in IR imaging, biomedical, and military applications. The lenses below are also particularly well suited for use with high-power CO2 lasers. Additionally, they provide enough transmission in the visible region to allow the use of a red alignment beam.
Usage To minimize the introduction of spherical aberrations, light should be bent gradually as it propagates through the lens. Therefore, when using a plano-convex lens to focus a collimated light source, the collimated light should be incident on the curved surface. Similarly, when collimating a point source of light, the diverging light rays should be incident on the planar surface of the lens.
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.
Click to Enlarge 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.
Click to Enlarge Click for Raw Data This plot gives the measured reflectance (per surface) at an 8° angle of incidence (AOI) of our -E4 AR-coated zinc selenide substrates. The average reflectance is <3.5% per surface within the shaded wavelength range of 2.0 - 13.0 µm.
Click to Enlarge CXY1 Translation Mount and SM1 Lens Tube Mounted in a 30 mm Cage System
Self-Centering Mount for 60 mm Cage Systems, Ø0.15" (Ø3.8 mm) to Ø1.77" (Ø45.0 mm) Optics
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.
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Ø1/2" ZnSe Plano-Convex Lenses
Item #
Diameter
Focal Length
Dioptera
Radius of Curvature
Edge Thicknessb
Center Thickness
Back Focal Length
Reference Drawing
LC7477-E4
12.7 mm
15.0 mm
+66.7
21.0 mm
2.0 mm
3.0 mm
13.8 mm
LC7733-E4
12.7 mm
20.0 mm
+50.0
28.1 mm
2.0 mm
2.7 mm
18.9 mm
LC7673-E4
12.7 mm
40.0 mm
+25.0
56.1 mm
2.0 mm
2.4 mm
39.0 mm
Reciprocal of the Focal Length in Meters
Edge Thickness Value is Given Before the 0.2 mm Losses Due to Each 45° Typical Chamfer