Method of preparing second-order non-linear optical materials, and uses thereof

Abstract

This invention discloses a method for preparing a second-order nonlinear optical crystalline material, which comprises the steps of: mixing iodoform, sulfur powder and solvent carbon bisulfide in an airtight reactor, reacting at 60-80 deg.C for 20-35 h to obtain a solution of the second-order nonlinear optical crystalline material in carbon bisulfide, adding the solution into a glass container, and placing the glass container in a constant temperature cabinet for a certain time to obtain orange bulk single crystals. The method has such advantages as short reaction time, moderate experimental conditions, high product purity and simple operation. The crystalline material can be widely applied in optical field.

Description

technical field The invention belongs to the field of inorganic chemistry, and also belongs to the field of material science and optics. It relates to a preparation method of an inorganic second-order nonlinear optical crystal material, and also relates to the application of the crystal material in terahertz waves. Background technique Nonlinear optical effects originate from the interaction between laser and medium. When the laser propagates in a medium with non-zero second-order polarizability, nonlinear optical effects such as frequency doubling, sum frequency, difference frequency, and parametric amplification will occur. Terahertz waves are usually defined as frequencies from 0.1-10 terahertz (10 12 the s -1 ) electromagnetic waves within the range. The central area of ​​research is mainly in the range of 0.3-3 terahertz. Tai is a transliteration of Tera, so terahertz electromagnetic waves are also called T-rays, which belong to the category of far-infrared and sub...

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Problems solved by technology

Since sulfur is in CS 2 The solubility in is very low, so the reaction is mainly carried out on the solid-liquid two-phase interface, and the obtained product is often mixed with a large amount of impurities, and it is difficult to obtain a product with relatively high purity; moreover, due to the habit of the substance itself, the single growth The crystal is often acicular [W.S.Fernando, J.Inorg.Nucl.Chem., 1981, 43: 1141], which seriously limits the application of the material, and there is no ideal method for growing large-sized single crystals of the material

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