Cylindrical Lens has optical power in only one direction, capable of compressing a point light source into a line or providing no magnification in the other direction. It is widely used in applications such as laser line focusing, beam shaping, grating coupling, and astigmatism correction.

1. Optical Characteristics
   ? Uniaxial Focusing: Possesses refractive power along the axial (curved) direction; flat or parallel in the perpendicular direction, producing a "line" output instead of a "point."
   ? Common Specifications: Focal length 5 mm – 1000 mm; effective aperture 2 mm × 2 mm – 50 mm × 50 mm.
   ? Surface Accuracy: λ/4@632.8 nm; surface roughness ≤ 10 ?, suitable for visible to near-infrared laser systems.
   ? Coatings: Broadband anti-reflection (400-700 nm), single-wavelength anti-reflection at 808 nm, 1064 nm, 1550 nm, or high transmission coating for 10.6 μm CO? lasers.

2. Manufacturing Shapes
   ? Plano-Convex Cylindrical: Most common, easy to manufacture, low cost.
   ? Plano-Concave Cylindrical: Used to expand line width or compensate for astigmatism.
   ? Biconvex/Biconcave Cylindrical: Symmetrical structure, reduces spherical aberration.
   ? Aspheric Cylindrical: CNC grinding or molding, further reduces aberrations, suitable for high-power fiber laser collimation.
   ? Custom shapes available: Rectangular, circular, D-shaped, stepped holes, metallized edges.

3. Common Materials
   ? N-BK7 / H-K9L: Low absorption in visible to near-infrared range, cost-effective.
   ? UVFS: High transmission in ultraviolet (193-400 nm), suitable for excimer laser beam shaping.
   ? CaF?, MgF?: Broadband transmission from deep ultraviolet to mid-infrared, low dispersion.
   ? ZnSe, Ge: Mid to far-infrared (2-14 μm) laser focusing.