Laser absorptivity on wavy molten metal surfaces: Categorization of different metals and wavelengths
Laser absorptivity on wavy molten metal surfaces: Categorization of different metals and wavelengths
复制标题
波状熔融金属表面的激光吸收率：不同金属和波长的分类
DOI：
10.2351/1.4833936
复制
发表时间：
2014
影响因子：
2.1
通讯作者：
A. Kaplan
中科院分区：
文献类型：
--
作者：
A. Kaplan
在激光焊接、切割或钻孔过程中，激光束在掠入射时与加工前沿相互作用的吸收率取决于待加工的金属和激光波长。平滑处理前沿上的吸收率均匀地由相应菲涅尔曲线的角度相关操作范围控制。相比之下，波状处理前沿强烈调节整个表面的吸收率。计算出的吸收率调制针对五种不同的金属和四种激光波长。基于各自的光学常数和菲涅尔曲线的讨论导致了吸收行为的分类，主要分为低电导率和高电导率金属以及短激光波长和 10.6μm 长激光波长。分为六类。特别是，即使对于波状加工前沿，高导电金属对于短激光波长仍保持高反射性。总吸收率较高的例外是 532nm 的 Cu 和...
The absorptivity of a laser beam interacting at grazing incidence with the processing front during laser welding, cutting, or drilling depends on the metal to be processed and on the laser wavelength. The absorptivity on a smooth processing front is homogeneously governed by the angle-dependent operating range of the corresponding Fresnel-curve. In contrast, a wavy processing front strongly modulates the absorptivity across the surface. The calculated absorptivity modulation is presented for five different metals and four laser wavelengths. A discussion based on the respective optical constants and Fresnel-curves leads to a categorization of the absorption behavior, mainly dividing into low and high electrical conductivity metals as well as into short and 10.6 μm long laser wavelength. Six categories are distinguished. In particular, highly conductive metals remain highly reflective for short laser wavelength, even for a wavy processing front. Exceptions of higher overall absorptance are Cu for 532 nm and...