ZPAN：一种用于高强度太赫兹产生的有机非线性光学晶体
ZPAN: An Organic Nonlinear Optical Crystal for High Intensity THz Generation
AI总结：
研究ZPAN有机非线性光学晶体，通过优化合成与生长方案，测定其在不同条件下的太赫兹产生特性，发现能产生特定光谱和电场强度的太赫兹光，且(010)面利于高功率激光系统，为太赫兹产生提供新晶体材料。
AI中文摘要：
我们报告了有机非线性光学晶体ZPAN（(Z)-1-(((4-苯胺基)苯胺基)亚甲基)萘-2(1H)-酮）的优化合成、晶体生长方案以及结构、光学和太赫兹产生特性。通过从丙酮基溶剂系统中缓慢蒸发可最可靠地实现ZPAN的非中心对称堆积，生成以(010)为主面、[001]为极轴和晶体生长伸长方向的长矩形棱柱。[001]是通过光整流产生太赫兹光最有效的泵浦偏振方向。在不同近红外辐照波长、晶体厚度和泵浦功率下测定了所开发的ZPAN晶体的太赫兹产生特性，结果表明ZPAN能产生峰峰值近1 MV/cm、光谱从0.5 - 3.4 THz的平滑光谱。计算的二阶非线性光学系数表明(100)和(010)面理论上都能产生太赫兹，不过(010)始终是主要生长面。该面尺寸大（7 cm×1 cm）使得可随孔径大小缩放激光功率，用于极高功率激光系统。
英文摘要：
We report an optimized synthesis and crystal growth protocol as well as structural, optical, and terahertz (THz) generation characteristics of the organic nonlinear optical crystal ZPAN ((Z)-1-(((4-Phenylamino)phenylamino)methylene)naphthalen-2(1H)-one). Noncentrosymmetric packing of ZPAN is most reliably achieved by slow evaporation from an acetone-based solvent system, producing long rectangular prisms (7 cm \times 1 cm \times 0.2 cm) with (010) as the main face and [001] as both the polar axis and the direction of elongated crystal growth. [001] is thus the most effective pump polarization direction for generating THz light via optical rectification. The THz generation characteristics of the developed ZPAN crystals are determined at different near-infrared irradiation wavelengths, crystal thicknesses, and pump powers, revealing that ZPAN can generate a peak-to-peak electric field of near 1 MV/cm with a smooth spectrum from 0.5-3.4 THz. Calculated second order nonlinear optical coefficients indicate that both the (100) and (010) faces are theoretically capable of THz generation, though (010) is consistently the dominant growth face. The large size of this face (7 cm \times 1 cm) makes it possible to scale laser power with aperture size, for use in extremely high-power laser systems.
