The interest in fiber lasers has increased dramatically in the last decade. The main driving force is coming from the industry, where these lasers are used for different kinds of materials processing such as cutting, drilling, and welding.
The fiber laser offers many advantages compared with conventional lasers in terms of better beam quality, lower prices, and a more compact design. However, it turns out that the glass material in the optical fiber looses its transparency with time, a phenomenon called "photodarkening".
This effect considerably shortens the operational lifetime of the fiber laser.
"This is primarily a concern at high output levels associated with applications using a pulsed laser configuration," says Magnus Engholm, a doctoral candidate in fiber optics.
One example of such applications is marking, where part of the surface material has to be burnt off from the object to be marked.
Fortunately the glass material can be optimized to extend the lifetime of these lasers. By choosing a proper composition and optimizing the synthesis conditions, scientists can now attain higher output powers and longer lifetimes. This will also open up for new areas of industrial application.
This research has been carried out collaboratively by Mid Sweden University and Acreo FiberLab.
Please direct any questions to: Magnus Engholm, phone: +46 (0)60-14 87 37; cell phone: +46 (0)70-483 8183; e-mail: Magnus.Engholm@miun.se
Pressofficer Lars Aronsson, +46-705 165 336;Lars.Aronsson@miun.se
Lars Aronsson | idw
Silicon solar cell of ISFH yields 25% efficiency with passivating POLO contacts
08.12.2016 | Institut für Solarenergieforschung GmbH
Robot on demand: Mobile machining of aircraft components with high precision
06.12.2016 | Fraunhofer IFAM
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
08.12.2016 | Life Sciences
08.12.2016 | Physics and Astronomy
08.12.2016 | Materials Sciences