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13.08.2018 | Basic Technologies | News | Online-Artikel

Microstructuring of large surfaces using a UV Laser System

verfasst von: Nadine Winkelmann

2 Min. Lesedauer

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The company Coherent, in collaboration with Fraunhofer Institute for Laser Technology (ILT), hopes to develop new methods of gentle surface treatment using a short wavelength, high performance excimer laser system. The preparation of carbon fibre reinforced plastic (CFRP) adhesive surfaces is just one example of the many possible applications.

In the last few years, the rapid growth in display manufacture for mobile devices has ushered in a drastic renaissance for excimer lasers. The lasers' UV radiation allows for precise modification of silicon and the dissolution of extremely thin polymer layers during the laser lift-off process. According to Fraunhofer ILT, the application potential for this laser technology is far from exhausted. In a collaborative project spanning several years with the company Coherent, the institute aims to develop new procedures using a LineBeam system. The system offers a 155 mm long, 0.3 mm wide laser beam, as well as an approximately 150 W stabilised UV output with a wavelength of 248 nm. UV radiation has a short wavelength and each laser pulse can reach an energy value of more than 1 J, allowing both removal of various materials at a micrometre resolution and rapid, selective processing of layer systems in the micro- and nanometre range.

New laser processes also for lightweight construction

"Our goal is to qualify new applications and new materials that can be subsequently scaled up for industrial production," explains Dr. Arnold Gillner, Head of Ablation and Joining at Fraunhofer ILT. One of the first areas of focus is the processing of fibre composites. The excimer laser can be utilised for carefully controlled, precise preparation of CFRP adhesive surfaces. Another application is large-surface removal of release layers in the production of CFRP components. These applications could be appropriate to aviation as well as ship building. Targeted modification of surfaces is a further aim of the collaboration: these modifications provide technical components with additional functionalities, which could otherwise only be manufactured with the aid of expensive coatings.

The low penetration depth of the UV radiation enables the surface to be functionalised at the same time as maintaining a very low heat input. Due to its very short wavelength, the excimer laser is superior even to new ultra-short pulse lasers. Alongside the evaluation of procedures for processing, the laser can also be used to test materials for their machinability. One possible application is the efficient production and modification of nanoscale graphene layers, in which the short wavelength of 248 nm and the associated high photon energy plays a decisive role.

 

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