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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: 4.5 - 7.5 µmZinc Selenide Plano-Convex Lenses, AR Coated: 4.5 - 7.5 µm
- AR Coated for 4.5 - 7.5 µm
- Choose from Ø1/2" or Ø1" Sizes
- Suitable for MIR Laser Applications
- Excellent for IR Imaging, Biomedical, or Military Applications
LA7477-E2
Ø1/2" Lens
f = 15.0 mm
LA7753-E2
Ø1" Lens
f = 1000.0 mm
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| Specifications | |
|---|---|
| Substrate Material | Laser Grade Zinc Selenidea |
| AR Coating Range | 4.5 - 7.5 μm |
| Reflectance over AR Coating Range @ 0° AOI |
Ravg < 1.0%, Rabs < 2.0% |
| Transmission over AR Coating Range @ 0° AOI |
Tavg > 97%, Tabs > 94% |
| Diameter Tolerance | +0.00/-0.10 mm |
| Thickness Tolerance | ±0.1 mm |
| Focal Length Tolerance | ±1% |
| Surface Quality | 60-40 Scratch-Dig |
| Surface Flatness (Plano Side) |
λ/2 |
| Spherical Surface Powerc (Convex Side) |
3λ/2 |
| Surface Irregularity (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 4.5 - 7.5 μm Range
- Focal Lengths from 15.0 mm to 1000.0 mm Available
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
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.
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.
| Selection Guide |
|---|
| Zinc Selenide Lenses |
| Other MIR Lenses |
| Other Spherical Singlets |
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.
| Recommended Mounting Options for Thorlabs Lenses | ||
|---|---|---|
| Item # | Mounts for Ø2 mm to Ø10 mm Optics | |
| Imperial | Metric | |
| (Various) | 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 |
| 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) |
| CXY1 | 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 # | 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 |
| SCL60C | 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.
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| Item # | Diameter | Focal Length | Dioptera | Radius of Curvature | Center Thickness | Edge Thicknessb | Back Focal Lengthc | Reference Drawing |
|---|---|---|---|---|---|---|---|---|
| LA7477-E2 | 12.7 mm | 15.0 mm | +66.6 | 21.0 mm | 3.0 mm | 2.0 mm | 13.8 mm |  |
| LA7733-E2 | 12.7 mm | 20.0 mm | +50.0 | 28.1 mm | 2.7 mm | 2.0 mm | 18.9 mm | |
| LA7673-E2 | 12.7 mm | 40.0 mm | +25.0 | 56.1 mm | 2.4 mm | 2.0 mm | 39.0 mm |
| Item # | Diameter | Focal Length | Dioptera | Radius of Curvature | Center Thickness | Edge Thicknessb | Back Focal Lengthc | Reference Drawing |
|---|---|---|---|---|---|---|---|---|
| LA7542-E2 | 25.4 mm | 25.4 mm | +39.4 | 35.6 mm | 4.3 mm | 2.0 mm | 23.6 mm | |
| LA7656-E2 | 25.4 mm | 50.1 mm | +20.0 | 70.2 mm | 4.0 mm | 2.8 mm | 48.4 mm | |
| LA7660-E2 | 25.4 mm | 75.0 mm | +13.3 | 105.2 mm | 4.0 mm | 3.2 mm | 73.0 mm | |
| LA7261-E2 | 25.4 mm | 100.2 mm | +10.0 | 140.5 mm | 4.0 mm | 3.4 mm | 98.5 mm | |
| LA7028-E2 | 25.4 mm | 149.0 mm | +6.7 | 209.0 mm | 4.0 mm | 3.6 mm | 147.3 mm | |
| LA7228-E2 | 25.4 mm | 200.0 mm | +5.0 | 280.5 mm | 4.0 mm | 3.7 mm | 199.3 mm | |
| LA7270-E2 | 25.4 mm | 500.0 mm | +2.0 | 701.3 mm | 2.1 mm | 2.0 mm | 499.1 mm | |
| LA7234-E2 | 25.4 mm | 750.0 mm | +1.3 | 1052.0 mm | 2.1 mm | 2.0 mm | 749.1 mm | |
| LA7753-E2 | 25.4 mm | 1000.0 mm | +1.0 | 1402.7 mm | 2.1 mm | 2.0 mm | 999.1 mm |
 ZnSe, -E2 Coated |
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