A nitrogen-doped diamond crystal with (111) orientation was synthesized with an NaN₃ additive in the FeNi-C system at a pressure of 6.5 GPa and a temperature of 1,310°C, using the temperature gradient growth (TGG) method. Spectroscopic properties such as the absorption spectrum and the Raman spectrum as well as the Fourier transform infrared (FTIR) spectrum were studied. FTIR spectroscopy of the C-N vibrational modes at 1,344 and 1,130 cm⁻¹ suggested a nitrogen content of 310 ppm. Its nonlinear optical (NLO) response was investigated using the Z-scan technique under the femtosecond regime. Due to the presence of nitrogen defects, the synthesized crystal performed large nonlinear absorption under both 800- and 532-nm wavelength excitations. However, intrinsic diamond only experiences nonlinear refraction under these two wavelength excitations. Its broadband NLO properties indicated that nitrogen-doped diamond crystals were suitable for the application of ultrafast optical devices.

使用温度梯度生长（TGG）方法，在 6.5 GPa 的压力和 1,310°C 的温度下，在 FeNi-C 体系中用 NaN ₃添加剂合成了具有 (111) 取向的氮掺杂金刚石晶体。研究了光谱特性，例如吸收光谱和拉曼光谱以及傅里叶变换红外 (FTIR) 光谱。CN 振动模式在 1,344 和 1,130 cm ^-1处的 FTIR 光谱建议氮含量为 310 ppm。在飞秒范围内使用 Z 扫描技术研究了其非线性光学 (NLO) 响应。由于氮缺陷的存在，合成的晶体在 800 和 532 纳米波长激发下都进行了较大的非线性吸收。然而，本征金刚石仅在这两种波长激发下才会发生非线性折射。其宽带非线性光学特性表明，掺氮金刚石晶体适用于超快光学器件的应用。