Thorlabs LA1509-C-ML Mounted Plano Convex Lens

🧪 Product Overview

• The LA1509‑C‑ML is a Ø1″ (25.4 mm) plano-convex lens, made from N‑BK7, and includes an SM1‑threaded mount (SM1-40).

• It has a 100 mm focal length, corresponding to a diopter of approximately +10 D.

• The lens is coated with a broadband AR coating for the 1050–1700 nm wavelength range, delivering average reflectance less than 0.5% per surface.

• Central thickness is approximately 3.6 mm, edge thickness 2.0 mm; back focal length about 97.3 mm.

• It features optical quality: scratch‑dig 40‑20, surface flatness λ/2 (plano side) and spherical power 3λ/2 (convex side), with surface irregularity λ/4 and centration under 3 arcminutes.

• Damage threshold: ~7.5 J/cm² at 1524 nm, 10 ns pulses (Ø0.123 mm).

🧭 Suggested Applications

• Ideal for infrared beam collimation or focusing around 1050 nm to 1700 nm.

• Useful in fiber coupling, free-space optics, or imaging setups where low reflectance and threaded mounting ease integration.

• Excellent choice if you need a compact, SM-threaded optic with good optical performance in the near-IR.