The PAC028AR.14 Visible Achromatic Doublet Lens is a 430 to 700 nm antireflection coated, 1/2 inch (12.7 mm) diameter, N-BK7 and N-SF5 precision achromatic doublet lens with an effective focal length of 50.8 mm. This achromat is computer designed to effectively minimize spherical aberration and coma when operating at infinite conjugate ratio, yielding smaller focused spot sizes. Unlike singlet lenses, this results in a constant focal length independent of aperture and far better off-axis performance. Achromats are superior to singlet lenses for monochromatic applications at any visible wavelength.
Технические характеристики
- Lens Type Achromatic Doublet
- Lens Shape Plano-Convex
- Diameter 12.7 mm
- Antireflection Coating 430-700 nm
- Coating Type Visible Multilayer
- Coating Code AR.14
- Damage Threshold 1.0 J/cm2 @ 1064 nm, 10 ns , 10 Hz
- Transmission T>97%
- Lens Material N-BK7/N-SF5
- Surface Quality 40-20 scratch-dig
- Surface Accuracy, Irregularity λ/4
- Surface Accuracy, Power 1.5 &lambda,
- Effective Focal Length (EFL) 50.8 mm
- Back Focal Length (BFL) 48.8 mm
- F/# 4
- Radius of Curvature (R) 30.856 mm
- Radius 2 -22.713 mm
- Radius 3 -67.617 mm
- Edge Thickness (Te) 3.5 mm
- Center Thickness (Tc) 4.5 mm
- Thickness, Center 1 3.0 mm
- Thickness, Center 2 1.5 mm
- Orientation Steepest convex surface should face the infinite conjugate
- Design Wavelengths 589 nm
- Centration &le,3 arc min
- Diameter Tolerance +0/-0.1 mm
- Focal Length Tolerance ±2.0%
- Center Thickness Tolerance ±0.2 mm
- Cleaning See How to Clean Optics
