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UV Fused Silica Plano-Concave Lenses, Uncoated


  • UV Grade Fused Silica Substrate
  • Diverges Collimated Incident Light
  • Wavelength Range: 185 nm to 2.1 µm

LC4357

(Ø1/2")

LC4291

(Ø8 mm)

LC4573

(Ø6 mm)

LC4513

(Ø1")

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Common Specifications
Lens Shape Plano/Concave
Substrate Material UV Grade Fused Silica
Wavelength Rangea 185 nm - 2.1 μm
Diameters Available 5 mm, 6 mm, 1/2", or 1"
Diameter Tolerance +0.00 mm / -0.10 mm
Thickness Tolerance ±0.1 mm
Focal Length Tolerance ±1%
Design Wavelength 588 nm
Index of Refraction (@ Design λ) 1.460
Surface Quality 40-20 Scratch-Dig
Surface Flatness
(Plano Side)
λ/2
Spherical Surface Power
(Concave Side)
b
3λ/2
Surface Irregularity
(Peak to Valley)
λ/4
Clear Aperture >90% of Diameter
Centration ≤3 arcmin
  • These lenses are also available with a -UV coating for the 245 - 400 nm range, an -A coating for the 350 - 700 nm range, a -B coating for the 650 - 1050 nm range, or a -C coating for the 1050 - 1620 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.

Optic Cleaning Tutorial Optical Coatings and Substrates

Features

  • 4 Different Diameters Available: 6 mm, 8 mm, 1/2", or 1"
  • Wavelength Range: 185 nm - 2.1 μm (Uncoated)
  • Focal Lengths Available from -10.0 to -200.0 mm
  • Fabricated from UV Grade Fused Silica
  • Form Virtual Images

Thorlabs' UV Grade Fused Silica Plano-Concave lenses are 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.

Plano-concave lenses have negative focal lengths, making them useful for a wide range of applications. They are commonly used to diverge a collimated incident beam; in such cases the collimated light source should be incident on the curved surface to minimize spherical aberrations. Plano-concave lenses, which produce virtual images, are used as the entrance optic in Galilean-type beam expanders; this lens provides the desired divergence and then a doublet is used to recollimate the beam. In optical systems, it is common for researchers to choose their optics carefully so that the aberrations introduced by the positive- and negative-focal-length lenses approximately cancel. Still others use these lenses in pairs to increase the effective focal length of a converging lens.

When deciding between a plano-concave lens and a bi-concave lens, both of which cause collimated incident light to diverge, it is usually preferable to choose a plano-concave lens if the desired absolute magnification is either less than 0.2 or greater than 5. Between these two values, bi-concave lenses are generally preferred.

Thorlabs offers these plano-concave lenses in sizes ranging from Ø6 mm to Ø1". Each size is compatible with a multitude of Thorlabs lens mounts. Please see the Mounting Options tab for details.

Plano-Concave Lens Selection Guide
N-BK7
N-SF11
UV Fused Silica
CaF2
ZnSe -F (8 - 12 µm)

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

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.
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 light is normal to the surface. Please note that this is the measured transmission, including surface reflections.

N-BK7 Transmittance
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 and Mini-Series 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
MLH05 MLH05/M Mini-Series 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 # Mount for Ø1.5" Optics
Imperial Metric
LMR1.5 LMR1.5/M Fixed Lens Mount for Ø1.5" Optics
(Various) Ø1.5" Lens Tubes,
Optional SM1.5RR Retaining Ring for Ø1.5" Lens Tubes and Mounts
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:
Marshall Scott  (posted 2019-07-10 12:24:21.47)
It's interesting that you have UVFS f = -150 mm hidden away in the meniscus lenses, but no -150 in plano concave. It would be nice to be able to filter/find lenses by focal length and other parameters (glass type, diameter, etc). It would make my life easier if I didn't have to search all the different pages when I don't care about the shape factor.
nbayconich  (posted 2019-07-12 10:32:36.0)
Thank you for contacting Thorlabs and thank you for your feedback. We appreciate suggestions from our customers and are open to new ideas to make it easier for our customers to find our products. I will forward your suggestion to our webteam for future consideration.
Tyler  (posted 2008-04-09 15:17:54.0)
Response from Tyler at Thorlabs: The surface specifications for these lenses are Irregularity: 1/2 ring and Power: 3 ring. Thank you for your interest in our products.
user  (posted 2008-04-09 00:18:01.0)
what is the surface accuracy of these lenses?

