Click Link for Detailed Specifications on the Substrate
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
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.
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.
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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N-SF11 Plano-Convex Lenses, Uncoated
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
Suggested Fixed Lens Mounts: LMR05(/M) or MLH05(/M) with an LMRA2 (Ø2 mm) or LMRA3 (Ø3 mm) Glue-In Adapter for Small Optics
Reciprocal of the Focal Length in Meters
Edge Thickness Measured Between Bevels
N-SF11 Plano-Convex Lenses (AR Coating: 350 - 700 nm)
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
Suggested Fixed Lens Mounts: LMR05(/M) or MLH05(/M) with an LMRA2 (Ø2 mm) or LMRA3 (Ø3 mm) Glue-In Adapter for Small Optics
Reciprocal of the Focal Length in Meters
Edge Thickness Measured Between Bevels
Average Reflectance Over Coating Range at 0° AOI
N-SF11 Plano-Convex Lenses (AR Coating: 650 - 1050 nm)
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
Suggested Fixed Lens Mounts: LMR05(/M) or MLH05(/M) with an LMRA2 (Ø2 mm) or LMRA3 (Ø3 mm) Glue-In Adapter for Small Optics
Reciprocal of the Focal Length in Meters
Edge Thickness Measured Between Bevels
Average Reflectance Over Coating Range at 0° AOI
N-SF11 Plano-Convex Lenses (AR Coating: 1050 - 1700 nm)
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
Suggested Fixed Lens Mounts: LMR05(/M) or MLH05(/M) with an LMRA2 (Ø2 mm) or LMRA3 (Ø3 mm) Glue-In Adapter for Small Optics