Bi-Concave Lens, N-BK7, 25.4 mm Diameter, -200 mm EFL, 1000-1550nm

The KBC031AR.18 Bi-Concave Lens is a 1000 to 1550 nm anti-reflection coated, 25.4 mm diameter, N-BK7 Bi-concave lens with an effective focal length of -200 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
1000-1550 nm
Coating Type
IR Multilayer
Coating Code
AR.18
Damage Threshold
7.5 J/cm², 10 ns pulses, 20 Hz at 1064 nm
Surface Quality
40-20 scratch-dig
Surface Accuracy, Irregularity
λ/4
Surface Accuracy, Power
1.5 λ
F/#
-7.8
Effective Focal Length (EFL)
-200 mm
Back Focal Length (BFL)
-200.82 mm

Edge Thickness (Te)
3.13 mm
Center Thickness (Tc)
2.5 mm
Principal Plane 1 (P1)
0.82 mm
Principal Plane 2 (P2)
-0.82 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
1000-1550 nm
Coating Type
IR Multilayer
Coating Code
AR.18
Damage Threshold
7.5 J/cm², 10 ns pulses, 20 Hz at 1064 nm
Surface Quality
40-20 scratch-dig
Surface Accuracy, Irregularity
λ/4
Surface Accuracy, Power
1.5 λ
F/#
-7.8
Effective Focal Length (EFL)
-200 mm
Back Focal Length (BFL)
-200.82 mm

Edge Thickness (Te)
3.13 mm
Center Thickness (Tc)
2.5 mm
Principal Plane 1 (P1)
0.82 mm
Principal Plane 2 (P2)
-0.82 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

BI-CONCA-VEL-S(88.6 kB, PDF)
KBC031AR.18 Zemax File(5.3 kB, ZMX)

Other

KBC031AR.18 RoHS Certificate(708.5 kB, PDF)
AR.18 Raw Data.xlsx(113.4 kB, XLSX)

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