• Ø1" Negative Meniscus Lenses
• Wavelength Range: 350 - 700 nm (A-Coated)
• Fabricated from N-BK7 Glass
• Coating: A-Coated
• Focal Length: -100.0 mm
• Spherical Surface Power: 3 Fringes
• Spherical Surface Irregularity: λ/4

This Negative Meniscus Lens is fabricated from RoHS-compliant BK7 glass (N-BK7) and is available A-Coated. N-BK7 is probably the most common optical glass used for high quality optical components. It is typically chosen whenever the additional benefits of UV fused silica (i.e., good transmission further into the UV and a lower coefficient of thermal expansion) are not necessary.

Negative meniscus (convex-concave) lenses, which are thinner in the middle than at the edges and cause light rays to diverge, are designed to minimize third-order spherical aberration. When used to diverge light the convex surface should face the beam to minimize spherical aberration. They are often used in conjunction with other lenses to increase the focal length, and therefore decrease the numerical aperture, of an optical assembly.

• Material: N-BK7
• Wavelength Range: 350 - 700 nm
• Design Wavelength: 633 nm, n=1.515082
• Dia. Tolerance: +0.00 / -0.10 mm
• Focal Length Tolerance: 1%
• Surface Quality: 40/20 Scratch/Dig
• Centration: ≤3 arcmin
• Clear Aperture: >90%
• DIA: 25.4 mm
• f: -100.0 mm
• R₁: 100.0 mm
• R₂: 33.7 mm
• Center Thickness t_c: 3.0 mm
• Edge Thickness t_e: 4.7 mm
• Back Focal Length f_b: -99.0 mm