Bi-Concave Lens, N-BK7, 25.4 mm Diameter, -25 mm EFL, Uncoated

The KBC046 Bi-Concave Lens is an uncoated 25.4 mm diameter N-BK7 Bi-concave lens with an effective focal length of -25 mm. It is designed to meet the demanding requirements of laser electro-optic applications. Newport's N-BK7 precision bi-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
Bi-Concave
Diameter
25.4 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/#
-0.9
Effective Focal Length (EFL)
-25 mm
Back Focal Length (BFL)
-25.81 mm
Radius of Curvature (R)
-26.259 mm
Edge Thickness (Te)
7.74 mm

Principal Plane 1 (P1)
0.81 mm
Principal Plane 2 (P2)
-0.81 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-Concave
Diameter
25.4 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/#
-0.9
Effective Focal Length (EFL)
-25 mm
Back Focal Length (BFL)
-25.81 mm
Radius of Curvature (R)
-26.259 mm
Edge Thickness (Te)
7.74 mm

Principal Plane 1 (P1)
0.81 mm
Principal Plane 2 (P2)
-0.81 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

KBC046_ZEMAX(967 B, ZIP)
BI-CONCA-VEL-S(88.6 kB, PDF)

Other

KBC046 RoHS Certificate(703.7 kB, PDF)

Related Products

Compatible

Description	Compatibility
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Lens Mount, Self-Centering, 0.125-1.063 in. Diameter Lenses	IMPERIAL	Learn More
Fixed Lens Mount, 1.0 in. (25.4 mm) Diameter, 8-32 Thread, A-LINE	IMPERIAL	Learn More
Precision Lens Positioner, 1.0 in., 100 TPI XYθXθY, 80 TPI Z	UNIVERSAL	Learn More
Lens Tube, 1 inch LT Series, 2 inch length	UNIVERSAL	Learn More
V-Groove Lens Holder, 0.25 to 1.25 in. Diameter Lenses	UNIVERSAL	Learn More

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