An optical device for polishing metal surfaces

Abstract

In the optical device used for metal surface polishing provided by the present invention, the laser beam emitted by the femtosecond laser source is focused on the three-dimensional moving laser beam through the yttrium vanadate birefringent crystal, the attenuation plate and the focusing objective lens in sequence. The metal surface on the platform, and the metal surface is laser polished to obtain a smooth polished surface. The optical device for metal surface polishing provided by the present invention realizes the polishing of the metal surface by controlling the relevant femtosecond laser processing parameters. Polishing, compared with the existing mechanical polishing methods, it can achieve a large area of ​​rapid polishing and micro-area polishing, without the need for auxiliary materials such as sandpaper, abrasive paste, chemical etchant; and the whole process is simple and easy to operate, and the thermal effect is negligible, can be Realize high-precision polishing; at the same time, due to the use of non-contact processing, it can effectively avoid stress damage and contamination on the surface of metal tungsten samples.

Description

technical field [0001] The invention relates to the technical field of optical processing, in particular to an optical device for polishing metal surfaces. Background technique [0002] As a refractory metal with high strength and high hardness, metal tungsten has good chemical stability and is not easy to be corroded. It has been widely used in electronics, light source, machinery industry and other departments. However, due to the high hardness of metal tungsten, when the traditional mechanical grinding and polishing method is used, the polishing cycle is long, the polishing accuracy is poor, the efficiency is low, and a variety of abrasives need to be added during the polishing process, so the price of polished metal tungsten products is generally higher. High, of which the polishing cost can account for more than half, while other more mature polishing methods, such as ion beam polishing, chemical polishing, electrolytic polishing, etc., usually require a strict process...

AI Technical Summary

Problems solved by technology

[0004] However, when long-pulse lasers are used to polish metal materials such as tungsten, more thermal effects will be generated on the surface of the material, resulting in a large temperature gradient of the material, which will generate greater thermal stress and pull the surface of the material to form cracks. This stress damage leads to polishing. The level of precision achieved is not high, and the surface roughness is usually on the order of microns

In addition, its polishing effect on metal is also affected by many factors, including laser wavelength, beam incident angle, laser scanning speed, scanning mode, etc., and how to accurately control various parameters to form a suitable thickness in a fixed area on the metal surface The molten metal layer still faces great challenges

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