Laser Technik Journal Im Laser Technik Journal erfahren Anwender und Entwickler von moderner Lasertechnologie die neuesten Trends und Details aus ihrer Branche. Jedes Heft hat ein Schwerpunktthema. Im Rahmen dieses Themas werden in mehreren Beiträgen Systeme und Applikationen aus dem industriellen Umfeld vorgestellt. Dabei stehen technische Informationen im Vordergrund, aber Themen wie Qualitätsmanagement oder Marketing werden ebenso berücksichtigt. Print ISSN: 1613-7728 2010, 7. Jahrgang (6 Ausgaben pro Jahr, 3 in Englisch und 3 in Deutsch) NEU Mediadaten2010, Mediakit2010 (english)

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NEW Issue 1/2010 - FOCUS Photovoltaics

EDITORIAL

INTERVIEW

Keeping the Customer Promise - Interview with Robert Edmund
Like all technology markets, the optical technologies also suffer from thecurrent economic crises. Nevertheless Robert Edmund looks confident into future. Where he expects growth markets and why he considers customer services as important, this and more heard Laser Technik  Journal in the interview with the President and CEO of Edmund Optics.

PHOTOVOLTAICS

Why Pulse Duration Matters in Photovoltaics
Rajesh S. Patel, Jim Bovatsek and Ashwini Tamhankar
Developing the ideal laser scribe process will be a challenge–especially if it‘s used in the photovoltaic industry. Here Q-switched diode-pumped solid-state laser systems are widely used for scribing thin-film layers. As a study now shows, systems with shorter pulses provide remarkable advantages.

Increasing the Photovoltaic Efficiency
Peter Oesterlin and Andreas Purath
Laser applications are already standard for structuring of thin film PV glass panels. But they are not yet widely established in the silicon-wafer-based cell manufacturing. This will change in future because most of the new cell concepts are only feasible by introducing laser processes.

High-Efficiency Silicon Solar Cells Demand New Process Tools
Finlay Colville
Laser-based tools are becoming an essential part of new crystalline silicon cell lines which are configured for high-efficiency performance. Different tooling types are required on a case-by-casebasis. It mainly depends on the level of process development.

Light as a Controlling Tool
Jens Haase
Quality assurance is one of the key factors in mass production. This applies to the photovoltaic industry too, where the optimization of the manufacturing processes currently takes place. Therefore the fast optical 3-D-characterization of surfaces proves to be very helpful.
 

ULTRASHORT PULSES

Femtosecond vs. Picosecond Laser Material Processing
Andreas Tuennermann, Stefan Nolte and Jens Limpert
As the miniaturization of components and devices is ongoing, finer structures are required. Laser processing with conventional laser sources is limited by thermal or mechanical damage. Various research activities based on the use of ultra short laser pulses with picosecondor femtosecond duration are looking forward to a solution.

Ready to Work
Keming Du
Solid slab lasers combine crystal shape, cooling and resonator designin an optimal way. The resulting special features enable a variety ofunique applications with added value such as glass processing, pumping of dye lasers for scientific applications or edge deletion in photovoltaic production.

BEAM ANALYSIS

Observe the Beam at the Center of Interest
Harald Schwede
The characteristics of the focused beam fundamentally determine the result of the laser process. Therefore measurements at the focus of high power laser are a very demanding task. Different concepts exist to realize a practical focus diagnostics.

TUTORIAL

Fiber Amplifiers - Part 3 : A Technology for Many Applications
Rüdiger Paschotta
In fiber amplifiers exist a complicated interplay of a variety of effects. In principle, these effects are highly predictable. However, simple methods of obtaining estimates often fail. In this situation, numerical modeling has crucial advantages over a trial-and-error approach in the lab.

CALENDAR/MEETINGS

SERVICE: BUYERS’ GUIDE

ADVERTISER INDEX

Ausgabe 6/2009 - Prozessüberwachung

EDITORIAL

INTERVIEW

SCHWEISSEN & SCHNEIDEN 2009
Positive Stimmung auf der Leitmesse für Fügetechnik in Essen.

PROZESSÜBERWACHUNG

Qualitätskontrolle bei Laserschweißnähten
Christoph Döttinger
Das Laserschweißen verspricht eine hohe Nahtqualität. Die Wärmeflussthermografie ist ein Verfahren, um diese Qualitätzerstörungsfrei, berührungslos und bildgebend zu dokumentieren.

Laser-Schwingungsmesstechnik in der Serienproduktion
Jörg Sauer und Philipp Holzmann
Viele geschweißte Bauteile müssen im Betrieb starken Vibrationen standhalten. Laservibrometrie erlaubt eine exakte Vermessung des Schwingungsverhaltens der Bauteile in der Qualitätsprüfung.

