• Spherical Surface Power: 3 Fringes
• Spherical Surface Irregularity: λ/4
• Coating: C-Coated

This Positive Meniscus lens is used to decrease the focal length of another lens while maintaining the angular resolution of the optical assembly. This lens is commonly used to achieve tighter beam focusing paired with another positive lens.

Positive meniscus lenses are designed to minimize spherical aberration. One surface of the lens is convex, while the other surface is concave. When used in combination with another lens, a positive meniscus lens will shorten the focal length, and increase the NA of the system. When used to focus a collimated beam the convex side of the lens should face the source to minimize spherical aberration.

• Lens Shape: Positive Meniscus
• Substrate Material: N-BK7
• Wavelength Range: 1050 - 1620 nm
• Design Wavelength: 587.6 nm
• Index of Refraction @ 633 nm: 1.515082
• Diameter Tolerance: +0.00/-0.10 mm
• Focal Length Tolerance: ± 1%
• Surface Quality: 40/20 Scratch/Dig
• Centration: ≤3 arcmin
• Clear Aperture: >90%
• Diameter: 25.4 mm
• f: 200.0 mm
• R₁: 66.2 mm
• R₂: 182.2 mm
• Center Thickness t_c: 2.8 mm
• Edge Thickness t_e: 2.0 mm
• Back Focal Length f_b: 197.1 mm
• Suggested Mount: LMR1