Three types of surface nanostructures are fabricated on tungsten by adjusting azimuth angle θ of YVO₄ birefringent crystal and laser parameters in experiment. Different surface structure morphologies are introduced and their features are investigated. The frequency characteristics of the three type laser-induced surface nanostructures are studied by the fast Fourier transformation (FFT). By varying the azimuth angle of YVO₄ crystal we can not only convert one-dimensional (1D) grating-like structures into two-dimensional (2D) surface structures, but also control the structural arrangement. Compared with traditional two-step sequential processing method, the dual orthogonal pulses generating through YVO₄ birefringent crystal can induce better periodical 1D grating-like structure. Moreover, the 2D microbumps are mainly dependent on the energy deposition effect from dual pulses. We also provide the underlying texturing mechanism of final periodic surface structures.

实验中通过调整YVO ₄双折射晶体的方位角θ和激光参数，在钨上制备了三种表面纳米结构。介绍了不同的表面结构形态并研究了它们的特征。通过快速傅里叶变换(FFT)研究了三种激光诱导表面纳米结构的频率特性。通过改变 YVO ₄晶体的方位角，我们不仅可以将一维 (1D) 光栅状结构转换为二维 (2D) 表面结构，还可以控制结构排列。与传统的两步顺序处理方法相比，通过 YVO ₄产生的双正交脉冲双折射晶体可以诱导更好的周期性一维光栅状结构。此外，二维微凸点主要依赖于双脉冲的能量沉积效应。我们还提供了最终周期性表面结构的底层纹理机制。