Femtosecond lasers can induce Laser-Induced Periodic Surface Structures (LIPSS) on the surfaces of diverse materials. However, the relatively high roughness of these structures is a major challenge. This research, centered on SiC materials and utilizing linear polarization, aimed to address this issue. The study successfully produced uniform structure and minimal roughness by controlling fluence and scanning speed. This structure was characterized by High-Quality Low Spatial Frequency LIPSS (HQ-LSFL).
In this study, novel annular microstructures on metal surfaces were fabricated with a femtosecond laser beam propagating through a microhole and irradiating on the surface of stainless steel SUS 304. The results showed that, with the use of a linearly polarized femtosecond laser beam (800 nm, 120 fs) irradiating through a microhole of diameter 80~100 μm and depth 800 μm, annular microstructures with a period of 4~8 μm were formed. Differing from the laser induced periodic surface structure (LIPSS), the formed annular microstructures are independent of laser polarization. This study speculates that this formation mechanism is due to the interference between the incident laser beam and the reflected beams from the microhole walls.
Taking advantage of the nonlinear laser-material interaction, femtosecond lasers can process transparent materials internally on micro- or nanoscales, whose applications include fabrication of micro-optical waveguides and fluidics, as well as stealth dicing of glass, ceramics, and semiconductor materials. A femtosecond Bessel beam has a long invariant transverse intensity profile up to several millimeters with a width of a few microns. Such characteristics allow the materials processing to be completed without moving the beam focusing points as in the case of the Gaussian beam. An experimental femtosecond Bessel beam microprocessing system is built up to investigate the glass internal modification characteristics, such as the width variation and aspect ratios of modification areas. The residual stresses in the irradiated area of glass after modification are also studied using micro Raman spectrum. Finally, an application to thin glass panel cutting is demonstrated by the process of internal modification and breaking. The glass panel is well cut with the chipping on the breaking edge <1 μm .
This study presents a novel non-contact method, designated as laser induced local material transfer (LILMT), for
patterning carbon nanotube (CNT) emitters on the cathode of a CNT backlight unit (CNT-BLU) under the environment
of the atmosphere and at room temperature. The LILMT method makes possible the manufacturing of large-scale
substrates with a higher resolution than that which can be attained using familiar screen-printing methods. The
preliminary results obtained for the field emissions of square-type and line-type CNT emitters confirm the effectiveness
of the proposed patterning method.
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