Industry has placed a long list of demands on micro-machining laser systems – the laser beam must be easy to focus, nearly non-fluctuating, and beam re-alignment should be minimised. The system must be as compact as possible, placed close to the workpiece, yet not susceptible to rough manufacturing environments.
Microscopic image of a workpiece made of V70 hard metal, which can be used a stamp.
Up to now, solid-state lasers have been used for metal micro-machining. These systems are usually based on free-beam set-ups, which are easily brought out of alignment. Since the laser systems need water cooling, they are relatively large and difficult to integrate into the production line.
A newly developed, fiber-based picosecond laser system fulfils all the requirements for industrial use. It is the result of a research project PULSAR (PUlsed Laser System with Adaptive Pulse PaRameters). This system is especially flexible and adaptable to different settings because the laser oscillator and amplifier are separated. Depending on the material and the desired process results, the repetition frequency and the average output can be easily adapted to the current process. Thus, quick and up to now unique optimization of the work steps is possible.
A laser diode with a wavelength of 1,03 µm and a pulse length of approximately 40 ps serves as the pulse source. The pulse repetition rate is highly flexible, and can be set between 50 kHz and 40 Mhz. Using a three-step amplifier, the pulse can be amplified from several 10 µW to an average output power of 14 W. At a repetition rate of 1 MHz, a pulse energy of 14 µJ is possible.
The fiber-based, picosecond laser system has an excellent beam quality, and is resistant to difficult production environments, such as dust contamination, temperature fluctuation, or mechanical vibrations. Also, very good results in working aluminum or brass have been achieved. Further, the system is smaller and less expensive than conventional solid-state lasers. There are many fields of applications for this new, high-power laser; among them marking aluminum, or for making stamps of hard metal (V70), for example for stamping coins.
The project PULSAR is subsidized by the BMBF initiative INLAS (Integrated-optical Components for High-power Laser Sources; FKZ: 13N9685). The companies PicoQuant GmbH, InnoLight GmbH, LPKF Laser & Electronics AG, cicor Microelectronics and Alltec GmbH FOBA Laser Marking + Engraving are also involved in the project (see www.ot-inlas.de/pulsar/).
Results of the LZH subproject were presented at the LASE conference/Photonics West 2011 in San Francisco (report number 7914-36) and in the journal Optics Express 19(3), p. 1854 (2011) entitled „All-fiber based amplification of 40 ps pulses from a gain-switched laser diode“.Contact:
Michael Botts | Laser Zentrum Hannover e.V.
Etching Microstructures with Lasers
25.10.2016 | Fraunhofer-Institut für Lasertechnik ILT
Applying electron beams to 3-D objects
23.09.2016 | Fraunhofer-Institut für Organische Elektronik, Elektronenstrahl- und Plasmatechnik FEP
An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...
Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...
Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...
Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales
Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...
Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.
As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...
19.01.2017 | Event News
10.01.2017 | Event News
09.01.2017 | Event News
20.01.2017 | Awards Funding
20.01.2017 | Materials Sciences
20.01.2017 | Life Sciences