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Mounted N-BK7 Plano-Concave Lenses, Uncoated


LC1054-ML

(Ø1/2")

LC1715-ML

(Ø1")

  • Negative Focal Length Used to Diverge Collimated Beams
  • Zemax Files Available
  • Wavelength Range: 350 nm - 2.0 µm
  • Ø1/2", Ø1", or Ø2" Optics in SM-Threaded Mounts

LC1315-ML

(Ø2")

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Common Specifications
Lens Shape Plano-Concave
Substrate Material N-BK7 (Grade A)a
Wavelength Range 350 nm - 2.0 µm
Diameters Available Ø1/2" in SM05-Threaded Mount
(0.535"-40)
Ø1" in SM1-Threaded Mount
(1.035"-40)
Ø2" in SM1-Threaded Mount
(2.035"-40)
Diameter Tolerance +0.0/-0.1 mm
Thickness Tolerance ±0.1 mm
Focal Length Tolerance ±1%
Design Wavelength 633 nm
Index of Refraction
@ 633 nm
1.515
Surface Quality 40-20 Scratch-Dig
Surface Flatness
(Plano Side)
λ/2
Spherical Surface Powerb
(Concave Side)
3λ/2
Surface Irregularity
(Peak to Valley)
λ/4
Abbe Number vd = 64.17
Centration <3 arcmin
Clear Aperture Ø1/2" Lenses: >Ø11.0 mm
Ø1" Lenses: >Ø22.86 mm
Ø2" Lenses: >Ø45.72 mm
  • 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-BK7
  • Wavelength Range: 350 nm - 2.0 μm (Uncoated)
  • Choose from Ø1/2", Ø1", or Ø2" Optics
  • Mounted in SM-Compatible Lens Cells
  • Offers Excellent Transmission Throughout the Visible and Near Infrared

These Plano-Concave Lenses are fabricated from RoHS-compliant N-BK7 glass. N-BK7 is one of the most common types of optical glass used for high quality optical components. It is typically chosen whenever the additional benefits of UV fused silica (i.e., good transmission further into the UV and a lower coefficient of thermal expansion) are not necessary. However, for particularly harsh environments where the optic will be exposed to alkalis and acids, consider our N-SF11 plano-concave lenses. Since the Abbe Number of N-SF11 (25.76) is lower than that for N-BK7 (64.17), lenses fabricated from N-SF11 will exhibit higher dispersion than those fabricated from N-BK7.

Optic Cleaning Tutorial

These Ø1/2", Ø1", and Ø2" lenses are mounted in SM05- (0.535"-40), SM1- (1.035"-40), and SM2- (2.035"-40) compatible mounts, respectively, for compatibility with our line of SM-threaded lens tubes. These lenses, like all plano-concave 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.

N-BK7 lens kits are also available. Please click here for information.

N-BK7 Plano-Concave Lens Selection Guide
Unmounted Lenses Mounted Lenses
Uncoated Uncoated
A Coating (350 - 700 nm) A Coating (350 - 700 nm)
B Coating (650 - 1050 nm) B Coating (650 - 1050 nm)
C Coating (1050 - 1700 nm) C Coating (1050 - 1700 nm)

Custom Coatings are also available. Please contact our technical support staff for a quote.

Optical Coatings Guide
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-BK7, a RoHS-compliant form of BK7. Total Transmission is shown for a 10 mm thick, uncoated sample and includes surface reflections.

N-BK7 Transmittance
Click to Enlarge
Click Here for Raw Data


The lenses sold on this page are also available with broadband antireflective coatings, the reflectance traces of which are shown in the graph below.

These high-performance multilayer AR coatings have an average reflectance of less than 0.5% (per surface) across the specified wavelength ranges and provide good performance for angles of incidence (AOI) between 0° and 30° (0.5 NA). The plot shown below indicates the performance of the standard coatings in this family as a function of wavelength. Broadband coatings have a typical absorption of 0.25%, which is not shown in the reflectance plots.

