Large Plano-Concave Cylindrical Lenses

Large-aperture plano-concave cylindrical lenses for one-axis beam expansion.

Product Overview

Large plano-concave cylindrical lenses have one flat surface and one concave cylindrical surface over a specified aperture.

They provide negative power in one direction to increase divergence or expand a beam axis when paired with suitable positive optics.

Material, aperture, center thickness, cylindrical radii, axis orientation and coating requirements can be specified to your drawings, subject to manufacturing review.

Applications

Laser Diode Beam Expansion: Negative cylindrical elements paired with positive cylindrical lenses to enlarge one beam axis and reshape elliptical output.
Machine Vision & Alignment: Spreading a laser beam in one direction to produce fan-shaped illumination for alignment or line projection.
Anamorphic Imaging Instruments: Negative cylindrical power within lens groups that modify image scale in one direction.
Industrial Optical Measurement: Adjusting one-axis divergence to match illumination width to the measurement region.
Laboratory Beam-Shaping Systems: Controlling the convergence of larger-aperture beams independently in one transverse direction.

Typical Specifications

Parameter	Standard Grade	Precision Grade
Materials	N-BK7, Quartz, CaF₂, MgF₂, ZnSe, ZnS, and other optical glass upon request	N-BK7, Quartz, CaF₂, MgF₂, ZnSe, ZnS, and other optical glass upon request
Diameter	5–300 mm	5–300 mm
Diameter Tolerance	+0 / −0.10 mm	+0 / −0.02 mm
Center Thickness Tolerance	±0.10 mm	±0.02 mm
Radius of Curvature Tolerance	±0.5%–±1%	±0.1%
Surface Figure	λ/4 @ 632.8 nm	λ/10 @ 632.8 nm
Surface Quality (Scratch–Dig)	40–20	20–10 / 10–5
Surface Roughness (Ra)	≤1.0 nm	≤0.3 nm
Centration Error	<3′	<30″
Angle / Wedge	1′–5′	1″–10″
Coating	AR / HR, etc., to customer requirements	AR / HR, etc., to customer requirements

Other specifications, materials, and coatings are available upon request.