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N-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
Wavelength Range 420 nm - 2.3 μm (Uncoated)
Reflectance over Coating
Range (Avg.) @ 0° AOI
<0.5%
Diameters Available 2.0 mm and 3.0 mm
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 v= 25.76
Surface Quality 60-40 Scratch-Dig
Surface Flatness (Plano Side) λ/2
Spherical Surface Power
(Convex Side)b
Surface Irregularity (Peak to Valley) λ/2
Centration ≤5 arcmin
Clear Aperture >90% of Diameter
  • 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.
Optic Cleaning Tutorial

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.

Optical Coatings and Substrates
Lens Tutorial
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.

N-SF11 Total Transmission Graph
Click to Enlarge

Click Here for Raw Data
A AR Coating
Click to Enlarge

Click Here for Raw Data
The blue shaded region indicates the specified 350 - 700 nm wavelength range for optimum performance.
B AR Coating
Click to Enlarge

Click Here for Raw Data
The blue shaded region indicates the specified 650 - 1050 nm wavelength range for optimum performance.
C AR Coating
Click to Enlarge

Click Here for Raw Data
The blue shaded region indicates the specified 1050 - 1700 nm wavelength range for optimum performance.

N-BK7 AR Coating Curves

CXY1 in 30 mm Cage System
Click to Enlarge

CXY1 Translation Mount and
SM1 Lens Tube Mounted in a
30 mm Cage System
Threaded Mounting Adapter
Click to Enlarge

Ø1" Optic Mounted in a
ST1XY-S XY Translator

Click to Enlarge

LMR1 Fixed Mount with Ø1" Lens

Click to Enlarge

LM2XY Translating Mount with Ø2" Lens
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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N-SF11 Plano-Convex Lenses, Uncoated

Item #a Diameter Focal Length Diopterb Radius of Curvature Center Thickness Edge Thicknessc Back Focal Length Reference
Drawing
LA2024 2.0 mm 4.0 mm +250.0 3.1 mm 1.0 mm 0.8 mm 3.44 mm Plano-Convex Lens Drawing
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
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LA2024 Support Documentation
LA2024NEW!N-SF11 Plano-Convex Lens, Ø2.0 mm, f = 4.0 mm, Uncoated
$60.00
Today
LA2026 Support Documentation
LA2026NEW!N-SF11 Plano-Convex Lens, Ø2.0 mm, f = 6.0 mm, Uncoated
$60.00
Today
LA2036 Support Documentation
LA2036NEW!N-SF11 Plano-Convex Lens, Ø3.0 mm, f = 6.0 mm, Uncoated
$45.00
Today
LA2039 Support Documentation
LA2039NEW!N-SF11 Plano-Convex Lens, Ø3.0 mm, f = 9.0 mm, Uncoated
$45.00
Today

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 Reference
Drawing
LA2024-A 2.0 mm 4.0 mm +250.0 3.1 mm 1.0 mm 0.8 mm 3.44 mm Plano-Convex Lens Drawing
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
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LA2024-A Support Documentation
LA2024-ANEW!N-SF11 Plano-Convex Lens, Ø2.0 mm, f = 4.0 mm, AR Coating: 350 - 700 nm
$66.00
Today
LA2026-A Support Documentation
LA2026-ANEW!N-SF11 Plano-Convex Lens, Ø2.0 mm, f = 6.0 mm, AR Coating: 350 - 700 nm
$66.00
Today
LA2036-A Support Documentation
LA2036-ANEW!N-SF11 Plano-Convex Lens, Ø3.0 mm, f = 6.0 mm, AR Coating: 350 - 700 nm
$50.00
Today
LA2039-A Support Documentation
LA2039-ANEW!N-SF11 Plano-Convex Lens, Ø3.0 mm, f = 9.0 mm, AR Coating: 350 - 700 nm
$50.00
Today

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 Reference
Drawing
LA2026-B 2.0 mm 6.0 mm +166.6 4.7 mm 1.0 mm 0.8 mm 5.44 mm Plano-Convex Lens Drawing
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
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LA2026-B Support Documentation
LA2026-BNEW!N-SF11 Plano-Convex Lens, Ø2.0 mm, f = 6.0 mm, AR Coating: 650 - 1050 nm
$76.00
Today
LA2036-B Support Documentation
LA2036-BNEW!N-SF11 Plano-Convex Lens, Ø3.0 mm, f = 6.0 mm, AR Coating: 650 - 1050 nm
$60.00
Today
LA2039-B Support Documentation
LA2039-BNEW!N-SF11 Plano-Convex Lens, Ø3.0 mm, f = 9.0 mm, AR Coating: 650 - 1050 nm
$60.00
Today

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 Reference
Drawing
LA2024-C 2.0 mm 4.0 mm +250.0 3.1 mm 1.0 mm 0.8 mm 3.44 mm Plano-Convex Lens Drawing
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
  • Reciprocal of the Focal Length in Meters
  • Edge Thickness Measured Between Bevels
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LA2024-C Support Documentation
LA2024-CNEW!N-SF11 Plano-Convex Lens, Ø2.0 mm, f = 4.0 mm, AR Coating: 1050 - 1700 nm
$83.00
Today
LA2026-C Support Documentation
LA2026-CNEW!N-SF11 Plano-Convex Lens, Ø2.0 mm, f = 6.0 mm, AR Coating: 1050 - 1700 nm
$83.00
Today
LA2036-C Support Documentation
LA2036-CNEW!N-SF11 Plano-Convex Lens, Ø3.0 mm, f = 6.0 mm, AR Coating: 1050 - 1700 nm
$67.00
Today
LA2039-C Support Documentation
LA2039-CNEW!N-SF11 Plano-Convex Lens, Ø3.0 mm, f = 9.0 mm, AR Coating: 1050 - 1700 nm
$67.00
Today
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