Bi-Concave Lens, N-BK7, 25.4 mm Diameter, -50 mm EFL, Uncoated

The KBC043 Bi-Concave Lens is an uncoated 25.4 mm diameter N-BK7 Bi-concave lens with an effective focal length of -50 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/#
-1.9
Effective Focal Length (EFL)
-50 mm
Back Focal Length (BFL)
-50.81 mm
Radius of Curvature (R)
-52.103 mm
Edge Thickness (Te)
5.04 mm
Center Thickness (Tc)
2.5 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/#
-1.9
Effective Focal Length (EFL)
-50 mm
Back Focal Length (BFL)
-50.81 mm
Radius of Curvature (R)
-52.103 mm
Edge Thickness (Te)
5.04 mm
Center Thickness (Tc)
2.5 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

Related Products

Similar

Description	Compatibility	Price
SBC034Bi-Concave Lens, Fused Silica, 25.4 mm, -50 mm EFL, Uncoated	UNIVERSAL	$137
CKV050Cylindrical Lens, Plano-Concave, N-BK7, 50.8x19 mm, -50 mm FL, Uncoated	UNIVERSAL	$241
SPC034Plano-Concave Lens, Fused Silica, 25.4 mm, -50 mm EFL, Uncoated	UNIVERSAL	$129
KPC040Plano-Concave Lens, N-BK7, 25.4 mm Diameter, -50 mm EFL, Uncoated	UNIVERSAL	$41
CSV050Cylindrical Lens, Plano-Concave, 2 x 1 in., -50.2mm FL, FS, Uncoated	UNIVERSAL	$483

Compatible

Description	Compatibility	Price
LCM-1Lens Mount, Self-Centering, 0.125-1.063 in. Diameter Lenses	IMPERIAL	$282
VLH-1AV-Groove Lens Holder, 0.25 to 1.25 in. Diameter Lenses	UNIVERSAL	$161
AC-1AVariable Size Lens Mount, 5.0-46.2 mm, Thumbscrew Support Arms	UNIVERSAL	$58
LP-1APrecision Lens Positioner, 1.0 in., 100 TPI XYθXθY, 80 TPI Z	UNIVERSAL	$1,023
LH-1AFixed Lens Mount, 1.0 in. (25.4 mm) Diameter, 8-32 Thread, A-LINE	IMPERIAL	$20
LT10-20Lens Tube, 1 inch LT Series, 2 inch length	UNIVERSAL	$24