- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Controllable spatial array of optical needles with independent axial intensity distributions for laser microprocessing
摘要： Due to their high length to width ratio nondiffracting beams are usually perceived as “optical needles”. We construct an “optical needle” with an arbitrary longitudinal intensity distribution and change the spatial position of it in the focal region of a lens. Next, we introduce a spatial array of independent “optical needles” and report on physical limitations due to mutual interference of individual beams. We employ a spatial light modulator as a toy model of an actual geometrical phase element and experimentally observe controllable spatial arrays with various numbers and spatial separations of individual beam. Lastly, we examine the distortions caused by propagation through planar air-dielectric interface and attempt to compensate it.
关键词： Structured light,Focal lines,Diffraction,Optical Needle,Multiple focal spots,Optical engineering,Bessel beams
更新于2025-09-12 10:27:22
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A compact LED-based projection microstereolithography for producing 3D microstructures
摘要： projection microstereolithography (pμSL) is a promising additive manufacturing technique due to its low cost, accuracy, speed, and also the diversity of the materials that it can use. Recently it has shown great potentials in various applications such as microfluidics, tissue engineering, micro-optics, biomedical microdevices, and so on. However, studies on pμSL are still ongoing in terms of the quality and accuracy of the construction process, which particularly affect the fabrication of complex 3D microstructures and make it attractive enough to be considered for commercial applications. in this paper, a compact LeD-based pμSL 3D printer for the fabrication of 3D microstructures was developed, and the effective parameters that influence the quality of construction were thoroughly investigated and optimized. Accordingly, a customized optical system, including illumination optics and projection optics, was designed using optical engineering principles. This custom 3D printer was proposed for the pμSL process, which besides improving the quality of construction, led to the reduction of the size of the device, its cost-effectiveness, and the repeatability of its performance. To demonstrate the performance of the fabricated device, a variety of complex 3D microstructures such as porous, hollow, helical, and self-support microstructures were constructed. in addition, the repeatability of the device was assessed by fabricating microstructure arrays. the device performance showed that the lateral accuracy of printing was better than 5 μm, and the smallest thickness of the printed layer was 1 μm. Moreover, the maximum printable size of the device was 6.4 mm × 4 mm × 40 mm.
关键词： additive manufacturing,projection microstereolithography,optical engineering,microstructures,3D printing
更新于2025-09-12 10:27:22