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Positive Meniscus & Negative Meniscus Lenses

Positive meniscus lenses are designed to minimize spherical aberration and are usually used in small f number applications (f # <2.5). For 2.5 f #<10, meniscus lenses can also improve image quality and reduce spot size. Positive meniscus lenses have greater curvature (shorter radius of curvature) on the convex side and a smaller curvature (longer radius of curvature) on the concave side.

Negative Meniscus lenses are offered as an alternative to other negative lenses and are particularly appropriate for the high index IR materials. They are commonly used in beam expanding applications where minimal spherical aberration is desired. Negative meniscus lenses have greater curvature (shorter radius of curvature) on the concave side and a smaller curvature (longer radius of curvature) on the convex side.

RMI Meniscus Lenses are designed to customers requirements.

Both sides can be coated with an RMI high efficiency narrowband, anti-reflective coating.

RMI Standard Spcifications
Materials:
BK7, UVFS, FS, CaF2, MgF2, BaF2, Sapphire, Si, ZnSe, Ge, Cleartran, All Glass, All Crystals
Surface Figure:
BK7, UVFS, FS:
CaF2, MgF2, BaF2:
ZnSe, ZnS, Ge, Si, Cleartran:
Sapphire (2 grades):
Both Surfaces
λ/10 at 633 nm
λ/4 at 633 nm

λ/20 at 10.6 µm
λ/10, or λ/4 at 633 nm
Surface Quality:
BK7, UVFS, FS:
CaF2, MgF2, BaF2:
ZnSe, ZnS, Ge, Si, Cleartran:
Sapphire (2 grades):
Both Surfaces
10-5
20-10
40-20
20-10 or 60-40
Diameter Tolerance:
+ 0.000", – 0.010"
Thickness Tolerance:
± 0.010"
Focal Length
Tolerance:
± 0.5%
Centration Error:
< 3 arc minutes
Bevels:
0.010" – 0.030" at 45º
Clear Aperture:
Central 85% of diameter
Positive Meniscus Lens
Negative Meniscus Lens
Applicable Coatings Quick Links
UV / Excimer Coatings:

Narrowband Anti-Reflection (NAR)
VIS / NIR Coatings:
Single Layer Anti-Reflection (SAR)
Narrowband Anti-Reflection (NAR)
Broadband Anti-Reflection (BAR)
Infrared Coatings:
Narrowband Anti-Reflection (NAR)
Broadband Anti-Reflection (BAR)

 
Call 303-664-5000 to discuss your optical requirements
Toll Free: 1-866-678-4270 Fax: 303-664-5001 Email: Sales@RMIco.com
Rocky Mountain Instrument Co. • 106 Laser Dr., Lafayette, CO • 80026 • USA

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Due to their potential strategic high value, export of RMI products and related technical data may be subject to U.S. or other export licensing requirements.
Please consult your export control administrator or contact RMI for more information.

RMI Settles Export Case
 
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