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Products Home / Optical Elements / Optical Lenses / Spherical Singlet Lenses / Plano-Convex Spherical Lenses / N-SF11 Plano-Convex LensesN-SF11 Plano-Convex Lenses
- Available Uncoated or with One of Three AR Coatings
- Focal Lengths of 4.0 mm, 6.0 mm, or 9.0 mm
- 2.0 mm or 3.0 mm Diameter
LA2024
f = 4.0 mm, Uncoated
LA2036-B
f = 6.0 mm, AR Coated:
650 - 1050 nm
LA2039-C
f = 9.0 mm, AR Coated:
1050 - 1700 nm
LA2036
f = 6.0 mm, Uncoated
LA2026-A
f = 6.0 mm, AR Coated:
350 - 700 nm
LA2026-C
f = 6.0 mm, AR Coated:
1050 - 1700 nm
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| Common Specifications | |
|---|---|
| Lens Shape | Plano / Convex |
| Substrate Material | N-SF11a |
| Diameter Tolerance | +0.00 / -0.02 mm |
| Thickness Tolerance | ±0.03 mm |
| Focal Length Tolerance | ±1% |
| Design Wavelength | 587.6 nm |
| Index of Refraction @ 587.6 nm | 1.785 |
| Abbe Number | vd = 25.76 |
| Surface Quality | 60-40 Scratch-Dig |
| Surface Flatness (Plano Side) | λ/2 |
| Spherical Surface Power (Convex Side)b |
2λ |
| Surface Irregularity (Peak to Valley) | λ/2 |
| Centration | ≤5 arcmin |
| Clear Aperture | >90% of Diameter |
 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
- Material: N-SF11
- Available Uncoated or With One of Three Broadband Antireflection Coatings:
- Uncoated: 420 nm - 2.3 μm
- A Coated: 350 - 700 nm
- B Coated: 650 - 1050 nm
- C Coated: 1050 - 1700 nm
- Offers Better Chemical Resistance than N-BK7
- Available Focal Lengths of 4 mm, 6 mm, and 9 mm
These Plano-Convex Lenses are fabricated from RoHS-compliant N-SF11 glass. N-SF11 is most commonly used in harsh environments since it is inert to biological degradation and resistant to naturally encountered chemicals, alkalis, and acids. They have a positive focal length and can be used for infinite and finite conjugate applications.
Plano-convex lenses can focus a collimated beam or collimate light from a point source. To minimize the introduction of spherical aberration, a collimated light source should be incident on the curved surface of the lens when being focused and a point light source should be incident on the planar surface when being collimated.
The focal length of each lens can be calculated using a simplified thick lens equation:
f = R/(n-1),
where n is the index of refraction and R is the radius of curvature of the lens surface. These lenses are fabricated from
N-SF11, which has an Abbe Number of 25.76; this value is an indicator of the dispersion.
These N-SF11 plano-convex lenses are available with one of three antireflection coatings (-A, -B, or -C), which reduce the amount of light reflected from each surface of the lens. Please see the Graphs tab for coating information.
Thorlabs offers small optic mounting adapters which accept 2 mm or 3 mm lens diameters. After the lens is secured in the adapter with epoxy, the adapter and lens may be mounted in an LMR05(/M) Fixed Lens Mount or an MLH05(/M) Mini-Series Fixed Lens Mount. Please see the Mounting Options tab for more information.
| Quick Links to Other Spherical Singlets | ||||||
|---|---|---|---|---|---|---|
| Plano-Convex | Bi-Convex | Best Form | Plano-Concave | Bi-Concave | Positive Meniscus | Negative Meniscus |
Below is the transmission curve for N-SF11, a RoHS-compliant dense-flint glass that is transparent from 420 nm to 2.3 µm. Total Transmission is shown for a 10 mm thick, uncoated sample and includes surface reflections. Each of these unmounted N-SF11 plano-convex lenses can be ordered uncoated or with one of the following broadband AR coatings: 350 - 700 nm (Designated with -A), 650 - 1050 nm (Designated as -B), or 1050 - 1700 nm (Designated as -C).
These high-performance multilayer AR coatings have an average reflectance of less than 0.5% (per surface) across the specified wavelength ranges. Broadband coatings have a typical absorption of 0.25%, which is not shown in the reflectivity plots.
