Products Home / Optical Elements / Optical Lenses / Spherical Singlet Lenses / Plano-Convex Spherical Lenses / ZnSe Plano-Convex Spherical Lenses / Zinc Selenide Plano-Convex Lenses, AR Coated: 2 - 13 µmZinc Selenide Plano-Convex Lenses, AR Coated: 2 - 13 µm
- AR Coating Optimized for the 2 - 13 µm Range
- Choose from Ø1/2'' or Ø1'' Sizes
- Suitable for CO2 Laser and IR Imaging Applications
LA7477-E4
Ø1/2'' Lens
f = 15 mm
LA7542-E4
Ø1'' Lens
f = 25.4 mm
LA7753-E4
Ø1'' Lens
f = 1000 mm
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| Specifications | |
|---|---|
| Substrate Material | Zinc Selenidea |
| AR Coating Range | 2.0 - 13.0 μm |
| Reflectanceb (Per Surface) | Ravg < 3.5% Rabs < 6% |
| Transmissionb | Tavg > 92% Tabs > 85% |
| Diameter Tolerance | +0.0/-0.1 mm |
| Thickness Tolerance | ±0.1 mm |
| Focal Length Tolerance | ±1% |
| Surface Quality | 60-40 Scratch-Dig |
| Surface Flatnessc (Plano Side) | λ/2 |
| Spherical Surface Powerc,d (Convex Side) | 3λ/2 |
| Surface Irregularityc (Peak to Valley) | λ/2 |
| Centration | <3 arcmin |
| Clear Aperture | Ø1/2" Lenses: >Ø10.2 mm Ø1" Lenses: >Ø20.3 mm |
| Design Wavelength | 10.6 μm |
 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.
| Selection Guide |
|---|
| Zinc Selenide Lenses |
| Other MIR Lenses |
| Other Spherical Singlets |
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.
| Recommended Mounting Options for Thorlabs Lenses | ||
|---|---|---|
| Item # | Mounts for Ø2 mm to Ø10 mm Optics | |
| Imperial | Metric | |
| (Various) | Fixed Lens Mounts and Mini-Series Fixed Lens Mounts for Small Optics, Ø5 mm to Ø10 mm | |
| (Various) | Small Optic Adapters for Use with Standard Fixed Lens Mounts, Ø2 mm to Ø10 mm | |
| Item # | Mounts for Ø1/2" (Ø12.7 mm) Optics | |
| Imperial | Metric | |
| LMR05 | LMR05/M | Fixed Lens Mount for Ø1/2" Optics |
| MLH05 | MLH05/M | Mini-Series Fixed Lens Mount for Ø1/2" Optics |
| LM05XY | LM05XY/M | Translating Lens Mount for Ø1/2" Optics |
| SCP05 | 16 mm Cage System, XY Translation Mount for Ø1/2" Optics | |
| (Various) | Ø1/2" Lens Tubes, Optional SM05RRC Retaining Ring for High-Curvature Lenses (See Below) |
|
| Item # | Mounts for Ø1" (Ø25.4 mm) Optics | |
| Imperial | Metric | |
| LMR1 | LMR1/M | Fixed Lens Mount for Ø1" Optics |
| LM1XY | LM1XY/M | Translating Lens Mount for Ø1" Optics |
| ST1XY-S | ST1XY-S/M | Translating Lens Mount with Micrometer Drives (Other Drives Available) |
| CXY1A | 30 mm Cage System, XY Translation Mount for Ø1" Optics | |
| (Various) | Ø1" Lens Tubes, Optional SM1RRC Retaining Ring for High-Curvature Lenses (See Below) |
|
| Item # | Mount for Ø1.5" Optics | |
| Imperial | Metric | |
| LMR1.5 | LMR1.5/M | Fixed Lens Mount for Ø1.5" Optics |
| (Various) | Ø1.5" Lens Tubes, Optional SM1.5RR Retaining Ring for Ø1.5" Lens Tubes and Mounts |
|
| Item # | Mounts for Ø2" (Ø50.8 mm) Optics | |
