Bi-Concave Lens, Fused Silica, 25.4 mm, -75 mm EFL, Uncoated

The SBC031 Bi-Concave Lens is an uncoated, 25.4 mm diameter, UV grade fused silica bi-concave lens with an effective focal length of -75 mm. It is designed to meet the demanding requirements of laser electro-optic applications. Newport's UV grade fused silica precision bi-concave lenses are polished to tight tolerances using master test plates to ensure minimum wavefront distortion. UV grade fused silica will not fluoresce under UV light and is resistant to radiation. And for high-energy applications, the extreme purity of fused silica eliminates microscopic defect sites that could lead to laser damage.

Specifications

Technical Specs

Lens Shape
Bi-Concave
Diameter
25.4 mm
Lens Material
UV Fused Silica
Antireflection Coating
Uncoated
Surface Quality
20-10 scratch-dig
Surface Flatness
λ/2
Surface Accuracy, Irregularity
λ/4
Surface Accuracy, Power
1.5 λ
F/#
-3
Effective Focal Length (EFL)
-75 mm
Back Focal Length (BFL)
-75.85 mm
Radius of Curvature (R)
-69.241 mm
Edge Thickness (Te)
4.40 mm
Center Thickness (Tc)
2.5 mm

Principal Plane 1 (P1)
0.85 mm
Principal Plane 2 (P2)
-0.85 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
UV Fused Silica
Antireflection Coating
Uncoated
Surface Quality
20-10 scratch-dig
Surface Flatness
λ/2
Surface Accuracy, Irregularity
λ/4
Surface Accuracy, Power
1.5 λ
F/#
-3
Effective Focal Length (EFL)
-75 mm
Back Focal Length (BFL)
-75.85 mm
Radius of Curvature (R)
-69.241 mm
Edge Thickness (Te)
4.40 mm
Center Thickness (Tc)
2.5 mm

Principal Plane 1 (P1)
0.85 mm
Principal Plane 2 (P2)
-0.85 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

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