降温速率对DAST单晶生长的影响

使用籽晶法通过调整降温速率生长出高质量4-N,N-二甲胺基-4′-N′-甲基-氮杂芪对甲苯磺酸盐(DAST)晶体，研究了降温速率对DAST晶体结晶质量、光学特性及太赫兹输出特性的影响。通过核磁共振分析表征了合成原料的结构和纯度。使用X射线衍射仪对生长晶体的(001)面进行X射线摇摆曲线测试，测试结果表明在降温速率为0.1 ℃/d条件下获得的晶体质量最佳，其摇摆曲线半高宽(FWHM)为57.6″。此条件下生长的晶体在780~1 576 nm波长范围内光透过率达65%。使用差频法从DAST晶体中产生了0.1~20 THz范围内的宽频可调谐太赫兹波，在18.8 THz处得到太赫兹波最大输出能量为0.477 μJ/脉冲，对应的能量转换效率达5.31×10-5。

Abstract

High quality 4-N,N-dimethylamino-4′-N′-methyl-stilbazolium tosylate (DAST) crystals were grown by seed crystal method through adjusting cooling rate. The influence of cooling rate on crystal quality, optical properties and terahertz(THz) output characteristics of DAST crystals were explored. Additionally, the structure and purity of raw materials were characterized by applying nuclear magnetic resonance analysis method. X-ray diffraction rocking curve measurement of (001) plane of the as-grown crystals was measured by X-ray diffractometer. A best full-width at half-maximum (FWHM) narrowed as 57.6″ was obtained at the cooling rate of 0.1 ℃/d. Optical transmittance of the crystals grown under these conditions is 65% in the wavelength range of 780 nm to 1 576 nm. Moreover, using the differential frequency method wideband tunable terahertz waves in the range of 0.1 THz to 20 THz were generated from DAST crystals. At 18.8 THz, the maximum output energy of the terahertz wave is 0.477 μJ/pulse, and the corresponding energy conversion efficiency is 5.31×10-5.

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孟欢, 杨瑞霞, 王健, 王增华, 马林. 降温速率对DAST单晶生长的影响[J]. 人工晶体学报, 2021, 50(2): 253. MENG Huan, YANG Ruixia, WANG Jian, WANG Zenghua, MA Lin. Influence of Cooling Rate on the Growth of 4-N,N Dimethylamino-4′-N′-Methyl-Stilbazoliumtosylate (DAST) Single Crystal[J]. Journal of Synthetic Crystals, 2021, 50(2): 253.

降温速率对DAST单晶生长的影响

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