UV Fused Silica Bi-Concave Lenses, Uncoated
| Common Specifications |
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| Lens Shape | Convex/Convex | | Substrate Material | UV Grade Fused Silica | | Wavelength Range* | 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% |
*These lenses are also available with a UV AR coating for the 290-370 nm range. 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 290 - 370 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 divergance 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 preferrable 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.
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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. 
Click Here for Raw Data
Click to Enlarge
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| Recommended Mounting Options for Ø6 mm Lenses |
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| Item # | Description | | LMR05 with LMRA6 | Lens Mount for Ø1/2" Optics with Ø6 mm Optic Adapter | | LH1 | Adjustable Lens Mount: 0.2" (5 mm) to 1.82" (46 mm) | | SCL03 | Self-Centering Lens Mount, Ø0.15" (3.8mm) to Ø1.7" (43mm) | | SCL04 | Self-Centering Lens Mount, Ø0.15" (3.8mm) to Ø3.0" (76mm) | | Recommended Mounting Options for Ø9 mm Lenses |
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| Item # | Description | | LMR05 with LMRA9 | Lens Mount for Ø1/2" Optics with Ø9 mm Optic Adapter | | LH1 | Adjustable Lens Mount: 0.2" (5 mm) to 1.82" (46 mm) | | SCL03 | Self-Centering Lens Mount, Ø0.15" (3.8mm) to Ø1.7" (43mm) | | SCL04 | Self-Centering Lens Mount, Ø0.15" (3.8mm) to Ø3.0" (76mm) | | Recommended Mounting Options for Ø1/2" (12.7 mm) Lenses |
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| LH1 | Adjustable Lens Mount: 0.2" (5 mm) to 1.82" (46 mm) | | SCL03 | Self-Centering Lens Mount, Ø0.15" (3.8mm) to Ø1.7" (43mm) | | SCL04 | Self-Centering Lens Mount, Ø0.15" (3.8mm) to Ø3.0" (76mm) | | LMR05* | Fixed Lens Mount for Ø1/2" Optics | | LMR05S | Ø1/2" Lens Mount with Internal and External SM05 Threads | | SM05 Lens Tubes | Thorlabs offers a range of lens tube designs and lengths | | LM05XY or LM05XY/M | Translating Lens Mount for Ø1/2" Optics | | SCP05 | 16 mm Cage-System-Compatible XY Translator for Ø1/2" Optics | | Recommended Mounting Options for Ø1" (25.4 mm) Lenses |
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| LH1 | Adjustable Lens Mount: 0.2" (5 mm) to 1.82" (46 mm) | | LH2 | Adjustable Lens Mount: 0.75" (19 mm) to 2.25" (57 mm) | | SCL03 | Self-Centering Lens Mount, Ø0.15" (3.8mm) to Ø1.7" (43mm) | | LMR1** | Fixed Lens Mount for Ø1" Optics | | LMR1S | Ø1" Lens Mount with Internal and External SM1 Threads | | SM1 Lens Tubes | Thorlabs offers a range of lens tube designs and lengths | | LM1XY or LM1XY/M | Translating Lens Mount for Ø1" Optics | | HPT1 | 30 mm Cage-System-Compatible XY Translator for Ø1" Optics | | VG100 | Adjustable-Height Optic Clamp |
*Due to its edge thickness, the LD4771 requires an SM5L03 to be used with the LMR05.
**Due to its edge thickness, the LD4931 requires an SM1L05 to be used with the LMR1. |
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Additional Bi-Concave Spherical Lenses
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UV Fused Silica, Uncoated Bi-Concave Lenses
