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 Specificationsa | |
|---|---|
| Lens Shape | Convex/Convex |
| Substrate Material | UV-Grade Fused Silicaa |
| Diameters Available | 5 mm, 6 mm, 1/2", 1", or 2" |
| Diameter Tolerance | +0.0 mm / -0.1 mm |
| Thickness Tolerance | ±0.1 mm |
| Clear Aperture | >90% of Diameter |
| Design Wavelength | 588 nm |
| Index of Refraction | 1.460 @ 588 nm |
| Surface Quality | 40-20 Scratch-Dig |
| Spherical Surface Powerb | 3λ/2 |
| Spherical Surface Irregularityb | λ/4 |
| Centration | ≤3 arcmin |
| Focal Length Tolerance | ±1% |
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.
| Bi-Convex Lens Selection Guide | |
|---|---|
| N-BK7 | |
| Mounted N-BK7 | |
| UV Fused Silica | |
| CaF2 | |
| ZnSe | -E3 (7 - 12 µm) |
Custom coatings are also available. Please contact Tech Sales for a quote.
| 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) |
| CXY1A | 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 |
| SCL60CA | 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: | |
Lei Zhou
(posted 2023-06-01 15:43:48.583) 1. 有没有透镜两边的焦距不同？
2. 如果我是光纤束（出光直径4.58mm），通过双凸透镜可以聚焦吗？需要推荐哪一款透镜？对焦距没有特殊要求。 cdolbashian
(posted 2023-06-23 08:47:58.0) Thank you for reaching out to us with this inquiry. To translate this to English and will reply in both languages:
Chinese reply:
Customer Feedback:
1. Are there lenses which have different focal lengths on both sides?
2. If I am [using] a fiber optic bundle (light output diameter 4.58mm), can it be focused through a biconvex lens? Which lens do you recommend? There are no special requirements for focal length.
Thanks for contacting Thorlabs! Our aspheric lens pairs have different focal lengths on both sides. Ideally a symmetric biconvex lens with the optic placed at 2f would have a 1:1 relay to the next 2f position, but of course it would not be perfect due to typical optical aberrations. A Tech from China will contact you directly to discuss your application requirements.
感谢联系Thorlabs! 我司的非球面透镜对的两侧焦距不同。理想情况下，将物放在双凸透镜的两倍焦距处，在另一侧的两倍焦距处可以获得1:1的像，但受像差影响，实际效果不一定理想。来自中国的技术支持同事将直接联系您，进一步讨论您的应用需求。 |
| Item # | Diameter | Focal Lengtha | Diopterb | Radius of Curvature | Center Thickness | Edge Thickness | Back Focal Lengtha | 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 Lengtha | Diopterb | Radius of Curvature | Center Thickness | Edge Thickness | Back Focal Lengtha | 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 Lengtha | Diopterb | Radius of Curvature | Center Thickness | Edge Thickness | Back Focal Lengtha | 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 mm | |
| 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 Lengtha | Diopterb | Radius of Curvature | Center Thickness | Edge Thickness | Back Focal Lengtha | 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