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UV Fused Silica Bi-Convex Lenses, Uncoated


  • Positive Focal Length for Use at Finite Conjugates
  • Zemax Files Available

LB4553

(Ø2")

LB4330

(Ø1")

LB4915

(Ø1/2")

LB4537

(Ø6 mm)

LB4743

(Ø5 mm)

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Common Specifications*
Lens Shape Convex/Convex
Diameters Available Ø5 mm, Ø6 mm, Ø1/2", Ø1", or Ø2"
Diameter Tolerance +0.0 mm / -0.1 mm
Substrate Material UV Grade Fused Silica
Focal Length Tolerance ±1%
Surface Quality 40-20 Scratch-Dig
Spherical Surface Power 3λ/2
Spherical Surface Irregularity λ/4
Clear Aperture >90% of Dia.
Design Wavelength 588 nm
Index of Refraction
(@ Design λ)
1.460
Centration ≤3 arcmin

*These lenses are also available with AR coatings for wavelength ranges 245 - 400 nm (-UV), 350 - 700 nm (-A), 650 - 1050 nm (-B), and 1050 - 1700 nm (-C).

Bi-Convex Lens Selection Guide
N-BK7
Mounted N-BK7
UV Fused Silica
CaF2
ZnSe -F (8 - 12 µm)

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

Features

  • 5 Different Diameters Available: Ø5 mm, Ø6 mm, Ø1/2", Ø1", and Ø2"
  • Wavelength Range: 185 nm - 2.1 μm (Uncoated)
  • Focal Lengths Available from 10.0 - 1000.0 mm
  • Fabricated from UV Grade Fused Silica

Thorlabs' UV Grade Fused Silica Bi-Convex Lenses are available here uncoated. UV-grade fused silica offers high transmission in the deep UV and exhibits virtually no laser-induced fluorescence (as measured at 193 nm), making it an ideal choice for applications from the UV to the near IR. In addition, UV fused silica has better homogeneity and a lower coefficient of thermal expansion than N-BK7.

Bi-convex lenses are popular for many finite imaging applications. Both surfaces are spherical and have the same radius of curvature, minimizing aberrations in situations where the object and image distances are equal or nearly equal. As a guideline, bi-convex lenses are the best choice for minimizing aberrations if the conjugate ratio (object distance : image distance) is between 5:1 and 1:5. Outside this range, plano-convex lenses are usually preferred.

Thorlabs offers these bi-convex lenses in sizes ranging from Ø5 mm to Ø2". Each size is compatible with a multitude of Thorlabs lens mounts. Please see the Mounting Options tab for details.

Optic Cleaning Tutorial
Optical Coatings and Substrates
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 a 10 mm thick uncoated sample of UV fused silica when the incident ilght is normal to the surface. Please note that this is the measured transmission, including surface reflections.

UVFS Transmission
Click Here for Raw Data
Click to Enlarge
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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Ø5 mm UV Fused Silica Bi-Convex Lens, Uncoated

Item # Diameter Focal Length Dioptera Radius of Curvature Center Thickness Edge Thickness Back Focal Length Reference
Drawing
LB4743 5.0 mm 10.0 mm +100.0 8.8 mm 2.2 mm 1.5 mm 9.2 mm Bi-Convex Lens Drawing

Suggested Fixed Lens Mounts: LMR5(/M)

  • Reciprocal of the Focal Length in Meters
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LB4743 Support Documentation
LB4743f = 10.0 mm, Ø5 mm UV Fused Silica Bi-Convex Lens, Uncoated
$89.82
Today

Ø6 mm UV Fused Silica Bi-Convex Lenses, Uncoated

Item # Diameter Focal Length Dioptera Radius of Curvature Center Thickness Edge Thickness Back Focal Length Reference
Drawing
LB4280 6.0 mm 10.0 mm +100.0 8.8 mm 2.6 mm 1.5 mm 9.1 mm Bi-Convex Lens Drawing
LB4537 6.0 mm 15.0 mm +66.6 13.4 mm 2.2 mm 1.5 mm 14.2 mm
LB4738 6.0 mm 20.0 mm +50.0 18.1 mm 2.0 mm 1.5 mm 19.3 mm

Suggested Fixed Lens Mounts: LMR6(/M)

