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UV Fused Silica Bi-Concave Lenses, Uncoated


  • Supported by the Zemax Optical Design Package
  • Spectral Operating Range: 185 nm - 2.1 µm
  • Negative Focal Length

LD4148

Ø6 mm

LD4014

Ø9 mm

LD4771

Ø1/2"

LD4931

Ø1"

Related Items


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Common Specifications
Lens Shape Convex/Convex
Substrate Material UV Grade Fused Silicaa 
Wavelength Rangeb 185 nm - 2.1 μm
Diameters Available 6 mm, 9 mm, 1/2", or 1"
Diameter Tolerance +0.00 mm / -0.10 mm
Thickness Tolerance ±0.1 mm
Design Wavelength 587.6 nm
Index of Refraction (@ Design λ) 1.460
Surface Quality 40-20 (Scratch-Dig)
Spherical Surface Power 3 Fringes
Spherical 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 a UV AR coating for the 245 - 400 nm range.
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

  • 4 Different Diameters Available: 6 mm, 9 mm, 1/2", or 1"
  • Wavelength Range: 185 nm - 2.1 μm (uncoated)
  • Focal Lengths Available from -6.0 to -100.0 mm
  • Fabricated from UV Grade Fused Silica

Thorlabs' UV Grade Fused Silica Bi-Concave Lenses are available either uncoated or with a UV antireflection coating for the 245 - 400 nm range deposited on both surfaces. 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-concave lenses have negative focal lengths, making them useful for a wide range of applications. They are often used to increase the divergence of a converging 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. 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 the incident light to diverge, it is usually preferable to choose a bi-concave lens if the absolute conjugate ratio (object distance divided by image distance) is close to 1. When the desired absolute magnification is either less than 0.2 or greater than 5, the tendency is to choose a plano-concave lens instead.

Thorlabs offers bi-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.

Optic Cleaning Tutorial
Lens Tutorial
Optical Coatings Guide
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.

UVFS TransmissionClick to Enlarge
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 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:
user  (posted 2017-09-28 08:28:43.093)
Hello, I want using this type of lenses in experiments where are involved femtosecond lasers. My question is: Which is the LIDT value in femtosecond regime for this lenses? Thank you in advance!
tfrisch  (posted 2017-10-02 07:10:13.0)
Hello, thank you for contacting Thorlabs. The damage mechanism for a fs source will be different for a fs pulse vs a ns or cw source (avalanche ionization vs dielectric breakdown vs thermal damage). I would not expect any of the listed specs to be accurate for a fs source. Please reach out to TechSupport@Thorlabs.com directly to discuss the specs of your source and we may be able to make a recommendation on suitable optics.
abanishev  (posted 2017-02-27 13:30:02.643)
Good Day, What type of fused silica substrate is used for lenses: LD4797 and LA4966? What is the purity of this substrate? Best, Alexandr Banishev IPG Photonics
jlow  (posted 2017-03-02 10:38:46.0)
Response from Jeremy at Thorlabs: The lenses are made from UV grade fused silica. We do not directly specify the purity of the glass; we specify the refractive index and abbe number of the glass instead. I will contact you directly to provide more information.
ledwardl  (posted 2017-01-28 14:07:57.05)
Trying to make a fused silica barlow (2X or 3X magnification) for astronomical UV imaging. What would I need to house the LD4293 in so that it can fit the common 1.25" barrel size used for telescope accessories and draw tubes? Thanks.
tfrisch  (posted 2017-02-16 02:34:52.0)
Hello, thank you for contacting Thorlabs. I will reach out to you directly about the 1.25" standard your application requires.

