Achromatic Doublet Lens, Visible, 12.7 mm, 50.8 mm EFL, 430-700 nm
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.
Specifications
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
1.5 λ
Effective Focal Length (EFL)
50.8 mm
Back Focal Length (BFL)
48.8 mm
Radius of Curvature (R)
30.856 mm
Radius 2
-22.713 mm
Radius 3
-67.617 mm
Edge Thickness (T<sub>e</sub>)
3.5 mm
Center Thickness (T<sub>c</sub>)
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
≤3 arc min
Diameter Tolerance
+0/-0.1 mm
Focal Length Tolerance
±2.0%
Center Thickness Tolerance
±0.2 mm
Cleaning
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
1.5 λ
Effective Focal Length (EFL)
50.8 mm
Back Focal Length (BFL)
48.8 mm
Radius of Curvature (R)
30.856 mm
Radius 2
-22.713 mm
Radius 3
-67.617 mm
Edge Thickness (T<sub>e</sub>)
3.5 mm
Center Thickness (T<sub>c</sub>)
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
≤3 arc min
Diameter Tolerance
+0/-0.1 mm
Focal Length Tolerance
±2.0%
Center Thickness Tolerance
±0.2 mm
Cleaning
