研究目的
Investigating the use of ultrashort laser pulses to create anti-counterfeiting microstructures through direct writing of computer-generated holograms, ripple rendered structure color, and defect featured photostimulated luminescence.
研究成果
The study demonstrates that ultrashort pulsed laser can effectively create anti-counterfeiting microstructures through various methods, including direct writing of holograms, creating polarization-dependent structure colors, and inducing defects for photoluminescence. These methods offer high security and are difficult to replicate.
研究不足
The technique requires precise control of laser parameters and material properties. The application is limited by the need for specific materials and the complexity of the laser setup.
1：Experimental Design and Method Selection:
Ultrashort pulsed laser micromachining was used to induce microstructures in various materials.
2：Sample Selection and Data Sources:
Four kinds of materials were used, including coated glass with metallic aluminum film, mirror-polished AISI 304 stainless steel, hydroxyl fused silica, and Mn2+-doped germanate glass.
3：List of Experimental Equipment and Materials:
A commercial regeneratively amplified 800 nm Ti: Sapphire laser, microscope with a 10 times objective lens, and a scanning electron microscope (SEM, JSM-6360LA) were used.
4：Experimental Procedures and Operational Workflow:
Laser pulses were focused onto the samples to create microstructures, and the effects were analyzed under different conditions.
5：Data Analysis Methods:
The morphologies of the modified surface were imaged with SEM, and fluorescence spectra were recorded using an instrument FLSP920.
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