光子学报, 2016, 45 (8): 0832001, 网络出版: 2016-09-12
线性、径向和环向偏振飞秒激光诱导非晶合金周期性表面结构
Linearly, Radially and Azimuthally Polarized Femtosecond Laser Induced Periodic Surface Structures on Amorphous Alloy
超快光学 飞秒激光 非晶合金 有限差分时域法 空间光调制器 Laser induced periodic surface structures Ultrafast laser processing Amorphous metal Finite-Difference Time-Domain (FDTD) Spatial Light Modulator (SLM)
摘要
研究在复杂偏振条件下, 飞秒激光诱导非晶合金Zr44Ti11Cu10Ni10Be25(at%)表面周期性结构的形成机理.实验采用波长800 nm、脉宽120 fs的超短脉冲激光, 分别在线性、径向、环向偏振条件下,诱导非晶合金表面生成复杂的周期性表面结构.表面结构由周期为652～723 nm的低频条纹和周期为1 304～1 765 nm的微型条纹组成.通过有限差分时域法仿真分析, 发现微型条纹由粗糙表面引起的定向调制的表面散射电磁波与入射激光干涉形成.仿真结果与实验结果一致, 验证了微型条纹形成机理的有效性.
Abstract
The formation mechanism of Laser Induced Periodic Surface Structures (LIPSS) on the amorphous alloy Zr44Ti11Cu10Ni10Be25(at%) was investigated. In experiment, LIPSS on the amorphous alloy were produced by ultrashort laser pulses of 120 fs duration at 800 nm wavelength in three types of laser polarizations (linear, radial and azimuthal polarization). These LIPSS are comprised of Low-Spatial-Frequency LIPSS (LSFL) with the periodicity of 652～723 nm and macro-ripples with the periodicity of 1 304～1 765 nm. By Finite-Difference Time-Domain (FDTD) simulations, formation mechanism of macro-ripples can be explained by the interference between laser and modulated scattered electromagnetic wave induced by rough surface. In the condition of three types of laser polarizations (linear, radial and azimuthal polarization), FDTD simulation results agree with experimental results, proving the effectiveness of the macro-ripple formation mechanism.
李晨, 程光华. 线性、径向和环向偏振飞秒激光诱导非晶合金周期性表面结构[J]. 光子学报, 2016, 45(8): 0832001. LI Chen, CHENG Guang-hua. Linearly, Radially and Azimuthally Polarized Femtosecond Laser Induced Periodic Surface Structures on Amorphous Alloy[J]. ACTA PHOTONICA SINICA, 2016, 45(8): 0832001.
PDF全文
