Organic nonlinear optical crystal material DOBT and preparation method thereof

Abstract

The invention belongs to the technical field of functional materials and preparation thereof, and relates to an organic nonlinear optical crystal material DOBT and a preparation method thereof. The method comprises the following steps: firstly, preparing methyl p-toluenesulfonate and 2-methylbenzothiazole solutions with equal molar weight by taking methanol as a solvent, and then mixing the two prepared solutions for reaction; adding 3,4-dimethoxybenzaldehyde with equal molar weight, and adding a catalyst for reaction to obtain a crystal growth raw material; and then carrying out DOBT crystal growth by adopting a spontaneous nucleation method. The obtained crystal belongs to a nonlinear optical crystal, and molecules with benzothiazole rings are contained in the structure, so that the non-centrosymmetric degree of the crystal is further improved, and the generation of a relatively large second-order nonlinear optical coefficient is facilitated; the second-order nonlinear optical property of the material is about 6 times that of KDP, and the material also has good electro-optical performance. The preparation method of the crystal is simple and convenient, the nonlinear performance is better, and the crystal has a higher application prospect.

Description

Technical field: [0001] The invention belongs to the technical field of functional materials and their preparation, and relates to an organic nonlinear crystal material DOBT and a preparation method thereof. Background technique: [0002] In recent years, with the continuous development of THz technology, it has changed from basic research to applied research, which has set off a wave of THz research in the world. At present, the materials used to generate and detect THz waves are mainly inorganic nonlinear and organic nonlinear optical materials. Compared with inorganic materials, organic nonlinear optical materials have higher nonlinear optical coefficients, faster response speeds, and are easy to modify optical damage. The threshold and molecular variability are strong, and there are broad application prospects in laser frequency doubling, integration and communication. Among them, DAST crystal is the most representative of organic nonlinear optical materials. As the mos...

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Problems solved by technology

Among them, DAST crystal is the most representative of organic nonlinear optical materials. As the most effective THz radiation source, it is of great significance to promote the development of THz technology, but the process of growing high-quality, large-size DAST crystal is not yet mature; stable Poor performance, easy to deliquescence, no THz performance after deliquescence; in addition, in the process of light-THz wave conversion, there is a strong absorption peak at 1.1THz, that is, continuous tunable THz waves cannot be generated near 1THz

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