Thorlabs' Standard Broadband Antireflection Coatings


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Ø1/2" Mounted N-BK7 Plano-Concave Lenses (Uncoated)

Item #Optic
Diameter
Focal LengthaDiopterbRadius of CurvatureCenter ThicknessEdge ThicknesscBack Focal Lengtha,dWorking DistanceaHousingReference
Drawing
LC1054-ML 1/2" -25.0 mm -40.0 -12.9 mm 3.0 mm 4.7 mm -26.9 mm -16.7 mm SM05-Threaded
Mount
Plano-Concave Lens Drawing
LC1060-ML 1/2" -30.0 mm -33.3 -15.4 mm 3.0 mm 4.4 mm -31.9 mm -21.7 mm
LC1439-ML 1/2" -50.0 mm -20.0 -25.7 mm 3.5 mm 4.3 mm -53.4 mm -43.2 mm
  • The focal length tolerance is ±1%. The back focal length and working distance values here are referenced to the design focal length.
  • Reciprocal of the Focal Length in Meters
  • Edge Thickness Given Before 0.2 mm at 45° Typical Chamfer
  • Specified for Unmounted Lens
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LC1054-ML Support Documentation
LC1054-MLCustomer Inspired! Ø1/2" N-BK7 Plano-Concave Lens, SM05-Threaded Mount, f = -25.0 mm, Uncoated
$33.55
Today
LC1060-ML Support Documentation
LC1060-MLCustomer Inspired! Ø1/2" N-BK7 Plano-Concave Lens, SM05-Threaded Mount, f = -30.0 mm, Uncoated
$34.36
Today
LC1439-ML Support Documentation
LC1439-MLCustomer Inspired! Ø1/2" N-BK7 Plano-Concave Lens, SM05-Threaded Mount, f = -50.0 mm, Uncoated
$34.36
Today

Ø1" Mounted N-BK7 Plano-Concave Lenses (Uncoated)

Item #Optic
Diameter
Focal LengthaDiopterbRadius of CurvatureCenter ThicknessEdge ThicknesscBack Focal Lengtha,dWorking DistanceaHousingReference
Drawing
LC1715-ML 1" -50.0 mm -20.0 -25.7 mm 3.5 mm 6.9 mm -52.3 mm -39.6 mm SM1-Threaded
Mount
Plano-Concave Lens Drawing
LC1582-ML 1" -74.9 mm -13.3 -38.6 mm 3.5 mm 5.6 mm -79.0 mm -66.3 mm
LC1120-ML 1" -99.9 mm -10.0 -51.5 mm 4.0 mm 5.6 mm -104.3 mm -91.6 mm
  • The focal length tolerance is ±1%. The back focal length and working distance values here are referenced to the design focal length.
  • Reciprocal of the Focal Length in Meters
  • Edge Thickness Given Before 0.2 mm at 45° Typical Chamfer
  • Specified for Unmounted Lens
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LC1715-ML Support Documentation
LC1715-MLCustomer Inspired! Ø1" N-BK7 Plano-Concave Lens, SM1-Threaded Mount, f = -50.0 mm, Uncoated
$35.44
Today
LC1582-ML Support Documentation
LC1582-MLCustomer Inspired! Ø1" N-BK7 Plano-Concave Lens, SM1-Threaded Mount, f = -75 mm, Uncoated
$35.44
Today
LC1120-ML Support Documentation
LC1120-MLCustomer Inspired! Ø1" N-BK7 Plano-Concave Lens, SM1-Threaded Mount, f = -100 mm, Uncoated
$35.16
Today

Ø2" Mounted N-BK7 Plano-Concave Lenses (Uncoated)

Item #Optic
Diameter
Focal LengthaDiopterbRadius of CurvatureCenter ThicknessEdge ThicknesscBack Focal Lengtha,dWorking DistanceaHousingReference
Drawing
LC1315-ML 2" -74.9 mm -13.3 -38.6 mm 3.5 mm 13.0 mm -73.1 mm -60.4 mm SM2-Threaded
Mount
Plano-Concave Lens Drawing
LC1093-ML 2" -99.9 mm -10.0 -51.5 mm 4.0 mm 10.7 mm -98.4 mm -85.7 mm
LC1611-ML 2" -149.9 mm -6.7 -77.2 mm 4.0 mm 8.3 mm -148.4 mm -135.7 mm
  • The focal length tolerance is ±1%. The back focal length and working distance values here are referenced to the design focal length.
  • Reciprocal of the Focal Length in Meters
  • Edge Thickness Given Before 0.2 mm at 45° Typical Chamfer
  • Specified for Unmounted Lens
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LC1315-ML Support Documentation
LC1315-MLCustomer Inspired! Ø2" N-BK7 Plano-Concave Lens, SM2-Threaded Mount, f = -75 mm, Uncoated
$66.01
Today
LC1093-ML Support Documentation
LC1093-MLCustomer Inspired! Ø2" N-BK7 Plano-Concave Lens, SM2-Threaded Mount, f = -100 mm, Uncoated
$60.06
Today
LC1611-ML Support Documentation
LC1611-MLCustomer Inspired! Ø2" N-BK7 Plano-Concave Lens, SM2-Threaded Mount, f = -150 mm, Uncoated
$58.71
Today
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