太赫兹科学与电子信息学报, 2020, 18 (4): 570, 网络出版: 2020-12-25
有机非线性光学晶体 DAST的太赫兹发射性能
Terahertz emission properties of organic nonlinear optical crystal DAST
摘要
研究了 DAST晶体的有效二阶非线性系数和太赫兹发射性能。实验以 DAST-甲醇溶液的亚稳区范围为依据, 采用溶液降温法进行 DAST的生长。实验发现, 降温速率越快, 晶体的生长速度越快, 但晶体易发生多晶转变;在晶体生长后期, 采用较慢的降温速率, 有利于晶体厚度的增加。经磨抛后的晶体表面粗糙度能够达到光学测试等级(微米级)要求。经测试, DAST晶片有效二阶非线性系数平均值为 16.58 pm/V, 实现了频率范围 0.84~10 THz的太赫兹波发射, 并在
Abstract
:The effective second-order nonlinearity and terahertz emission properties of DAST crystal are mainly studied. Based on the metastable region of DAST-methanol solution, the growth experiment of DAST is carried out by solution cooling methods. It is found that the higher the cooling rate, the faster the crystal growth rate, but the polycrystalline is easy to occur. In the later stage of crystal growth, the lower cooling rate is beneficial to the increase of crystal thickness. After grinding, the surface roughness of the polished crystal could meet the optical test level(micron level) requirement. The average effective second order non-linear coefficient of DAST chip is 16.58 pm/V. Terahertz emission in the frequency range of 0.84-10 THz is realized, and the maximum emission intensity is at 2.72 THz.
李宝珠, 武聪, 庞子博. 有机非线性光学晶体 DAST的太赫兹发射性能[J]. 太赫兹科学与电子信息学报, 2020, 18(4): 570. LI Baozhu, WU Cong, PANG Zibo. Terahertz emission properties of organic nonlinear optical crystal DAST[J]. Journal of terahertz science and electronic information technology, 2020, 18(4): 570.