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2 LTJ January 2011 no. 1 © 2011 WILeY-VcH Verlag GmbH & co. KGaA, Weinheim

LASERJOURNALTECHNIK

1 eDitoRial

4 neWs & inFos

inteRVieW

7 How to stay on top of solid-state laser Development Reinhard Luger

Today solid-state lasers are plug-and-play devices, with long lifetime and high re-liability due to rigorous quality control and semi-automated production. Reinhard Luger, general manager of coherent’s site in Luebeck, reviews the underlying inno-vations and talks about technology and market trends.

PRoDUcts

10 new Products from:coherent (Deutschland), Foba laser marketing + engraving/alltec, Hamamatsu Photonics, High Q laser innovation, Jenoptik laser, lighttrans, lumics, meer-stetter, oWis, Pco, Rauscher, sios meßtechnik, spiricon, toPag lasertechnik, tRioPtics, tRUmPF

PHotoVoltaics

18 trends in solar cell technologies and laser manufacturing

Jan-Gustav Werthen

Key players in current photovoltaic solar-energy solutions, such as crystalline wa-fers, thin-films, and multi-junction concentrator cells, are manufactured with lasers playing an important role in the process. one of the next steps is to solve the chal-lenge of combining high efficiencies of crystalline cells with low costs of thin films.

21 increasing Photovoltaic efficiency on the Production Floor

Peter Oesterlin, Andreas Büchel

Local heating of solar cell wafers leads to improved diffusion of phosphor into the substrate. This allows for optimization of surface properties to fit the special needs of the photoactive and the contact region. Industry-ready green pulsed lasers offer parallel processing of hundreds of contact fingers in a matter of seconds.

25 two concepts changing laser scribing in Photovoltaics

Heinrich Endert, Jürgen Niederhofer

even in established production processes, such as laser structuring of thin-film cells, there is a need for further improvement. In a new scribing concept, several com-pact lasers replace high-power ones and are integrated into the laser heads. This approach simplifies the system setup, reduces costs and allows for a stable and scalable scribing process.

Optoelectronics Photonics Lasersystems Fiberoptics Medical ApplicationsMaterial Machining Displays

www.laser-journal.de LTJ 3

conTenTs

© 2011 WILeY-VcH Verlag GmbH & co. KGaA, Weinheim

29 Reel-to-reel machining with ultra short pulsed lasers Mandy Gebhardt, Jens Hänel, Maurice Clair, Christian Scholz

The steady growing demand for high yield and mass production of flexible electro-nic devices requires new production processes. Integration of a laser source into a reel-to-reel tool enables an on-the-fly structuring of flexible substrates such as thin films, requiring precise laser processing simultaneously to the winding.

beam analysis

34 laser beam Profiling in the Production ProcessManfred Hettwer

Lasers and a niche strategy: cleverly combined, this can develop into a success story. As part of a strategic mix, this has led to more than 20 years of remarkable growth for the mechanical engineering company Weil engineering in Germany‘s Baden.

oPtical comPonents

38 two concentric fiber diameters in one laser light cable

Wolfgang Andreasch, Rudolf Huber, Daniel Mock

Different applications for laser material processing, such as cutting and welding, require a modification in the laser’s beam parameters to produce the best results. A 2in1 fiber contains two concentric fiber core diameters in just one laser light cable. During the cutting process, the laser beam is guided into the inner fiber core and during welding into the outer ring core.

laseR micRo PRocessing

42 UV lasers enable smart Phones and other microelectronics Ralph Delmdahl, Volker Pfeufer

smaller package sizes and increased functionality of today’s smart phones give rise to numerous manufacturing challenges. UV lasers help in the production of various components using techniques such as laser direct imaging, low temperature poly-silicon annealing, and laser lift-off. Further, quality control benefits from lasers due to improved wafer inspection.

45 Direct Fabrication of Periodic structures on surfaces Andrés F. Lasagni, Matthias Bieda, Teja Roch, Denise Langheinrich

In surface functionalization, mechanical, optical and other properties of surfaces can be tuned to the applications specific desires. To this avail, periodic structures can be imprinted on a surface by generating interference patterns of high power laser pulses. This is a scalable method to obtain micro- and sub-micrometer periodic arrays with controlled spatial modulation.

50 calenDaR/ meetings

54 seRVice: bUyeRs gUiDe

60 aDVeRtiseR inDeX

61 mastHeaD

Cover:

The illustration shows DILAs‘ volume manufacturing of fiber-coupled pump modules which is being ramped up for the growing fiber laser market. High coupling efficiencies are available in a wide range of powers, wavelengths, fiber core diameters and configura-tions.