Patassium dihydrogen phosphate crystal slaking and finishing method

Abstract

The invention discloses a deliquescence polishing method for a potassium dihydrogen phosphate (KDP) crystal, which relates to the polishing method for crystals and solves problems that when an existing ultra-precision machining method is adopted to process the KDP crystal, small size ripples and embedment of particles probably occur on the surface of the KDP crystal, the surface of the KDP crystal is difficult to be washed and the existing ultra-precision machining method is low in processing efficiency and high in cost. The deliquescence polishing method of the invention is that 1. a KDP crystal polishing device is adopted; 2. the surfaces to be polished of the stock of a KDP crystal (4) are pretreated; 3. certain pressure is imposed on a sample carrying tray (5) longitudinally; 4. the surfaces of the KDP crystal treated by the step 2 are deliquesced by adopting deliquescence polishing solution or water vapor; 5. a control switch of the sample carrying tray (5) and a control switch of a polishing disk (3) are started and then deliquescence polishing is carried out on the surfaces of the KDP crystal treated by the step 2. The deliquescence polishing method of the invention is novel, unique, simple and has the advantages of high processing efficiency and low cost, no small size ripples on the surfaces of the KDP crystal processed by the method, no embedment of particles; the surfaces of the KDP crystal processed by the method are easily washed and the surface roughness can reach 1nm to 8nm.

Description

technical field [0001] The present invention relates to a crystal polishing method. Background technique [0002] KDP crystal is potassium dihydrogen phosphate (KH 2 PO 4 ) crystal for short, is a class of excellent electro-optical nonlinear optical materials developed in the 1940s, and is widely used in high-tech fields such as laser frequency conversion, electro-optic modulation, and optical fast switching. In laser inertial confinement fusion, KDP Crystals are used in optical doubler converters and electro-optical switches. However, KDP crystal has the characteristics of soft quality, easy deliquescence, high brittleness, and sensitivity to temperature changes. These characteristics are very unfavorable to its processing. Large-scale high-precision optical KDP crystal parts are currently recognized as one of the most difficult optical parts to process. In order to obtain KDP crystal parts with large size and high optical quality, many scholars at home and abroad have c...

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Problems solved by technology

[0003] In order to solve the problem that small-scale ripples will be produced when the KDP crystal is processed by the existing single-point diamond cutting technology, the present invention uses the ultra-precision grinding technology to process the KDP crystal. Abrasive grains are difficult to remove from the KDP crystal surface, and the magnetorheological polishing liquid remaining on the polishing surface is difficult to clean when the KDP crystal is processed by magnetorheological polishing technology, and the problems of low processing efficiency and high cost provide a dihydrogen phosphate Potassium crystal deliquescent polishing method, the concrete technical scheme that solves the above-mentioned problem is as follows:

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