Growth method of organic nonlinear optical crystal

Abstract

The invention belongs to the technical field of crystal growth and relates to a growth method of organic nonlinear optical crystal. The growth method comprises the following steps of: firstly, drying a DAST (sulfur trifluoride) crystal growth raw material, dissolving the DAST crystal growth raw material in an absolute methanol solution to prepare a DAST methanol solution; then, heating and filtering the DAST methanol solution, and transferring the DAST methanol solution into a wild-mouth bottle; putting a polyfluortetraethylene plate in the wild-mouth bottle, and sealing the wild-mouth bottle; putting the wild-mouth bottle in a sealed water bath heating device to be thermally insulated, and cooling the wild-mouth bottle until the DAST crystal stops growing, taking out the crystal DAST crystal, namely, obtaining the DAST crystal with large surface area and thickness. The growth method is simple, the principle is scientific, the growth environmental is friendly, the cost is low, and the grown DAST crystal is large in geometric dimension, high in transmittance and convenient to be further processed and utilized.

Description

Technical field: [0001] The invention belongs to the technical field of crystal growth, and relates to a process for growing large-sized crystals of 4-(4-dimethylaminostyryl)picoline p-toluenesulfonate (DAST), in particular to an organic nonlinear optical crystal growth method. Background technique: [0002] Terahertz (THz, 1THz=10 12 Hz) waves refer to electromagnetic waves with a frequency in the range of 0.1-10THz, and their bands are located between millimeter waves and far-infrared light (0.03mm-3mm) in the electromagnetic spectrum. , THz optoelectronic technology is considered to be a major scientific issue in the field of international electronics and information, and it is a bridge connecting macroscopic electronics and microscopic wavelength science. Showing unique properties, THz technology has great advantages in the reconnaissance, identification, blinding and confrontation of space moving targets. It has become a favorable tool for wireless communication and a...

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Problems solved by technology

[0003] At present, the growth methods of DAST crystals include inclined plate method, seed crystal method and double segment method. These methods can increase the growth size of crystals and improve the quality of crystals to a certain extent, but the size of DAST crystals is still not ideal. Its thickness is generally thin, which affects the further processing and utilization of crystals, and limits the generation and detection of terahertz radiation waves.

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