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Products & Services  >  Spherical Lenses  >  BK7 Negative Meniscus Lens
BK7 Negative Meniscus Lens
Negative meniscus lenses are designed to minimize spherical aberration.Negative meniscus lenses consist of a convex surface and a concave surface where the concave surface has the greater radius of curvature. In combination with another lens, a negative meniscus lens will decrease the NA of the system. A negative meniscus lens is a common element in beam expanding systems.

Specifications:

Material ..............................................................................BK7

Design Wavelength ......................................................546.1nm

Design Index ..................................................................1.5183

Diameter Tolerance .............................................+0.0/-0.15mm

Paraxial Focal Length ............±2%(f<400mm);±5%(f>=400mm)

Centration .........................................................<3 arc minutes

Clear Aperture ................................................................>90%

Surface Quality ...............................................................60-40

Bevel........................................................................Protective

P/NfΦtctefb
30601-100.025.43.004.50-99.20
30602-125.025.43.004.20-123.70
30603-150.025.43.004.00-149.50
30604-175.025.43.003.80-174.60
●Unit:mm
●Other sizes and coatings are available upon request.