Development of a hollow laser beam for micromachining

Abstract

Current laser cladding technologies have limited resolutions of about 50 μm. A new solution has been developed within the project ‘Nanomicro’ to improve the spatial resolution. The ‘micro hollow laser beam system’ and a deposition system for highly focused metal micropowders are innovative parts within a high-precision 3D micromanufacturing laser cladding platform. We demonstrate, here, a new hollow laser sintering concept that is aiming on more efficient laser cladding and manufacturing of highly precise and functional parts in the range of a few microns.

Powder-Based 3D Printing for the Fabrication of Device with Micro and Mesoscale Features

“…The powder-based 3D printing avoids shortcomings of SLA and other 3D-printing techniques based on photopolymerization, but it suffers from limited resolution and undesired optical properties (e.g., non-transparent). Fortunately, a new-generation of powder-based 3D-printer attempts to address some of these challenges [ 48 , 51 , 58 , 59 , 60 , 123 , 239 ]. Once these barriers are lifted, powder-based 3D printing will be more widely applicable.…”

“…The conventional micromachining techniques are unable to achieve true 3D structures and face challenges in manufacturing complex shapes [ 46 , 47 ]. Significant effort has been put into developing micro 3D printing processes based on stereolithography (SLA), material/binder jetting, micro selective laser melting/sintering processes and micro cladding [ 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 ]. Although micro 3D printing can print true 3D microfeatures, its throughput is too low for industrial scale manufacturing [ 48 , 49 , 50 , 51 , 52 , 53 ] and most of these techniques are still under development phase.…”

High-Power, High-Purity HG0n Hermite–Gaussian Laser Beam Generation in Cascaded Large Aspect Ratio Slabs

“…2023, 13, 11062 2 of 11 of dark bars in the y-direction is n, so the HG 0n laser beams display as strip shape. Due to the fact that HG 0n laser beams can be easily converted into vortex Laguerre-Gaussian (LG pl ) beams carrying orbital angular momentum (OAM) by adopting the Astigmatic Mode Converter (AMC), the applications of HG mn laser beams have been further expanded [13][14][15], and the HG 0n laser beams with both high average power and high peak power are expected to be obtained.…”