Bi-Convex Lens, N-BK7, 50.8 mm Diameter, 75.6 mm EFL, Uncoated

The KBX148 N-BK7 Bi-Convex Lens is an uncoated, 2 inch (50.8 mm) diameter, N-BK7 bi-convex lens with an effective focal length of 75.6 mm. It is designed to meet the demanding requirements of laser electro-optic applications. Newport's N-BK7 precision bi-convex 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
Bi-Convex
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)
75.6 mm
Back Focal Length (BFL)
71.63 mm
Radius of Curvature (R)
76.090 mm
Edge Thickness (Te)
3.0 mm

Principal Plane 1 (P1)
3.97 mm
Principal Plane 2 (P2)
-3.97 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
Bi-Convex
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)
75.6 mm
Back Focal Length (BFL)
71.63 mm
Radius of Curvature (R)
76.090 mm
Edge Thickness (Te)
3.0 mm

Principal Plane 1 (P1)
3.97 mm
Principal Plane 2 (P2)
-3.97 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

3D Product Models

2D Product Drawings

KBX148_ZEMAX(998 B, ZIP)
BI-CONVE-XLE-S(89.3 kB, PDF)

Other

KBX148 RoHS Certificate(706.8 kB, PDF)

Related Products

Compatible

Description	Compatibility
Variable Size Lens Mount, 17.8-57.1 mm, Thumbscrew Support Arms	UNIVERSAL	Learn More
Lens Mount, Self-Centering, 0.125-2.375 in. Diameter Lenses	IMPERIAL	Learn More
Fixed Lens Mount, 2.0 in. (50.8 mm), 8-32 Thread, A-LINE	IMPERIAL	Learn More
Precision Lens Positioner, 2.0 in., 100 TPI XYθXθY, 80 TPI Z	UNIVERSAL	Learn More
Lens Tube, 2 inch dia. LT Series, 3 inch length	UNIVERSAL	Learn More
Fixed Lens Mount, Ø2.0 in. (50.8 mm), M4 Thread, A-LINE	METRIC	Learn More
V-Groove Lens Holder, 0.60 to 3.60 in. Diameter Lenses	UNIVERSAL	Learn More

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