Standard, low aberration beam expanding lens for most routine applications; 415nm to 1064nm. Well-suited to a wide range of beam expansion and aberration-balancing tasks in the visible and near-infrared, these N-BK7 plano-concave lenses reduce aberrations when used at near-infinite conjugate ratio. They are available in a wide range of standard focal lengths and diameters, with optional VIS & NIR broadband or Nd:YAG AR coatings.
Product Code: LPK-C
Optical Material: N-BK7
Diameter Tolerance: +0/-0.10mm
Center Thickness Tolerance: ±0.2mm
Chamfer: 0.05 - 0.20mm at 45° nominal
Flat Annulus Width (?): 0.2mm for Ø ≤ 40mm, 0.4mm for Ø > 40mm (+0/-70%)
Centration: ≤ 3 arc minutes
Paraxial Focal Length: ƒ±2%
Surface Irregularity: < λ/2 p-v at 633nm per surface before coating
Surface Quality: 60-40 scratch-dig per MIL-PRF-13830b
Clear Aperture (CA): Ø–2?
Design Wavelength: 546.1nm
Anti-reflection Coating: Wavelength user specified