The advancement of crystal growth and characterization methods allows us to investigate new substances with excellent nonlinear optical characteristics. To synthesize nonlinear optical material L-histidine hydrochloride hydrate (L-HHCLH), the gradual evaporation process was used. The produced samples were characterized by single-crystal X-ray crystallography, Fourier transform infrared (FTIR) and Raman spectroscopy, UV–visible (UV–Vis) spectroscopy, second harmonic generation (SHG) test, dielectric, and mechanical investigations. The L-HHCLH sample was crystallized in an orthorhombic structure with the P2₁2₁2₁ space group, as verified by the crystallographic data. FTIR and Raman spectroscopy were applied to examine the molecular vibrations and availability of the functional groups of the compound. The L-HHCLH is significantly transparent across the UV and visible ranges, as shown by the UV–Vis spectra measurements. The bandgap of L-HHCLH is 5.45 eV. The SHG test showed that the L-HHCLH crystals produced a significant amount of SHG output thrice that of the potassium dihydrogen phosphate (KDP) sample. The frequency dependences of the dielectric parameters were investigated in the dielectric tests. With increasing frequency, both the dielectric constant and loss dropped exponentially. The crystal hardness was determined using a microhardness test.

晶体生长和表征方法的进步使我们能够研究具有优异非线性光学特性的新物质。采用逐步蒸发法合成非线性光学材料L-组氨酸盐酸盐水合物(L-HHCLH)。通过单晶 X 射线晶体学、傅里叶变换红外 (FTIR) 和拉曼光谱、紫外可见 (UV-Vis) 光谱、二次谐波发生 (SHG) 测试、介电和机械研究对生产的样品进行了表征。晶体学数据证实，L-HHCLH 样品结晶为具有 P2 ₁ 2 ₁ 2 _{1空间群的斜方结构。}应用 FTIR 和拉曼光谱来检查分子振动和化合物官能团的可用性。如紫外-可见光谱测量所示，L-HHCLH 在紫外和可见光范围内显着透明。L-HHCLH的带隙为5.45 eV。SHG 测试表明，L-HHCLH 晶体产生的 SHG 输出量是磷酸二氢钾 (KDP) 样品的三倍。在介电测试中研究了介电参数的频率依赖性。随着频率的增加，介电常数和损耗均呈指数下降。使用显微硬度测试测定晶体硬度。