Beam Focusing and Shaping High Transmission Cylindrical Lenses

Key Features

Cylindrical lenses are optical parts with curvature in only one direction (cylindrical direction) and a flat surface in the other. They’re all about “controlling light in one dimension”—here’s what makes them stand out:

• Focuses/diverges light in one direction only: They only focus or spread light along the curved direction (e.g., focus horizontally, stay parallel vertically). Great for scenes where you just need to adjust light in one dimension—something spherical lenses can’t do.
• Fixes line-shaped light spots for better precision: Turns oval laser beams into regular line spots, or focuses spread-out line light into thin beams. Makes light energy more concentrated—like creating thinner lines for laser marking.
• Fits many scenes, easy to install: Comes in plano-convex, plano-concave, biconvex, biconcave types. Sizes range from 3mm to 100mm, so they fit into small devices or large laser machines.
• Low loss, durable: Made of BK7 glass, fused silica, etc. Transmittance for visible light is ≥92%. For high-temp scenes (like laser processing), fused silica versions work best—they resist laser damage and last longer.

Common Uses (Real Scenes You’ll Recognize)

1. Laser Processing
   • Laser marking/engraving: Turns round laser beams into thin line spots, carving finer text or patterns on metal/plastic (line width down to 0.01mm).
   • Laser welding: Focuses laser onto long, narrow weld seams—keeps energy on the weld and stops nearby materials from overheating.
2. Industrial Inspection & Machine Vision
   • Part size measurement: Focuses light into thin line spots, shining on part edges. Cameras catch the spot position to measure length/diameter precisely (error ≤0.001mm).
   • Barcode/QR code scanning: Fixes spread-out scanning light into even line light, quickly reading barcodes on packages.
3. Medical & Scientific Research
   • Medical laser treatment: Like removing spots in dermatology, cylindrical lenses turn the laser into long, narrow spots, covering spots without harming normal skin.
   • Spectral analysis: Focuses spread-out spectral lines into thin beams, helping spectrometers catch clearer signals for more accurate material testing.

How to Choose (3 Simple Steps)

1. First, decide “what you need it for”: Focus or diverge light?
   • Need to focus light (e.g., laser marking): Pick plano-convex cylindrical lenses.
   • Need to spread light (e.g., widen scanning range): Pick plano-concave ones.
   • High-precision scenes (e.g., medical lasers): Go for fused silica—resists high temps and laser damage.
2. Next, check “size”: Will it fit?
   • Measure the installation space in your device, leave a 0.5-1mm gap (e.g., 5mm space = choose ≤4.5mm diameter).
   • Small devices: 5-10mm sizes. Large laser machines: 20-50mm sizes.
3. Finally, check “specs”: Will it work?
   • High laser power (e.g., ≥10W): Choose ones with a laser damage threshold ≥20J/cm².
   • UV/high-temp scenes: Must pick fused silica—regular glass breaks under UV.
   • Need extra thin lines (e.g., ≤0.01mm): Choose high-precision ones with surface roughness Ra≤0.5nm.