Method for preparing lithium ammonium sulfate nonlinear optical crystals and application thereof

Abstract

The invention relates to a method for preparing lithium ammonium sulfate nonlinear optical crystals and application thereof. The lithium ammonium sulfate nonlinear optical crystals are prepared by the aid of the room-temperature solution method. A molecular formula of the lithium ammonium sulfate nonlinear optical crystals is Li(NH4)SO4, the molecular weights of the lithium ammonium sulfate nonlinear optical crystals are 121.035, and the lithium ammonium sulfate nonlinear optical crystals belong to orthorhombic crystal systems and comprise space groups Pna2<1>; crystal cell parameters a are equal to 8.753 (3) , crystal cell parameters b are equal to 9.102(3) , crystal cell parameters c are equal to 5.2647 (16) , and crystal cell parameters V are equal to 419.4 (2) <3>. The method and the application have the advantages that nonlinear optical effects of the lithium ammonium sulfate nonlinear optical crystals are approximately 0.6 times nonlinear optical effects of KDP (potassium dihydrogen phosphate, KH2PO4), the optical band gap widths of the lithium ammonium sulfate nonlinear optical crystals are 7.52 eV, the ultraviolet cutoff of the lithium ammonium sulfate nonlinear optical crystals is 165 nm, and the lithium ammonium sulfate nonlinear optical crystals are high in transmittance for visible light and near infrared wave bands; the method is easy and convenient to implement, low in cost, little in pollution and short in growth cycle, and raw materials for the lithium ammonium sulfate nonlinear optical crystals are low in toxicity; the large-size lithium ammonium sulfate nonlinear optical crystals prepared by the aid of the method are free of slaking in air and stable in physical and chemical property, and cutting and polishing machining can be facilitated; the large-size and high-quality transparent lithium ammonium sulfate nonlinear optical crystals can be prepared by means of growing and are suitable for manufacturing nonlinear optical devices.

Description

technical field [0001] The invention relates to a preparation method and application of a large-size lithium ammonium sulfate nonlinear optical crystal. The method adopts an aqueous solution method to prepare the crystal, and uses the lithium ammonium sulfate nonlinear optical crystal to manufacture a nonlinear optical device. Background technique [0002] Nonlinear optics is a branch of optics that specializes in the study of the interaction mechanism, phenomena and applications of strongly coherent light and matter. The physical essence of the interaction between strong coherent light and matter is the same as that of traditional weak light and matter. Both can be understood as the polarization process of the medium caused by the light wave and electric field. The only difference is the degree of polarization. Weak light can only make the medium Linear polarization, while strong laser can cause nonlinear polarization of the medium. This series of phenomena caused by nonli...

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Problems solved by technology

Although the growth technology of these crystals has become increasingly mature, there are deficiencies and defects such as crystals are easy to deliquescence, the growth cycle is long, the raw materials used are highly toxic, and the habit of layered growth is serious.

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