Properties and Prospects of High Brightness Solid State Lasers
Frank Vollertsen
The new generation of solid state lasers like disc and fiber lasers offers the feasibility of new processes. There are two main reasons forusing these sources in welding: the high beam quality as well as the high efficiency.

Zellulare Neuronale Netzwerke
Andreas Blug
Fertigungsüberwachung in Echtzeit? 10.000 Bilder pro Sekunde verarbeiten? Eine neue Kameraarchitektur erlaubt die Regelung von Schweißprozessen in Echtzeit.

Den Schweißpunkt immer im Fokus
Thomas Nicolay und Volker Bayer
Bei Opel sorgt ein optisches Nahtverfolgungssystem für einepräzise Führung des Laserstrahls während des Schweißens. Das Verfahren liefert nicht nur eineschöne Naht – es spart auch Zeit und Material.

LASERSCHWEISSEN

CO₂ Lasers and Robotics in Modern Automotive Manufacturing
Frank Gaebler und Christopher Clark
Kompakte CO2-Laser haben sich Anwendungen jenseits der Metallbearbeitung erobert. Kunststoff- oder sogar Lederteile für das Fahrzeuginnere werden heute mit dem Laser bearbeitet, weil er schneller und sauberer ist.

FASERLASER

Schweißtechnische Anwendungen der Hochleistungs-Faserlaser
Berthold Kessler
Wirkungsgrad und Modularität erlauben beim Faserlaser einenahezuunbegrenzte Skalierung der Ausgangsleistung. 12 kW gilt als Standard, 20 kW sind im Kommen. Vorteile für das Schweißen vor allem von dicken Blechen sind schon jetzt sichtbar.

TECHNISCHE GASE

Hochintensiv und scharf gebündelt
Georg Hopp
Das richtige Gasgemisch hat einen entscheidenden Einfluss auf das Schweißergebnis. Gerade die neuen Hochleistungslaser erfordern eine hohe Reinheit der Gase und ermöglichen dabei erhebliche Geschwindigkeitssteigerungen.

TUTORIAL

Fiber Amplifiers – Part 2
Rüdiger Paschotta
Das Thema Faserlaser ist in aller Munde. Teil 2 dieser Reihe zur Faserlasertechnologie erklärt die Physik dieser komplexen Systeme.

Issue 5/2009 - FOCUS Materials Processing

EDITORIAL

INTERVIEW

Interview with Jens Bleher
Inspite of the economic crisis, the laser branch shows optimism. Managing Director Trumpf Laser- und systemtechnik, Jens Bleher, explains to Laser Technik Journal why and where the market for laser technology still has high potential to grow.

ACCESSORIES

Smart Laser Welding Heads Provide Excellent Quality
Andrey Andreev
Well harmonized components may offer high efficiency as well asproductivity for the whole laser process as the successful collaboration between BBW and Precitec demonstrates.

LASER SYSTEMS

Understanding Materials Processing Lasers
Stuart Woods
New laser technologies provide the materials processor with more options in choosing a laser source. By guiding customers to the optimum technology for their particular needs, laser manufacturers can ensure aquick recovery of the special market segment

Properties and Prospects of High Brightness Solid State Lasers
Frank Vollertsen
The new generation of solid state lasers like disc and fiber lasers offers the feasibility of new processes. There are two main reasons forusing these sources in welding: the high beam quality as well as the high efficiency.

Fiber Lasers – Unlimited Opportunities?
Markus Rütering and Wolfram Rath
Especially in materials processing fiber lasers will show their potential. Even though there exists several new applications for laser cutting, there still remain limits.

Laser-Based Polymer Welding in Medical Device Manufacturing
Jörg Neukum
White and transparent plastics are very important materials for medicaldevice manufacturing. With the new wavelengths becoming available now,diode laser systems are used for those applications as well, allowing the end user to apply the benefits of laser-based plastics welding to white and transparent polymers.

Joining with Transparency
F. Brunnecker, R. Geiger and R. Bühring
Joining of homogenous laser transparent polymer building parts is not only of great interest to medical engineering. Wherever transparent building parts have to be welded in a specially pure and gentle process the use of laser will be the primary choice.

LASER SINTERING

Laser-sintering in the Aerospace Industry is on the Rise
Udo Behrendt
New materials that can be laser-sintered will play a critical role forthe aerospace industry. A continuing development of the laser-sintering system technology together with new materials will further support the spread of laser-sintering as a production process into other market segments and markets such as medical as well.

TUTORIAL

Fiber Amplifiers – Part 1
Rüdiger Paschotta
Today the technology of fiber amplifiers covers an expanding area of applications. Whereas the basic principle of amplification remained unchanged, substantial further technical developments have enabled the adaptation to total different requirements, such as the generation of much higher optical powers.