- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
[Laser Institute of America ICALEO?? 2017: 36th International Congress on Applications of Lasers & Electro-Optics - Atlanta, Georgia, USA (October 22a??26, 2017)] International Congress on Applications of Lasers & Electro-Optics - Transformation of Gaussian beams into M-beams for advanced microvia drilling
摘要： Typical laser systems produce Gaussian laser beams that may not be suitable for high precision materials processing. This study considers laser microvia drilling of multilayer polymeric substrates for high density interconnects of microelectronics devices. Closely spaced microvias reduce the interconnect distance between the processors to meet the ever increasing demand for transferring large volumes of data at high rates. CO2 lasers of 9.3 μm wavelength is commonly used for drilling microvias in current polymeric substrates because of their higher absorption coefficient at this wavelength than at 10.6 μm wavelength of conventional CO2 lasers. High absorption coefficient provides a volumetric heating mechanism of shallow depth to enable surface-controlled vaporization of the polymeric materials. Gaussian or top-hat laser beams generally leave carbonized polymeric residue at the bottom corner and on the side wall of the microvias, and this residue hinders the subsequent microsoldering of electronic devices to the interconnects. The formation of the residue can be reduced using M-beams for microvia drilling. A thermal model is developed to determine the intensity distribution of the M-beam. To achieve this M-beam from a Gaussian beam, a lens system is designed using the Fresnel diffraction model. Drilling experiments have been conducted using an M-beam and the shape and size of the microvia are found to match the theoretical predictions very well.
关键词： microvia drilling,high density interconnects,Gaussian beams,CO2 lasers,M-beams,polymeric substrates
更新于2025-09-23 15:21:01
-
The Analysis of Fiber and CO <sub/>2</sub> Laser Cutting Accuracy
摘要： The aim of the conducted research was to compare the functional properties and the cutting accuracy of items produced using Fiber lasers in comparison with CO2 lasers. The object of 6 mm thick sheet plates made of S235JR steel cut with the two different laser types were analyzed. The tests covered dimensional accuracy (in accordance with the PN EN 22768-fH standard) and the surface after cutting (in accordance with the PN-EN ISO 9013: 2017-04). The results of the analysis have demonstrated that for the same welding linear energy, more accurate cutting surface is obtained using Fiber laser cutting.
关键词： CO2 lasers,Fiber lasers,S235JR steel,surface quality,cutting accuracy,dimensional accuracy
更新于2025-09-19 17:13:59
-
Lasers Improve Display Glass Cutting
摘要： Non-contact glass cutting by laser offers an attractive alternative to mechanical methods in display fabrication. There are several laser technologies and processing techniques in actual use, each with its own characteristics and advantages.
关键词： CO2 lasers,laser glass cutting,non-contact cutting,filamentation cutting,display fabrication,laser ablation,CO lasers
更新于2025-09-19 17:13:59
-
Fabrication of diamond diffractive optics for powerful CO2 lasers via replication of laser microstructures on silicon template
摘要： New approach to fabricate diamond diffractive optical elements (DOEs) with continuous relief for powerful CO2 lasers is proposed and tested. It involves short-pulse laser microstructuring of a silicon wafer, which further is used as a substrate for polycrystalline diamond growth in a microwave plasma-assisted CVD process. After fine mechanical polishing of the growth side of the diamond film, the silicon substrate is removed via chemical etching. Two different DOEs providing close to 100% diffraction efficiency were fabricated with this technique: cylindrical Fresnel lens with kinoform surface profile and three-beam splitter with continuous microrelief. Optimization of the laser processing conditions has made possible to reduce the final roughness of the structured diamond surface to 200-400 nm depending on the local relief depth (0-7 μm). Both DOEs tested with a CO2 laser have demonstrated high transparency and diffraction efficiency, as well as low radiation scattering of the IR radiation at the surface irregularities.
关键词： laser microstructuring,diffraction efficiency,CVD process,diamond diffractive optics,CO2 lasers,silicon template
更新于2025-09-12 10:27:22
-
Understanding Lasers (An Entry Level Guide, Fourth Edition) || Gas Lasers
摘要： Most gas lasers share some key features. Gas is put into a tube, mirrors are put on the ends, and an electric discharge is passed through the gas to produce a population inversion. The details vary quite a bit. The discharge may pass across the tube or along its length. Some molecular gases emit in the mid to far infrared on vibrational or rotational transitions. Atomic gases tend to emit in or near the visible. Ionized gases may emit in the visible or ultraviolet. One odd family of short-lived molecules emits bright ultraviolet pulses. The result is a varied group of lasers that share important features and can illustrate some important aspects of laser physics. Two families of gas lasers, carbon dioxide (CO2) and excimer lasers, are important commercially, but other gas lasers have become niche products. This chapter will explore the basics of gas lasers and teach you about the most important types.
关键词： gas lasers,CO2 lasers,excimer lasers,electric discharge,population inversion
更新于2025-09-11 14:15:04