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N-SF11 Plano-Concave Lenses, Uncoated


  • Use to Diverge Collimated Beams
  • Excellent Chemical Resistance

LC2265

(Ø1/2")

LC2873

(Ø9 mm)

LC2969

(Ø6 mm)

LC2679

(Ø1")

Related Items


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Common Specifications
Lens Shape Plano / Concave
Substrate Material N-SF11a
Wavelength Rangeb 420 nm - 2.3 μm (Uncoated)
Diameters Available 6 mm, 9 mm, 1/2", or 1"
Diameter Tolerance +0.00/-0.10 mm
Thickness Tolerance ±0.1 mm
Focal Length Tolerance ±1%
Design Wavelength 587.6 nm
Index of Refraction @ 633 nm 1.778
Abbe Number vd=25.76
Surface Quality 40-20 Scratch-Dig
Surface Flatness (Plano Side) λ/2
Spherical Surface Power
(Concave Side)c
3λ/2
Surface Irregularity (Peak to Valley) λ/4
Centration ≤3 arcmin
Clear Aperture >90% of Diameter
Focal Length Tolerance ±1%
  • Click Link for Detailed Specifications on the Substrate
  • These lenses are also available with an AR coating for the 350 - 700 nm range, the 650 - 1050 nm range, or the 1050 - 1700 nm range.
  • 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
  • Wavelength Range: 420 nm - 2.3 μm (Uncoated)
  • Choose from 4 Diameters: 6 mm, 9 mm, 1/2", or 1"
  • Offers Better Chemical Resistance than N-BK7

These Plano-Concave lenses, which are fabricated from N-SF11 glass, are uncoated. N-SF11 glass, a RoHS complient version of SF11, is most commonly used in harsh environments since it is inert to biological degradation and resistant to naturally encountered chemicals, alkalis, and acids. With an uncoated wavelength range of 420 nm - 2.3 μm, N-SF11 also offers a usage range that is slightly shifted to the red compared to N-BK7, which is our RoHS-compliant BK7 glass and has an uncoated wavelength range of 350 nm - 2.0 μm. Since N-SF11 glass has a lower Abbe Number than N-BK7 glass (25.76 compared to 64.17), it is associated with more dispersion.

Optic Cleaning Tutorial

Like all plano-concave lenses, these lenses have negative focal lengths and can be used to diverge collimated beams. In this case, the curved surface of the lens should face the source to minimize spherical aberration. In addition, they can be employed to offset the effects of spherical aberration caused by other lenses in an optical system.

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 measured transmission for a 10 mm thick uncoated sample of N-SF11 using normal incident light. Each lens can be purchased uncoated or with our -A (350 - 700 nm), -B (650 - 1050 nm), or -C (1050 - 1700 nm) antireflection coating.

Click Here for Raw Data
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.


Posted Comments:
jjurado  (posted 2011-08-05 12:01:00.0)
Response from Javier at Thorlabs to jinwang: The internal transmission of N-SF11 glass at 407 nm is ~85% (10 mm thick sample) and ~67% for a 25 mm thick sample. Considering a nominal reflectance of 0.3% per surface for our AR A coating, we can estimate a total transmission of ~84.4% for the LCC2265-A (0.6% T loss). In reality, transmission may in fact be slightly higher, since the thickness of this lens along the optical axis is 3 mm.
? jinwang  (posted 2011-08-04 23:32:09.0)
The graph of the internal transmission of the N-SF11 doesnt clearly show how well it internally transmits 407nm light, what is the total % loss in a LC2265-A lens?

Ø6 mm N-SF11 Plano-Concave Lenses

Item # Diameter Focal Length Dioptera Radius of Curvature Center Thickness Edge Thicknessb Back Focal Length Reference
Drawing
LC2969c 6.0 mm -6.0 mm -166.7 -4.7 mm 1.5 mm 2.6 mm -6.8 mm Plano-Concave Lens Drawing
LC2632c 6.0 mm -12.0 mm -83.3 -9.3 mm 2.0 mm 2.5 mm -13.1 mm

Suggested Fixed Lens Mounts: LMR6(/M)

  • Reciprocal of the Focal Length in Meters
  • Edge Thickness Given Before 0.2 mm at 45° Typical Chamfer
  • Specifications for Coated and Uncoated Lenses Are the Same
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LC2969 Support Documentation
LC2969N-SF11 Plano-Concave Lens, f = -6.0 mm, Ø6 mm, Uncoated
$26.18
Today
LC2632 Support Documentation
LC2632N-SF11 Plano-Concave Lens, f = -12.0 mm, Ø6 mm, Uncoated
$25.10
Today

Ø9 mm N-SF11 Plano-Concave Lenses

Item # Diameter Focal Length Dioptera Radius of Curvature Center Thickness Edge Thicknessb Back Focal Length Reference
Drawing
LC2067c 9.0 mm -9.0 mm -111.1 -7.0 mm 2.0 mm 3.6 mm -10.1 mm Plano-Concave Lens Drawing
LC2873c 9.0 mm -18.0 mm -55.2 -14.0 mm 2.5 mm 3.2 mm -19.4 mm

Suggested Fixed Lens Mounts: LMR9(/M)

  • Reciprocal of the Focal Length in Meters
  • Edge Thickness Given Before 0.2 mm at 45° Typical Chamfer
  • Specifications for Coated and Uncoated Lenses Are the Same
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LC2067 Support Documentation
LC2067N-SF11 Plano-Concave Lens, f = -9.0 mm, Ø9 mm, Uncoated
$30.84
Today
LC2873 Support Documentation
LC2873N-SF11 Plano-Concave Lens, f = -18.0 mm, Ø9 mm, Uncoated
$25.65
Today

Ø1/2" (12.7 mm) N-SF11 Plano-Concave Lenses

Item # Diameter Focal Length Dioptera Radius of Curvature Center Thickness Edge Thicknessb Back Focal Length Reference
Drawing
LC2265c 1/2" -15.0 mm -66.6 -11.7 mm 3.0 mm 4.9 mm -16.7 mm Plano-Concave Lens Drawing

Suggested Fixed Lens Mount: LMR05(/M)

  • Reciprocal of the Focal Length in Meters
  • Edge Thickness Given Before 0.2 mm at 45° Typical Chamfer
  • Specifications for Coated and Uncoated Lenses Are the Same
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LC2265 Support Documentation
LC2265N-SF11 Plano-Concave Lens, f = -15.0 mm, Ø1/2", Uncoated
$31.92
Today

Ø1" (25.4 mm) N-SF11 Plano-Concave Lenses

Item # Diameter Focal Length Dioptera Radius of Curvature Center Thickness Edge Thicknessb Back Focal Length Reference
Drawing
LC2679c 1" -30.0 mm -33.3 -23.4 mm 3.5 mm 7.3 mm -32.0 mm Plano-Concave Lens Drawing

Suggested Fixed Lens Mounts: LMR1(/M) & SM1L05

  • Reciprocal of the Focal Length in Meters
  • Edge Thickness Given Before 0.2 mm at 45° Typical Chamfer
  • Specifications for Coated and Uncoated Lenses Are the Same
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LC2679 Support Documentation
LC2679N-SF11 Plano-Concave Lens, f = -30.0 mm, Ø1", Uncoated
$31.12
Today
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