Method for anhydrous polishing of KDP crystals

Abstract

The invention provides a method for anhydrous polishing of KDP crystals. High-precision and high-efficiency polishing of a KDP crystal material is realized. The anhydrous polishing process is dividedinto rough polishing and fine polishing, and a anhydrous polishing solution comprises methyl oleate, silicon carbide/aluminum oxide mixed abrasive particles and anhydrous sodium carbonate and is divided into an anhydrous rough polishing solution and an anhydrous fine polishing solution; and the difference between the anhydrous rough polishing solution and the anhydrous fine polishing solution is embodied in the viscosity of methyl oleate, the ratio, particle size and concentration of silicon carbide/aluminum oxide mixed abrasive particles, and the particle size and concentration of anhydrous sodium carbonate. Compared with other KDP crystal polishing methods, the method for anhydrous polishing of the KDP crystals has the advantages that a polishing liquid chemical reagent used in the method is non-toxic, low in harm and environmentally friendly, the phenomenon that the KDP crystals are deliquesced in contact with water to be damaged is effectively avoided in the polishing process, andthe processing quality of the surfaces of the KDP crystals is effectively improved.

Description

technical field [0001] The invention relates to a method for anhydrous polishing of KDP crystals, belonging to the technical field of mechanical manufacturing. Background technique [0002] Potassium Dihydrogen Phosphate (KDP) crystal has excellent nonlinear optical properties and high laser damage threshold. It is currently the only large window type frequency conversion device available in large inertial confinement fusion laser systems. However, KDP crystal material has become one of the most difficult optical materials to process due to its material characteristics such as soft and brittle, sensitive to temperature changes, easy to deliquesce, and easy to crack. [0003] At present, the processing methods of KDP crystal mainly include single-point diamond flying cutting, ultra-precision grinding, magnetorheological polishing, etc. The single-point diamond flying cutting technology can effectively avoid the problem of embedding abrasive particles, but due to factors such...

AI Technical Summary

Problems solved by technology

The single-point diamond flying cutting technology can effectively avoid the problem of embedding abrasive particles, but due to factors such as machine tool vibration and geometric accuracy, it is difficult to improve the surface accuracy, and at the same time, it is easy to introduce small-scale ripples during processing, which seriously reduces the laser damage threshold; traditional precision grinding Cutting will inevitably cause embedding of abrasive particles and reduce the surface quality; magnetorheological polishing is only suitable for polishing small-sized crystals, and the abrasive particles in the magnetorheological fluid will also be embedded on the surface of the crystal element, forming a new source of laser damage. thereby affecting the performance of high power laser systems

In addition, when using these methods to process KDP crystals, the interference of adding water or moisture in the air cannot be avoided during the processing, and deliquescence phenomenon is prone to occur on the surface of KDP crystals, which greatly reduces the processing effect and even damages the crystals.

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