  • Reciprocal of the Focal Length in Meters
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LB4280 Support Documentation
LB4280f = 10.0 mm, Ø6 mm UV Fused Silica Bi-Convex Lens, Uncoated
$86.03
Today
LB4537 Support Documentation
LB4537f = 15.0 mm, Ø6 mm UV Fused Silica Bi-Convex Lens, Uncoated
$85.49
Today
LB4738 Support Documentation
LB4738f = 20.0 mm, Ø6 mm UV Fused Silica Bi-Convex Lens, Uncoated
$83.59
Today

Ø1/2" (12.7 mm) UV Fused Silica Bi-Convex Lenses, Uncoated

Item # Diameter Focal Length Dioptera Radius of Curvature Center Thickness Edge Thickness Back Focal Length Reference
Drawing
LB4854 1/2" 20.0 mm +50.0 17.7 mm 4.2 mm 1.8 mm 18.5 mm Bi-Convex Lens Drawing
LB4003 1/2" 30.0 mm +33.3 27.1 mm 3.3 mm 1.8 mm 28.8 mm
LB4700 1/2" 40.0 mm +25.0 36.3 mm 2.9 mm 1.8 mm 39.9 mm
LB4915 1/2" 50.0 mm +20.0 45.6 mm 2.7 mm 1.8 mm 49.1 mm

Suggested Fixed Lens Mount: LMR05(/M)

  • Reciprocal of the Focal Length in Meters
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LB4854 Support Documentation
LB4854f = 20.0 mm, Ø1/2" UV Fused Silica Bi-Convex Lens, Uncoated
$88.19
Today
LB4003 Support Documentation
LB4003f = 30.0 mm, Ø1/2" UV Fused Silica Bi-Convex Lens, Uncoated
$82.25
Today
LB4700 Support Documentation
LB4700f = 40.0 mm, Ø1/2" UV Fused Silica Bi-Convex Lens, Uncoated
$73.86
Today
LB4915 Support Documentation
LB4915f = 50.0 mm, Ø1/2" UV Fused Silica Bi-Convex Lens, Uncoated
$66.55
Today

Ø1" (25.4 mm) UV Fused Silica Bi-Convex Lenses, Uncoated

Item # Diameter Focal Length Dioptera Radius of Curvature Center Thickness Edge Thickness Back Focal Length Reference
Drawing
LB4879 1" 35.0 mm +28.6 31.0 mm 7.4 mm 2.0 mm 32.4 mm Bi-Convex Lens Drawing
LB4030 1" 40.0 mm +25.0 35.7 mm 6.7 mm 2.0 mm 37.6 mm
LB4096 1" 50.0 mm +20.0 45.1 mm 5.7 mm 2.0 mm 48.0 mm
LB4330 1" 75.0 mm +13.3 68.3 mm 4.4 mm 2.0 mm 73.5 mm
LB4941 1" 100.0 mm +10.0 91.4 mm 3.8 mm 2.0 mm 98.7 mm
LB4913 1" 125.0 mm +8.0 114.5 mm 3.4 mm 2.0 mm 123.8 mm
LB4265 1" 150.0 mm +6.7 137.5 mm 3.2 mm 2.0 mm 148.9 mm
LB4282 1" 200.0 mm +5.0 183.6 mm 2.9 mm 2.0 mm 199.0 mm
LB4837 1" 250.0 mm +4.0 229.6 mm 2.7 mm 2.0 mm 249.1 mm
LB4545 1" 300.0 mm +3.3 275.6 mm 2.6 mm 2.0 mm 299.1 m
LB4453 1" 500.0 mm +2.0 459.7 mm 2.4 mm 2.0 mm 499.2 mm
LB4223 1" 750.0 mm +1.3 689.8 mm 2.2 mm 2.0 mm 749.2 mm
LB4374 1" 1000.0 mm +1.0 919.8 mm 2.2 mm 2.0 mm 999.3 mm

Suggested Fixed Lens Mount: LMR1(/M)

