F-[theta] optical lens used for dual-wavelength laser processing

The invention relates to an F-[theta] optical lens used for dual-wavelength laser processing, and belongs to the technical field of optical lenses. Dual-wavelength laser are lasers with a wavelength from 500nm-550nm and lasers with a wavelength from 1000nm-1100nm. The F-[theta] optical lens comprises a first lens, a second lens and a third lens which are arranged in sequence along the light transmission direction, wherein the first lens is a concave-convex negative lens, the second lens is a double-convex positive lens, the third lens is a concave-convex negative lens, light incident surfaces and light emergent surfaces of the first lens and the third lens are respectively bent to the light transmission direction. The optical lens provided by the invention is capable of solving the problems in the prior art that a processing structure is deformation-prone in a laser processing process and the laser utilization rate is low, and dual-wavelength laser processing requirements are met.