• Material: N-BK7 (Grade A), Abbe Number of 64.17
• Wavelength Range: 350 nm - 2.0 µm (Uncoated)
• Diameters: Ø12.7 mm
• Offers Excellent Transmittance Throughout the Visible and Near Infrared

The N-BK7 Plano-Convex Lens is fabricated from RoHS-compliant BK7 glass (N-BK7). 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.

Like all plano-convex lenses, this lens has a positive focal length of 20 mm, and a near-best-form shape for infinite and finite conjugate applications. This lens can be used to converge collimated beams or collimate light from a point source. To minimize the introduction of spherical aberration, a collimated light source should be incident on the curved surface of the lens when being focused and a point light source should be incident on the planar surface when being collimated.

• Lens Shape: Plano / Convex
• Design Wavelength: 633 nm
• Index of Refraction at 633 nm: 1.515
• Surface Quality: 40-20 Scratch-Dig
• Surface Flatness: λ/2
• Spherical Surface Power (Convex side): 3λ/2
• Surface Irregularity: λ/4
• Abbe Number: vd=64.17
• Centration: =3 arcmin
• Clear Aperture: >90% of Diameter
• Focal Length Tolerance: ±1%
• Diameter: 12.7 mm
• f: 20 mm
• R: 10.3 mm
• tc: 4 mm
• te: 1.8 mm
• fb: 17.4 mm
• Suggested Fixed Lens Mount: LMR05