Ø6 mm UV Fused Silica Plano-Concave Lenses, Uncoated

Item # Diameter Focal Length Dioptera Radius of Curvature Center Thickness Edge Thicknessb Back Focal Length Reference
Drawing
LC4573 6.0 mm -10.0 mm -100.0 -4.6 mm 2.0 mm 3.1 mm -11.4 mm Plano-Concave Lens Drawing

Suggested Fixed Lens Mounts: LMR6(/M)

  • Reciprocal of the Focal Length in Meters
  • Edge Thickness Given Before 0.2 mm at 45° Typical Chamfer
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LC4573 Support Documentation
LC4573f = -10.0 mm, Ø6 mm UV Fused Silica Plano-Concave Lens, Uncoated
$78.46
Today

Ø8 mm UV Fused Silica Plano-Concave Lenses, Uncoated

Item # Diameter Focal Length Dioptera Radius of Curvature Center Thickness Edge Thicknessb Back Focal Length Reference
Drawing
LC4291 8.0 mm -12.0 mm -83.3 -5.5 mm 2.0 mm 3.7 mm -13.4 mm Plano-Concave Lens Drawing

Suggested Fixed Lens Mounts: LMR8(/M)

  • Reciprocal of the Focal Length in Meters
  • Edge Thickness Given Before 0.2 mm at 45° Typical Chamfer
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LC4291 Support Documentation
LC4291f = -12.0 mm, Ø8 mm UV Fused Silica Plano-Concave Lens, Uncoated
$82.25
Today

Ø1/2" (12.7 mm) UV Fused Silica Plano-Concave Lenses, Uncoated

Item # Diameter Focal Length Dioptera Radius of Curvature Center Thickness Edge Thicknessb Back Focal Length Reference
Drawing
LC4924 1/2" -20.0 mm -50.0 -9.2 mm 2.0 mm 4.5 mm -21.4 mm Plano-Concave Lens Drawing
LC4210 1/2" -25.0 mm -40.0 -11.5 mm 3.0 mm 4.9 mm -27.1 mm
LC4796 1/2" -30.0 mm -33.3 -13.8 mm 3.0 mm 4.6 mm -32.1 mm
LC4357 1/2" -50.0 mm -20.0 -23.0 mm 3.5 mm 4.4 mm -52.4 mm
LC4413 1/2" -75.0 mm -13.3 -34.5 mm 3.5 mm 4.1 mm -77.4 mm
LC4232 1/2" -100.0 mm -10.0 -46.0 mm 3.5 mm 3.9 mm -102.4 mm
LC4918 1/2" -200.0 mm -5.0 -92.0 mm 4.0 mm 4.2 mm -202.7 mm

Suggested Fixed Lens Mount: LMR05(/M)

  • Reciprocal of the Focal Length in Meters
  • Edge Thickness Given Before 0.2 mm at 45° Typical Chamfer
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LC4924 Support Documentation
LC4924f = -20.0 mm, Ø1/2" UV Fused Silica Plano-Concave Lens, Uncoated
$87.11
Today
LC4210 Support Documentation
LC4210f = -25.0 mm, Ø1/2" UV Fused Silica Plano-Concave Lens, Uncoated
$79.27
Today
LC4796 Support Documentation
LC4796f = -30.0 mm, Ø1/2" UV Fused Silica Plano-Concave Lens, Uncoated
$79.27
Today
LC4357 Support Documentation
LC4357f = -50.0 mm, Ø1/2" UV Fused Silica Plano-Concave Lens, Uncoated
$78.99
5-8 Days
LC4413 Support Documentation
LC4413f = -75.0 mm, Ø1/2" UV Fused Silica Plano-Concave Lens, Uncoated
$78.46
Today
LC4232 Support Documentation
LC4232f = -100.0 mm, Ø1/2" UV Fused Silica Plano-Concave Lens, Uncoated
$78.46
Today
LC4918 Support Documentation
LC4918f = -200.0 mm, Ø1/2" UV Fused Silica Plano-Concave Lens, Uncoated
$78.46
Today

Ø1" (25.4 mm) UV Fused Silica Plano-Concave Lenses, Uncoated

Item # Diameter Focal Length Dioptera Radius of Curvature Center Thickness Edge Thicknessb Back Focal Length Reference
Drawing
LC4252c 1" -30.0 mm -33.3 -13.8 mm 3.0 mm 11.4 mm -32.1 mm Plano-Concave Lens Drawing
LC4513d 1" -75.0 mm -13.3 -34.5 mm 3.5 mm 5.9 mm -77.4 mm
LC4888d 1" -100.0 mm -10.0 -46.0 mm 3.5 mm 5.3 mm -102.4 mm
  • Reciprocal of the Focal Length in Meters
  • Edge Thickness Given Before 0.2 mm at 45° Typical Chamfer
  • Suggested Fixed Lens Mount: LH1(/M)
  • Suggested Fixed Lens Mount: LMR1(/M)
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LC4252 Support Documentation
LC4252f = -30.0 mm, Ø1" UV Fused Silica Plano-Concave Lens, Uncoated
$87.93
Today
LC4513 Support Documentation
LC4513f = -75.0 mm, Ø1" UV Fused Silica Plano-Concave Lens, Uncoated
$86.57
5-8 Days
LC4888 Support Documentation
LC4888f = -100.0 mm, Ø1" UV Fused Silica Plano-Concave Lens, Uncoated
$86.57
5-8 Days
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