Click to Enlarge
Click Here for Raw Data
The blue shaded region indicates the specified 350 - 700 nm wavelength range for optimum performance.
Click to Enlarge
Click Here for Raw Data
The blue shaded region indicates the specified 650 - 1050 nm wavelength range for optimum performance.
Click to Enlarge
Click Here for Raw Data
The blue shaded region indicates the specified 1050 - 1700 nm wavelength range for optimum performance.
| 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) |
| 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 # | 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 |
| 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 #a | Diameter | Focal Length | Diopterb | Radius of Curvature | Center Thickness | Edge Thicknessc | Back Focal Length | Uncoated Wavelength Range |
Reference Drawing |
|---|---|---|---|---|---|---|---|---|---|
| LA2024 | 2.0 mm | 4.0 mm | +250.0 | 3.1 mm | 1.0 mm | 0.8 mm | 3.44 mm | 420 nm - 2.3 μm |  |
| LA2026 | 2.0 mm | 6.0 mm | +166.6 | 4.7 mm | 1.0 mm | 0.8 mm | 5.44 mm | ||
| LA2036 | 3.0 mm | 6.0 mm | +166.6 | 4.7 mm | 1.5 mm | 1.2 mm | 5.16 mm | ||
| LA2039 | 3.0 mm | 9.0 mm | +111.1 | 7.1 mm | 1.5 mm | 1.2 mm | 8.16 mm |
| Item #a | Diameter | Focal Length | Diopterb | Radius of Curvature | Center Thickness | Edge Thicknessc | Back Focal Length | AR Coating Reflectanced |
Reference Drawing |
|---|---|---|---|---|---|---|---|---|---|
| LA2024-A | 2.0 mm | 4.0 mm | +250.0 | 3.1 mm | 1.0 mm | 0.8 mm | 3.44 mm | <0.5% | |
| LA2026-A | 2.0 mm | 6.0 mm | +166.6 | 4.7 mm | 1.0 mm | 0.8 mm | 5.44 mm | ||
| LA2036-A | 3.0 mm | 6.0 mm | +166.6 | 4.7 mm | 1.5 mm | 1.2 mm | 5.16 mm | ||
| LA2039-A | 3.0 mm | 9.0 mm | +111.1 | 7.1 mm | 1.5 mm | 1.2 mm | 8.16 mm |
| Item #a | Diameter | Focal Length | Diopterb | Radius of Curvature | Center Thickness | Edge Thicknessc | Back Focal Length | AR Coating Reflectanced |
Reference Drawing |
|---|---|---|---|---|---|---|---|---|---|
| LA2024-B | 2.0 mm | 4.0 mm | +250.0 | 3.1 mm | 1.0 mm | 0.8 mm | 3.44 mm | <0.5% | |
| LA2026-B | 2.0 mm | 6.0 mm | +166.6 | 4.7 mm | 1.0 mm | 0.8 mm | 5.44 mm | ||
| LA2036-B | 3.0 mm | 6.0 mm | +166.6 | 4.7 mm | 1.5 mm | 1.2 mm | 5.16 mm | ||
| LA2039-B | 3.0 mm | 9.0 mm | +111.1 | 7.1 mm | 1.5 mm | 1.2 mm | 8.16 mm |
| Item #a | Diameter | Focal Length | Diopterb | Radius of Curvature | Center Thickness | Edge Thicknessc | Back Focal Length | AR Coating Reflectanced |
Reference Drawing |
|---|---|---|---|---|---|---|---|---|---|
| LA2024-C | 2.0 mm | 4.0 mm | +250.0 | 3.1 mm | 1.0 mm | 0.8 mm | 3.44 mm | <0.5% | |
| LA2026-C | 2.0 mm | 6.0 mm | +166.6 | 4.7 mm | 1.0 mm | 0.8 mm | 5.44 mm | ||
| LA2036-C | 3.0 mm | 6.0 mm | +166.6 | 4.7 mm | 1.5 mm | 1.2 mm | 5.16 mm | ||
| LA2039-C | 3.0 mm | 9.0 mm | +111.1 | 7.1 mm | 1.5 mm | 1.2 mm | 8.16 mm |
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