• Material: N-BK7 (Grade A), Abbe Number of 64.17
• AR-Coated for the 350 - 700 nm Range
• Ø25.4 mm Plano-Convex Spherical Singlet Lenses

The LA1708-A Plano-Convex Lens is fabricated from RoHS-compliant BK7 glass (N-BK7) and features an anti-reflection coating for the 350 to 700 nm range. 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.

Plano-convex lenses focus a collimated beam to the back focus and collimate light from a point source. This lens has a positive focal length and near-best-form shape for infinite and finite conjugate applications. The lens is fabricated from N-BK7, which has an Abbe Number of 64.17; this value is an indicator of the dispersion.

• Lens Shape: Plano / Convex
• Design Wavelength: 633 nm
• Wavelength Range: 350 – 700 nm (-A Coating)
• Index of Refraction at 633 nm: 1.515
• Surface Quality: 40-20 Scratch-Dig
• Damage Threshold: 7.5 J/cm² (at 532 nm, 10 ns, 10 Hz, Ø0.504 mm)
• 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: 25.4 mm
• f: 200 mm
• R: 103 mm
• tc: 2.8 mm
• te: 2 mm
• fb: 198.2 mm
• Suggested Fixed Lens Mount: LMR1