Plano-Concave Lens, N-BK7, 50.8 mm Diameter, -75 mm EFL, Uncoated

The KPC079 N-BK7 Plano-Concave Lens is an uncoated 50.8 mm diameter, N-BK7, plano-concave lens with an effective focal length of -75 mm. It is designed to meet the demanding requirements of laser electro-optic applications. Newport's N-BK7 precision plano-concave lenses are manufactured from fine annealed optical glass and are polished to tight tolerances using master test plates to ensure minimum wavefront distortion.

Specifications

Technical Specs

Lens Shape
Plano-Concave
Diameter
50.8 mm
Lens Material
N-BK7
Antireflection Coating
Uncoated
Surface Quality
40-20 scratch-dig
Surface Accuracy, Irregularity
λ/4
Surface Accuracy, Power
1.5 λ
F/#
-1.4
Effective Focal Length (EFL)
-75 mm
Back Focal Length (BFL)
-76.64 mm
Radius of Curvature (R)
-38.760 mm
Edge Thickness (Te)
9.96 mm
Center Thickness (Tc)
2.5 mm

Principal Plane 2 (P2)
-1.64 mm
Design Wavelength
589 nm
Centration
≤3 arc min
Chamfers
0–0.8 mm face width
Chamfers Angle/Tolerance
45° ±15°, typical
Focal Length Tolerance
±1 %
Diameter Tolerance
+0/-0.1 mm
Center Thickness Tolerance
±0.1 mm
Clear Aperture
≥central 90% of diameter
Cleaning
See How to Clean Optics

Lens Shape
Plano-Concave
Diameter
50.8 mm
Lens Material
N-BK7
Antireflection Coating
Uncoated
Surface Quality
40-20 scratch-dig
Surface Accuracy, Irregularity
λ/4
Surface Accuracy, Power
1.5 λ
F/#
-1.4
Effective Focal Length (EFL)
-75 mm
Back Focal Length (BFL)
-76.64 mm
Radius of Curvature (R)
-38.760 mm
Edge Thickness (Te)
9.96 mm
Center Thickness (Tc)
2.5 mm

Principal Plane 2 (P2)
-1.64 mm
Design Wavelength
589 nm
Centration
≤3 arc min
Chamfers
0–0.8 mm face width
Chamfers Angle/Tolerance
45° ±15°, typical
Focal Length Tolerance
±1 %
Diameter Tolerance
+0/-0.1 mm
Center Thickness Tolerance
±0.1 mm
Clear Aperture
≥central 90% of diameter
Cleaning
See How to Clean Optics

Resources & Downloads

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