Research Projects

MASTER

Multi apertur ultrashort pulse laser –and scanning technology for high-rated laser material processing.

Subproject: Highspeed multi apertur polygon mirror scanning system

Motivation

Due to their good quality and low amount of heat input, ultra-short pulsed lasers (USP) have proven their value as a universal tool in laser material processing. USP lasers have been utilized to fabricate precise micro-scaled geometries almost melt free in terms of laser micro drilling, laser cutting or laser surface processing. To establish the USP technology in industrial production, the process and system technology itself needs to be adapted to the requirements of the end user. Also, the economic efficiency needs to be increased compared to established processing methods.

Goals and approach

Active Fiber Systems is iunvestigating a kilowatt-USP-laser source, that can be switched quickly on two different outputs. Both beam paths lead through a new polygon scanner, developed by MOEWE, which overcomes the downtime during the facet change on the polygon mirror. The almost loss free beam distribution is taking place in the same scanning field, with up to 1.000 m/s. The new system will be used for process investigations at University of Applied Sciences Mittweida, where it is oriented closely on the requirements of the associated industrial partner . The substitution of a wet chemical method by a laser process and the drag reduction address economic and environmental goals.

Innovation and perspectives

Overcoming the downtime of the laser allows an almost loss-free laser processing with high-power-USP-lasers (1 kW) using extremely high deflection speeds of up to 1.000 m/s. Resulting in new processing rates in the area of USP processing , the productivity will increase significantly. This new kind of technology enables the scaling of existing laser processes to a higher throughput, as well as the developing of new fields of application for laser technologies, such as energy sector, automotive industry, aerospace, medical and biotechnology, architecture and electronics.

Partner
Active Fiber Systems GmbH, Ernst-Ruska-Ring 17, 07745 Jena
Hochschule Mittweida University of Applied Sciences, Technikumplatz 17, 09648 Mittweida
Siemens Energy Global GmbH & Co. KG
MOEWE Optical Solutions GmbH, Schillerstraße 10, 09648 Mittweida

The project is funded by the federal ministry of  education and research with grant number 13N15882 .

WIR! GRAVOmer HoluMi 3D

Highly dynamic laser technology for ultrarapid, precise micro structuring of threedimensional surfaces

Subproject: Plant technology

Ultrashort pulse laser (USP Laser) are particularly suitable for high-precision microprocessing of surfaces, which are exposed to only a small amount of thermal pressure, due to short laser pulses. Therefore the material can be stripped superfine and precise. One problem of USP laser processing is, that currently only a small amount of machining speed can be achieved and implemented into performance. Hence, economical microstructuring of large surfaces is in actuality inconvertible.

To break these technological boundaries, the scheduled research and development project will pursue an innovative laser processing system as a goal. This system will enable highly precise, threedimensionally  shaped surfaces (e.g. pre-structured embossing rollers, injection moulding or forming tools), by using new high performance USP Laser and  polygonscanner. This new technology will enable the economic functionalization of components that are used for optimization and specific modulation of design, internal friction, optic and haptics, dirt adhesion or cell growth, by using threedimensional micro and nano structures.

Partner:
ACSYS Lasertechnik GmbH, Leibnitzstraße 9, 70806 Kornwestheim
Laserinstitut Hochschule Mittweida, Schillerstraße 10, 09648 Mittweida
MOEWE Optical Solutions GmbH, Schillerstraße 10, 09648 Mittweida

The project is funded by the federal ministry of  education and research with grant number 03EE1008C.

PoLariS

Production technology for laser-based manufacturing of crystalline solar cells of the next generation

Aim of the project:
The aim is to increase the productivity of the laser-based fabrication of crystalline solar cells. Especially, the off time of the laser has to be minimized. To reach this aim, the laser process is transformed towards a treatment of continuously moving wafers using a camera-based position detection.

In this project, MOEWE develops a 2D polygon mirror scanner with an increased line frequency > 2 kHz with an operating laser wavelength in the UV range (343 nm) for large area micro structuring of crystalline solar cells. The development includes a new motor design for the fast-rotating polygon mirror wheel and new electronics. The adaption of the mirrors to the UV wavelength requires investigations of new optical coatings.

The scanner is able to process the positioning data from the detection system for each scanned line in advance and can follow the moving work piece with the laser beam in real time. For highest accuracy, a fast laser beam switching with > 50MHz will be realized together with the partner Edgewave. A f theta objective will be developed from the partner Jenoptik, that is adapted to the pivot points of the polygon mirror scanner.

Finally, a new developed scanner will be integrated by Fraunhofer ISE and InnoLas Solutions into an existing machining center or a new demonstrator. From the usage, new knowledge will be gained concerning long term stability and reproducibility of ultra-fast laser beam processing with resolutions in the micrometer range. These results will be used for optimizations of the system.

Partners:
Fraunhofer-Institut für Solare Energiesysteme ISE, Heidenhofstrasse 2; 79110 Freiburg
JENOPTIK Optical Systems GmbH, Göschwitzer Straße 25 in 07745 Jena
EdgeWave GmbH, Carlo-Schmid-Str. 19, 52146 Würselen
InnoLas Solutions GmbH, Pionierstraße 6,82152 Krailling
MOEWE Optical Solutions GmbH, Schillerstraße 10, 09648 Mittweida

The project is funded by the federal ministry of economics affais and energy under the project PoLariS with grant number 03EE1008C.

Market launch of high-performance polygon mirror scanner

The project promotes the market launch of an innovative ultra-fast 2D polygon mirror scanner. Firstly, a pilot run with three devices is realized. Later, the devices will be used in the company as a fair model or free demo devices for advertising purposes.

The funding also includes the registration of intellectual property rights for the research and development work, the certification of the scanners by a third party and the design of a website by professional web designers.

The work is supported by the European regional development fund.

Transfer

The purchase of intellectual property rights enables MOEWE Optical Solutions GmbH to bring the polygonal mirror scanner developed and already built at Mittweida University of Applied Sciences to the market and develop it further.

The scanner uses two innovations of pixel clocking and double polygon. Pixel clocking allow the full digitization of the device resulting in significantly higher accuracy and very good controllability, while the double polygon enables low optical distortions in a very compact design working with high power laser beams and large beam diameters.

The work is supported by the European regional development fund (EFRE).