The PAC079 Visible Achromatic Doublet Lens is a 400 to 700 nm antireflection coated, 1.5 inch (38.1 mm) diameter, N-BK7 and N-SF5 precision achromatic doublet lens with an effective focal length of 250 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 38.1 mm
- Antireflection Coating 400-700 nm
- Coating Type Visible Single-Layer MgF2
- Damage Threshold 1.0 J/cm2 @ 1064 nm, 10 ns , 10 Hz
- Transmission T>95%
- 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) 250 mm
- Back Focal Length (BFL) 244.6 mm
- F/# 6.6
- Radius of Curvature (R) 151.578 mm
- Radius 2 -112.149 mm
- Radius 3 -336.340 mm
- Edge Thickness (Te) 9.8 mm
- Center Thickness (Tc) 11.5 mm
- Thickness, Center 1 7.5 mm
- Thickness, Center 2 4.0 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
- Clear Aperture 90% of central diameter
- Cleaning See How to Clean Optics
