Our uncoated UV fused silica precision bi-concave (double-concave) lenses are polished to tight tolerances using master test plates to ensure minimum wavefront distortion for demanding laser collimating applications.
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SBC016 Bi-Concave Lens, Fused Silica, 25.4 mm, -1000 mm EFL, Uncoated |
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$148.00 |
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SBC019 Bi-Concave Lens, Fused Silica, 25.4 mm, -250 mm EFL, Uncoated |
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$148.00 |
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SBC022 Bi-Concave Lens, Fused Silica, 25.4 mm, -200 mm EFL, Uncoated |
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$141.00 |
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SBC025 Bi-Concave Lens, Fused Silica, 25.4 mm, -150 mm EFL, Uncoated |
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$141.00 |
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SBC028 Bi-Concave Lens, Fused Silica, 25.4 mm, -100 mm EFL, Uncoated |
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$137.00 |
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SBC031 Bi-Concave Lens, Fused Silica, 25.4 mm, -75 mm EFL, Uncoated |
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$137.00 |
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SBC034 Bi-Concave Lens, Fused Silica, 25.4 mm, -50 mm EFL, Uncoated |
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$137.00 |
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UV Grade Fused Silica is synthetic amorphous silicon dioxide of extremely high purity providing maximum transmission from 195 to 2100 nm. This non-crystalline, colorless silica glass combines a very low thermal expansion coefficient with good optical qualities, and excellent transmittance in the ultraviolet region. Transmission and homogeneity exceed those of crystalline quartz without the problems of orientation and temperature instability inherent in the crystalline form. It will not fluoresce under UV light and is resistant to radiation. For high-energy applications, the extreme purity of fused silica eliminates microscopic defect sites that could lead to laser damage. For more information, refer to our optical materials Technical Note
Our AR.10 broadband multilayer antireflection coating markedly improves the transmission efficiency of UVFS lenses in the 245 to 440 nm ultraviolet region.
Uncoated lenses are used in optical systems and devices because they have an exceptionally wide wavelength range, a high damage threshold ratio, and without the expense of coatings, are always less expensive than their coated counterparts. Further, uncoated lenses give camera images a “vintage” look, which is becoming popular in cinema film production.
Standard double concave effective focal lengths provide a systematic approach allowing for lenses of different sizes and materials to be interchanged without requiring other changes to your optical system.
Bi-Concave lenses are the best choice where object and image are at absolute conjugate ratios closer to 1:1 with converging input beam. The output rays appear to be diverging from a virtual image located on the object side of the lens. The distance from this virtual point to the lens is known as the focal length. Similar to the Plano-Concave lenses, the Bi-concave lenses have negative focal lengths, thereby causing collimated incident light to diverge. Bi-Concave lenses have equal radius of curvature on both side of the lens. They are generally used to expand light or increase focal length in existing systems, such as beam expanders and projection systems.
We offer a full range of optical lens mounts to meet various experimental requirements. Below lists the recommended mounts for spherical lenses of standard sizes. Please see our Lens Mount Guide for additional information.
Note: besides the diameter, please check the Edge Thickness (Te) specification of the lens and the lens mount to ensure compatibility before purchasing.
| Lens Diameter |  A-Line™ Lens Mounts |
 LT Series Lens Tubes |
 LP Series Lens Positioners |
 Optics Cage Plus Series |
|---|---|---|---|---|
| 76.2 mm | ( |
N/A | N/A | N/A |
| 50.8 mm | ( |
N/A | ||
| 38.1 mm | ( |
LT20 lens tube with |
LP-2 lens positioner with |
N/A |
| 25.4 mm | ( |
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| 12.7 mm | ( |
N/A | ||
| 6.35 mm | LT05 lens tube with |
LP-05 lens positioner with |
N/A |
For non-standard sizes not listed above, check out our variable size lens mounts.
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