• Material: N-BK7
• Wavelength Range: 1050 - 1620 nm
• Coating: C-Coated
• Diameter: Ø50.8 mm
• Offers Excellent Transmittance Throughout the Visible and Near Infrared

This Plano-Concave lens, which is fabricated from RoHS-compliant N-BK7 glass, is available C-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. However, for particularly harsh environments where the optic will be exposed to alkalis and acids, consider our N-SF11 plano-concave lenses.

• Lens Shape: Plano/Concave
• Material: N-BK7 (Grade A)
• Wavelength Range: 1050 - 1620 nm
• Design Wavelength: 633 nm
• Index of Refraction: @633 nm 1.515
• Surface Quality: 40-20 Scratch-Dig
• Surface Flatness (Plano Side): ?/2
• Spherical Surface Power (Convex Side): 3?/2
• Surface Irregularity: ?/4
• Abbe Number: v_d=64.17
• Centration: =3 arcmin
• Clear Aperture: >90% of Diameter
• Focal Length Tolerance: ±1%
• Diameter: 50.8 mm
• f: -75 mm
• R: -38.6 mm
• t_c: 3.5 mm
• t_e: 13.0 mm
• f_b: -77.3 mm
• Suggested Mount: LH2 or LMR2 and SM2L05