  • Reciprocal of the Focal Length in Meters
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LB4879 Support Documentation
LB4879f = 35.0 mm, Ø1" UV Fused Silica Bi-Convex Lens, Uncoated
$138.51
Today
LB4030 Support Documentation
LB4030f = 40.0 mm, Ø1" UV Fused Silica Bi-Convex Lens, Uncoated
$107.94
Today
LB4096 Support Documentation
LB4096f = 50.0 mm, Ø1" UV Fused Silica Bi-Convex Lens, Uncoated
$102.54
Today
LB4330 Support Documentation
LB4330f = 75.0 mm, Ø1" UV Fused Silica Bi-Convex Lens, Uncoated
$93.34
Today
LB4941 Support Documentation
LB4941f = 100.0 mm, Ø1" UV Fused Silica Bi-Convex Lens, Uncoated
$91.18
Today
LB4913 Support Documentation
LB4913f = 125.0 mm, Ø1" UV Fused Silica Bi-Convex Lens, Uncoated
$88.47
Today
LB4265 Support Documentation
LB4265f = 150.0 mm, Ø1" UV Fused Silica Bi-Convex Lens, Uncoated
$86.03
Today
LB4282 Support Documentation
LB4282f = 200.0 mm, Ø1" UV Fused Silica Bi-Convex Lens, Uncoated
$83.59
Today
LB4837 Support Documentation
LB4837f = 250.0 mm, Ø1" UV Fused Silica Bi-Convex Lens, Uncoated
$82.25
Today
LB4545 Support Documentation
LB4545f = 300.0 mm, Ø1" UV Fused Silica Bi-Convex Lens, Uncoated
$81.70
Today
LB4453 Support Documentation
LB4453f = 500.0 mm, Ø1" UV Fused Silica Bi-Convex Lens, Uncoated
$80.90
Today
LB4223 Support Documentation
LB4223f = 750.0 mm, Ø1" UV Fused Silica Bi-Convex Lens, Uncoated
$80.35
Today
LB4374 Support Documentation
LB4374f = 1000.0 mm, Ø1" UV Fused Silica Bi-Convex Lens, Uncoated
$80.07
Today

Ø2" (50.8 mm) UV Fused Silica Bi-Convex Lenses, Uncoated

Item # Diameter Focal Length Dioptera Radius of Curvature Center Thickness Edge Thickness Back Focal Length Reference
Drawing
LB4592 2" 60.0 mm +16.7 52.6 mm 15.6 mm 2.5 mm 54.4 mm Bi-Convex Lens Drawing
LB4553 2" 75.0 mm +13.3 67.0 mm 12.5 mm 2.5 mm 70.6 mm
LB4821 2" 100.0 mm +10.0 90.4 mm 10.3 mm 3.0 mm 96.4 mm
LB4140 2" 150.0 mm +6.7 136.8 mm 7.8 mm 3.0 mm 147.3 mm
LB4842 2" 200.0 mm +5.0 183.0 mm 6.5 mm 3.0 mm 197.7 mm
LB4972 2" 250.0 mm +4.0 229.1 mm 5.8 mm 3.0 mm 248.0 mm
LB4710 2" 300.0 mm +3.3 275.2 mm 5.4 mm 3.0 mm 298.2 mm
LB4910 2" 500.0 mm +2.0 459.4 mm 4.4 mm 3.0 mm 498.5 mm
LB4293 2" 1000.0 mm +1.0 919.6 mm 3.7 mm 3.0 mm 998.7 mm

Suggested Fixed Lens Mount: LMR2(/M)

  • Reciprocal of the Focal Length in Meters
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LB4592 Support Documentation
LB4592f = 60.0 mm, Ø2" UV Fused Silica Bi-Convex Lens, Uncoated
$339.79
Today
LB4553 Support Documentation
LB4553f = 75.0 mm, Ø2" UV Fused Silica Bi-Convex Lens, Uncoated
$310.57
Today
LB4821 Support Documentation
LB4821f = 100.0 mm, Ø2" UV Fused Silica Bi-Convex Lens, Uncoated
$286.76
Today
LB4140 Support Documentation
LB4140f = 150.0 mm, Ø2" UV Fused Silica Bi-Convex Lens, Uncoated
$281.35
Today
LB4842 Support Documentation
LB4842f = 200.0 mm, Ø2" UV Fused Silica Bi-Convex Lens, Uncoated
$266.20
Today
LB4972 Support Documentation
LB4972f = 250.0 mm, Ø2" UV Fused Silica Bi-Convex Lens, Uncoated
$252.13
Today
LB4710 Support Documentation
LB4710f = 300.0 mm, Ø2" UV Fused Silica Bi-Convex Lens, Uncoated
$234.82
Today
LB4910 Support Documentation
LB4910f = 500.0 mm, Ø2" UV Fused Silica Bi-Convex Lens, Uncoated
$219.67
Today
LB4293 Support Documentation
LB4293f = 1000.0 mm, Ø2" UV Fused Silica Bi-Convex Lens, Uncoated
$207.77
Today
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