Products Home / Optical Elements / Optical Lenses / Spherical Singlet Lenses / Bi-Convex Spherical Lenses / UV Fused Silica Bi-Convex Spherical Lenses / UV Fused Silica Bi-Convex Lenses, UncoatedUV 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.
| 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.
| 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: | |
| No Comments Posted |
| 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 |  |
| 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 |
| 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 | |
| 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 |
| 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 | |
| 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 |
| 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 | |
| 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 |
 UV Fused Silica, Uncoated |