研究目的
To address the challenge of realizing ultralow re?ectance on a metal surface due to the signi?cant optical impedance mismatch between a metal surface and free space by proposing a two-step strategy for constructing antire?ective structures on a Ti-6Al-4V (TC4) surface using nanosecond and femtosecond pulsed lasers in combination.
研究成果
The two-step strategy using femtosecond and nanosecond lasers successfully realized ultralow broadband interface re?ection on TC4 surfaces. The morphological characterization proved that deep air holes and nanostructures play a predominant role in antire?ection, achieving an average re?ectance of 3.1% over the wavelength range from 250 nm to 2250 nm.
研究不足
The study focuses on the fabrication of antire?ective structures on a Ti-6Al-4V (TC4) surface, and the applicability to other metals or materials is not explored. The process parameters are optimized for the specific lasers and materials used, which may limit generalization.
1：Experimental Design and Method Selection:
A two-step processing technique was designed to induce hierarchical micro- and nanostructures on the TC4 surface using nanosecond and femtosecond pulsed lasers.
2：Sample Selection and Data Sources:
A Ti-6Al-4V (TC4) titanium alloy sample was used.
3：List of Experimental Equipment and Materials:
Nanosecond laser (BX-2-G, Edgewave, Germany), femtosecond laser (Pharos, Light Conversion, Lithuania), scanning galvanometer (GO5, JCZ Technology, China), three-dimensional mobile platform (ANT, Aerotech, USA), field emission scanning electron microscopy (SEM, JSM-7500F, Japan), spectrophotometer (Lambda 1050, PerkinElmer, USA).
4：Experimental Procedures and Operational Workflow:
Micro-scale structures were first fabricated using the nanosecond laser, followed by femtosecond laser treatment to induce nanoscale structures and air holes.
5：Data Analysis Methods:
The sample surfaces were characterized using SEM, and the hemispherical re?ectance was measured using a spectrophotometer.
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