Bi-Convex Lens, N-BK7, 50.8 mm Diameter, 38.1 mm EFL, Uncoated

The KBX139 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 38.1 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/#
0.7
Effective Focal Length (EFL)
38.1 mm
Back Focal Length (BFL)
28.54 mm
Radius of Curvature (R)
34.442 mm
Edge Thickness (Te)
3.0 mm

Principal Plane 1 (P1)
9.55 mm
Principal Plane 2 (P2)
-9.55 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/#
0.7
Effective Focal Length (EFL)
38.1 mm
Back Focal Length (BFL)
28.54 mm
Radius of Curvature (R)
34.442 mm
Edge Thickness (Te)
3.0 mm

Principal Plane 1 (P1)
9.55 mm
Principal Plane 2 (P2)
-9.55 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

KBX139_ZEMAX(997 B, ZIP)
BI-CONVE-XLE-S(89.3 kB, PDF)

Other

KBX139 RoHS Certificate(707.7 kB, PDF)

Related Products

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Description	Compatibility
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Compatible

Description	Compatibility
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Lens Tube, 2 inch dia. LT Series, 3 inch length	UNIVERSAL	Learn More
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