| Imperial | Metric | |
| LMR2 | LMR2/M | Fixed Lens Mount for Ø2" Optics |
| LM2XY | LM2XY/M | Translating Lens Mount for Ø2" Optics |
| CXY2 | 60 mm Cage System, XY Translation Mount for Ø2" Optics |
|
| (Various) | Ø2" Lens Tubes, Optional SM2RRC Retaining Ring for High-Curvature Lenses (See Below) |
|
| Item # | Adjustable Optic Mounts | |
| Imperial | Metric | |
| LH1 | LH1/M | Adjustable Mount for Ø0.28" (Ø7.1 mm) to Ø1.80" (Ø45.7 mm) Optics |
| LH2 | LH2/M | Adjustable Mount for Ø0.77" (Ø19.6 mm) to Ø2.28" (Ø57.9 mm) Optics |
| VG100 | VG100/M | Adjustable Clamp for Ø0.5" (Ø13 mm) to Ø3.5" (Ø89 mm) Optics |
| SCL03 | SCL03/M | Self-Centering Mount for Ø0.15" (Ø3.8 mm) to Ø1.77" (Ø45.0 mm) Optics |
| SCL04 | SCL04/M | Self-Centering Mount for Ø0.15" (Ø3.8 mm) to Ø3.00" (Ø76.2 mm) Optics |
| LH160C | LH160C/M | Adjustable Mount for 60 mm Cage Systems, Ø0.50" (Ø13 mm) to Ø2.00" (Ø50.8 mm) Optics |
| SCL60CA | SCL60C/M | 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.
| Posted Comments: | |
Iain Robinson
(posted 2023-07-06 14:43:14.12) I have a zinc selenide plano-convex lens (LA7477-E4) with an anti-reflection coating on both sides. A caret (arrow) has been drawn in pencil on the edge of the lens. What does the caret indicate? cdolbashian
(posted 2023-07-13 02:09:15.0) Thank you for reaching out to us with this inquiry. To our knowledge, the mark is not indicating anything specific. I have contacted you directly to discuss this. |
| Item # | Diameter | Focal Length | Dioptera | Radius of Curvature | Edge Thicknessb | Center Thickness | Back Focal Length | Reference Drawing |
|---|---|---|---|---|---|---|---|---|
| LA7477-E4 | 12.7 mm | 15.0 mm | +66.7 | 21.0 mm | 2.0 mm | 3.0 mm | 13.8 mm |  |
| LA7733-E4 | 12.7 mm | 20.0 mm | +50.0 | 28.1 mm | 2.0 mm | 2.7 mm | 18.9 mm | |
| LA7673-E4 | 12.7 mm | 40.0 mm | +25.0 | 56.1 mm | 2.0 mm | 2.4 mm | 39.0 mm |
| Item # | Diameter | Focal Length | Dioptera | Radius of Curvature | Edge Thicknessb | Center Thickness | Back Focal Length | Reference Drawing |
|---|---|---|---|---|---|---|---|---|
| LA7542-E4 | 25.4 mm | 25.4 mm | +39.4 | 35.6 mm | 2.0 mm | 4.3 mm | 23.6 mm | |
| LA7656-E4 | 25.4 mm | 50.1 mm | +20.0 | 70.2 mm | 2.8 mm | 4.0 mm | 48.4 mm | |
| LA7660-E4 | 25.4 mm | 75.0 mm | +13.3 | 105.2 mm | 3.2 mm | 4.0 mm | 73.0 mm | |
| LA7261-E4 | 25.4 mm | 100.2 mm | +10.0 | 140.5 mm | 3.4 mm | 4.0 mm | 98.5 mm | |
| LA7028-E4 | 25.4 mm | 149.0 mm | +6.7 | 209.0 mm | 3.6 mm | 4.0 mm | 147.3 mm | |
| LA7228-E4 | 25.4 mm | 200.0 mm | +5.0 | 280.5 mm | 3.7 mm | 4.0 mm | 199.3 mm | |
| LA7270-E4 | 25.4 mm | 500.0 mm | +2.0 | 701.3 mm | 2.0 mm | 2.1 mm | 499.1 mm | |
| LA7234-E4 | 25.4 mm | 750.0 mm | +1.3 | 1052.0 mm | 2.0 mm | 2.1 mm | 749.1 mm | |
| LA7753-E4 | 25.4 mm | 1000.0 mm | +1 | 1402.7 mm | 2.0 mm | 2.1 mm | 999.1 mm |
 ZnSe, -E4 Coated |