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主要介绍DAST晶体的基本结构和物理性能参数,几种不同生长方法及基于有机DAST晶体通过光学差频法产生THz波.重点研究了基于DAST晶体利用光学差频法产生太赫兹(THz)波过程中,泵浦光源的双波长调谐范围及光束质量对THz调谐范围及转换效率的影响,及其利用光整流法产生THz波的过程中,泵浦光(飞秒激光的波长、脉冲宽度和能量)对THz脉冲输出能量和转换效率的影响.综合分析影响THz辐射性能的因素及其获得大尺寸高质量晶体的主要挑战.本课题组在系统分析利用自发成核、斜板、籽晶和双温区法生长晶体优缺点的基础上,利用自发成核结合顶部籽晶法生长出高质量、尺寸为25 mm×22 mm×2 mm的晶体.下一步计划从晶体生长和泵浦光束的质量两方面改善THz输出能量及光-THz波转换效率.
The basic structural and physical properties of DAST crystals are introduced, and several different growth methods and THz waves generated by optical difference frequency method based on organic DAST crystals are mainly introduced. The THz wave process based on DAST crystal is mainly studied. , The influence of the pump wavelength and pulse quality on the tuning range and the conversion efficiency of the THz and the THz wave generated by the optical rectification method are analyzed. The relationship between the pump light (the wavelength, the pulse width and the energy of the femtosecond laser) ) On the energy and conversion efficiency of THz pulse output.A comprehensive analysis of the factors affecting the THz radiation performance and the main challenges of obtaining large-size and high-quality crystals are provided.Our group systematically analyzes and analyzes the effects of spontaneous nucleation, sloping plates, Based on the advantages and disadvantages of temperature grown crystal, a high quality 25 mm × 22 mm × 2 mm crystal was grown by spontaneous nucleation combined with a top-seed method.The next step was to study the crystal growth and the quality of the pump beam Improve THz output energy and optical-THz wave conversion efficiency in two aspects.