Ø6 mm UV Fused Silica Bi-Concave Lenses, Uncoated

Item # Diameter Focal Length Dioptera Radius of Curvature Center Thickness Edge Thicknessb Back Focal Lengthc Reference
Drawing
LD4797 6.0 mm -6.0 mm -166.7 -5.9 mm 2.5 mm 4.1 mm -6.8 mm Bi-Concave Lens Drawing
LD4148 6.0 mm -12.0 mm -83.3 -11.5 mm 3.0 mm 3.8 mm -13.0 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
  • Measured at the Design Wavelength, 587.6 nm
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LD4797 Support Documentation
LD4797f = -6.0 mm, Ø6 mm UV Fused Silica Bi-Concave Lens, Uncoated
$92.52
Today
LD4148 Support Documentation
LD4148f = -12.0 mm, Ø6 mm UV Fused Silica Bi-Concave Lens, Uncoated
$75.21
Today

Ø9 mm UV Fused Silica Bi-Concave Lenses, Uncoated

Item # Diameter Focal Length Dioptera Radius of Curvature Center Thickness Edge Thicknessb Back Focal Lengthc Reference
Drawing
LD4271 9.0 mm -9.0 mm -111.1 -8.7 mm 2.5 mm 5.0 mm -9.8 mm Bi-Concave Lens Drawing
LD4014 9.0 mm -18.0 mm -55.6 -17.0 mm 3.0 mm 4.2 mm -19.0 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
  • Measured at the Design Wavelength, 587.6 nm
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LD4271 Support Documentation
LD4271f = -9.0 mm, Ø9 mm UV Fused Silica Bi-Concave Lens, Uncoated
$94.69
Today
LD4014 Support Documentation
LD4014f = -18.0 mm, Ø9 mm UV Fused Silica Bi-Concave Lens, Uncoated
$76.29
Today

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

Item # Diameter Focal Length Dioptera Radius of Curvature Center Thickness Edge Thicknessb Back Focal Lengthc Reference
Drawing
LD4771 1/2" -15.0 mm -66.6 -14.3 mm 3.0 mm 6.0 mm -16.0 mm Bi-Concave Lens Drawing
LD4269 1/2" -30.0 mm -33.3 -28.1 mm 3.0 mm 4.5 mm -31.0 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
  • Measured at the Design Wavelength, 587.6 nm
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LD4771 Support Documentation
LD4771f = -15.0 mm, Ø1/2" UV Fused Silica Bi-Concave Lens, Uncoated
$93.61
Today
LD4269 Support Documentation
LD4269f = -30.0 mm, Ø1/2" UV Fused Silica Bi-Concave Lens, Uncoated
$89.01
Today

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

Item # Diameter Focal Length Dioptera Radius of Curvature Center Thickness Edge Thicknessb Back Focal Lengthc Reference
Drawing
LD4931d 1" -25.0 mm -40.0 -23.5 mm 3.0 mm 10.5 mm -26.0 mm Bi-Concave Lens Drawing
LD4293e 1" -50.0 mm -20.0 -46.6 mm 3.5 mm 7.0 mm -51.2 mm
LD4735e 1" -75.0 mm -13.3 -69.6 mm 3.5 mm 5.8 mm -76.2 mm
LD4103e 1" -100.0 mm -10.0 -92.6 mm 3.5 mm 5.3 mm -101.2 mm
  • Reciprocal of the Focal Length in Meters
  • Edge Thickness Given Before 0.2 mm at 45° Typical Chamfer
  • Measured at the Design Wavelength, 587.6 nm
  • Suggested Mount: Mount Optic in SM1L05 Lens Tube and Connect to LMR1(/M) Fixed Lens Mount
  • 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
LD4931 Support Documentation
LD4931f = -25.0 mm, Ø1" UV Fused Silica Bi-Concave Lens, Uncoated
$120.12
Today
LD4293 Support Documentation
LD4293f = -50.0 mm, Ø1" UV Fused Silica Bi-Concave Lens, Uncoated
$54.92
Today
LD4735 Support Documentation
LD4735f = -75.0 mm, Ø1" UV Fused Silica Bi-Concave Lens, Uncoated
$96.58
Today
LD4103 Support Documentation
LD4103f = -100.0 mm, Ø1" UV Fused Silica Bi-Concave Lens, Uncoated
$46.27
Today
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