| Negative Meniscus Lens, N-BK7, Minimize Spherical Aberration Lens Overview:
Negative meniscus (convex-concave) lens is designed to minimize spherical aberration in optical systems. When used in combination with another lens, a negative meniscus lens will increase the focal length and decrease the numerical aperture (NA) of the system without introducing significant spherical aberration. When used to diverge light, the convex surface should face the beam to minimize spherical aberration. Star Optic provides positive meniscus lenses in a variety of substrates and anti-reflection coating options.
General Specifications Of N-NK7 Negative Meniscus Lens:
| Material | N-BK7, UV FS, N-SF11, CaF2, Si, Ge, ZnSe, Sapphire |  | | Design Wavelength | 546.1nm | | Surface Flatness | N<3(0.5)@632.8nm | | Surface Quality | 60/40 scratch-Dig | | Diameter Tolerance | +0/-0.2mm | | Thickness Tolerance | ±0.2mm | | Centration | <3 arc minutes | | Focal Length Tolerance | ±2% | | Clear Aperture | >90% | | Chamfer | Protective<0.5mmx45° |
Standard Products Of N-NK7 Negative Meniscus Lens: | Part No. | Material | D
(mm) | f
(mm) | R1
(mm) | R2
(mm) | Tc
(mm) | Te
(mm) | Fb
(mm) | | NMEND25F-100 | N-BK7 | 25.4 | -100 | 100 | 33.7 | 3 | 4.7 | -98.7 | | NMEND25F-150 | N-BK7 | 25.4 | -150 | 100 | 43.1 | 3 | 4.1 | -148 | | NMEND25F-200 | N-BK7 | 25.4 | -200 | 100 | 50.2 | 3 | 3.8 | -197.3 | | NMEND25F-300 | N-BK7 | 25.4 | -300 | 250 | 95.1 | 3 | 3.5 | -297.8 | | NMEND25F-400 | N-BK7 | 25.4 | -400 | 250 | 112.5 | 3 | 3.4 | -397 | | NMEND25F-500 | N-BK7 | 25.4 | -500 | 250 | 126.3 | 3 | 3.3 | -496.3 | | NMEND25F-1000 | N-BK7 | 25.4 | -1000 | 500 | 253.2 | 3 | 3.2 | -994.6 |
Coating Options Of N-NK7 Negative Meniscus Lens: Star Optic's above standard negative meniscus lenses are uncoated. In order to reduce the amount of light reflected from each surface of the lens, antireflection coatings including singer layer MgF2, multi-layer AR coating, Broadband multi-layer AR coating and Dual wavelength AR coating are also available. | Single Layer MgF2 Coating | Multi-layer Anti-Reflective Coating |  |  | | Boradband Anti-Reflective Coating | Dual Wavelength Anti-Reflective Coating |  |  | Mounting Options For Negative Meniscus Lens: Star Optic's above standard negative meniscus lenses are not mounted. However, we can provide fixed mount and adjustable mount for our lenses. | Fixed Lens Mount 
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| | Adjustable Lens Mount 
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| Custom Your Own Lens: You have your full design freedom, and we are able to work with complex designs to get you exactly what you need including optical design, mechanical design and optical coating design. | Zemax Deisgn 
| Zemax Deisgn 
| | Solidworks Design 
| Thin Film Coating Design 
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