Multi-laser composite precision processing method for free-form surface optical lens

Abstract

The invention relates to the technical field of optical material processing equipment, in particular to a multi-laser composite precision processing method for a free-form surface optical lens. The method comprises the following steps of: 1, determining the positions and the number of prefabricated points; 2, preparing curved surface prefabricated points, adjusting and focusing ultrafast laser focal points to the positions of the prefabricated points through a focusing system, and preparing the prefabricated points in the optical material one by one through ultrafast lasers; 3, carrying out laser cutting: shaping the fiber laser by using a continuous fiber laser separation device, then enabling the fiber laser to enter the optical material, enabling the prefabricated points to absorb laserenergy to generate a high-temperature area at the prefabricated points, and then enabling the fiber laser to move to enable the high-temperature area to move along with the laser; and 4, allowing CO2laser to act on a cutting separation surface. According to the invention, laser three-dimensional cutting is completed, curved surface structures needed by optical components such as optical lenses are directly generated, and aftertreatment is conducted to generate the optical surface with the nanometer-level roughness.

Description

technical field [0001] The invention relates to the technical field of optical material processing equipment, in particular to a multi-laser composite precision processing method for a free-form surface optical lens. Background technique [0002] Optical lenses are composed of optical materials, such as optical glass, quartz, sapphire, optical crystals and other transparent optical materials with a certain refractive index. Freeform surface lenses are composed of optical materials with special three-dimensional structures, such as microlens arrays, freeform surface prisms, Fresnel lenses, toric lenses, fly eye lenses, etc. Applications. [0003] At present, the preparation methods of optical lenses, especially the preparation of quartz material lenses, are still carried out by traditional mechanical grinding and polishing methods, such as breaking apart after scribing with a diamond tool, sawing, wire sawing, etc. There are a series of problems such as slow cutting speed, ...

AI Technical Summary

Problems solved by technology

However, the traditional laser cutting separation method can only cut and separate planar materials, and the cutting and separating surface is often a regular planar structure, which cannot cut and separate the free-form surface structure required for optical materials, and it is difficult to achieve high-quality optical materials. Cut and separate

At the same time, the surface roughness of the traditional laser cutting method is often high, and its surface roughness is often still on the order of microns when the cutting quality is good

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