• Material: N-BK7
• AR Coated for the 1050 - 1620 nm Range
• Ø50.8 mm
• Focal Length: 150 mm
• Well Suited for Many Finite Imaging Applications
• Spherical Surface Power: 3 Fringes
• Spherical Surface Irregularity: λ/4

Thorlabs' C-Coated N-BK7 Bi-Convex Lens is fabricated from N-BK7 and features an antireflecton coating for the 1050 - 1620 nm range on both surfaces. 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.

Bi-convex lenses are popular for many finite imaging applications. This type of lens is best suited for use in situations where the object and image are on opposite sides of the lens and the ratio of the image and object distances (conjugate ratio) is between 0.2 and 5. This lens is designed to have a focal length of f= (R1*R2)/((n-1)*(R2-R1)).

• Lens Shape: Convex/Convex
• Material: N-BK7 (Grade A)
• Wavelength Range: 350 nm - 2.0 µm (Uncoated)
• Design Wavelength: 633 nm
• Index of Refraction: 1.515 (@ 633 nm)
• Surface Quality: 40-20 Scratch-Dig
• Abbe Number: v_d=64.17
• Centration: ≤3 arcmin
• Clear Aperture: >90% of Diameter
• Diameter Tolerance: +0.00 mm / -0.10 mm
• Focal Length Tolerance: ±1%
• Diameter: 50.8 mm
• f: 150 mm
• R: 153.3 mm
• t_c: 7.2 mm
• t_e: 3 mm
• f_b: 147.6 mm
• Suggested Fixed LensMount: LMR2