Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Cost efficient Diode Lasers for Industrial Applications

15.04.2016

The »Brilliant Industrial Diode Lasers« (BRIDLE) project has been finished successfully after 42 months of intense research activities. BRIDLE was made possible by funding from the European Commission. The seven project partners finished their work at the end of February 2016. The project was coordinated by »DILAS Diodenlaser GmbH« (Germany), the project partners are located in Germany, UK, Switzerland, France and Finland. BRIDLE targeted a major increase in the brightness achievable in direct diode laser systems, based on advances in diode laser and beam -combining technology. Throughout, the highest conversion was sought as was compatibility with low cost, volume manufacture.

Seven partners for various scientific issues


DWDM prototype consisting of actively cooled DFB mini-bars.

Fraunhofer ILT, Aachen.


Mounting of individually addressable diode lasers with rear and front facet access for CBC.

© CNRS-IO, Palaiseau / Fraunhofer ILT, Aachen.

Design and technological development of high performance diode lasers was performed by three partners within BRIDLE. First, the Ferdinand-Braun-Institut für Höchstfrequenztechnik im Forschungsverbund Berlin e.V. (FBH) developed novel epitaxial designs and process technology.

Those developments enabled the use of broad area mini bars with a narrow stripe width of only 30 µm to operate with a brightness that is increased by at least a factor of two in comparison with state of the art chips with a 100 µm stripe width. Furthermore, highly brilliant narrow-stripe DFB diode lasers with monolithically-integrated surface gratings were developed and optimized to simultaneously deliver narrow spectrum (< 1nm), high power (5W), high efficiency (50%) within a low beam parameter product (< 2mm-mrad) for the first time.

... more about:
»Diode »Fraunhofer-Institut »ILT »Lasertechnik »lasers

For coherent coupling experiments, monolithically grating-stabilized tapered diode lasers were developed, with record (54%) conversion efficiency. Second, ridge waveguide diode lasers for coherent coupling experiments were developed by Modulight Inc., which deliver an output power of 1 W per emitter. Finally, design optimization was supported through detailed simulation work performed by University of Nottingham (UNott).

Based on the high brightness diode laser mini bars developed within the BRIDLE project, DILAS was able to simplify its well-known T-bar concept for 105 µm fibre coupling. Furthermore DILAS could increase the optical output power up to 300 W ex 100 µm. The modules wavelength’can be stabilized and used for dense wavelength multiplexing to further increase output power and brightness. The assembly process is fully automated.

Fraunhofer Institute for Laser Technology ILT analyzed and compared different techniques for dense wavelength multiplexing. These techniques include different approaches based on surface gratings, simultaneous wavelength stabilization and multiplexing by use of dielectric filters and VBGs as well as DWDM of wavelength chirped DFB diode lasers by dielectric filters. Filters from different international manufacturers were tested thoroughly. For the first time, Fraunhofer ILT has developed concepts which can be used to implement and test compact modules in the medium power range of 10 W to 100 W output power, with a fiber having a core diameter of 35 µm and a numerical aperture of 0.2. 46 W were realized experimentally. A 7:1 fiber combiner (35/105 µm) was developed for further power scaling.

Centre National de la Recherche Scientifique/Institut d’Optique (CNRS-IO) demonstrated a new architecture for passive coherent combining of diode laser with ridge lasers (delivered by Modulight) and tapered lasers (delivered by FBH). The set-up is based on the separation of the phase-locking stage, which takes place in an external cavity on the rear side of the lasers, and the beam combining stage ,which is achieved outside the cavity on their front side. This configuration demonstrates successively a combined power up to 7.5 W in a single beam from a bar of five high-brightness emitters, using a specifically designed diffractive combiner. Furthermore, the active coherent combining of five tapered amplifiers achieved a power of more than 11 W with a combining efficiency of 76%.

The University of Nottingham developed software tools that enable the investigation of coupling between external optics and the diode laser itself. These tools can be used to better understand coherent coupling, wavelength stabilization or parasitic back reflections. UNott developed a dynamic laser simulation tool for CBC diode laser systems. This tool is used in conjunction with external cavity models developed at CNRS-IO to investigate the nature and dynamics of the phase locking mechanisms in CBC laser systems. Furthermore, UNott’s laser simulation tool Speclase was coupled to external optical design software (ZEMAX®) for external cavity simulations at the subsystem level.

Industrial applications of the developed prototypes are investigated by Bystronic Laser AG and Fraunhofer ILT. For instance, lasers manufactured by DILAS are used for Selective Laser Melting of metals at Fraunhofer ILT.

For more information visit the BRIDLE project website ( www.bridle.eu )

Weitere Informationen:

http://s.fhg.de/svD

Petra Nolis | Fraunhofer-Institut für Lasertechnik ILT

Further reports about: Diode Fraunhofer-Institut ILT Lasertechnik lasers

More articles from Power and Electrical Engineering:

nachricht The role of Sodium for the Enhancement of Solar Cells
17.07.2018 | Max-Planck-Institut für Eisenforschung GmbH

nachricht Behavior-influencing policies are critical for mass market success of low carbon vehicles
17.07.2018 | International Institute for Applied Systems Analysis (IIASA)

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: First evidence on the source of extragalactic particles

For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.

To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...

Im Focus: Magnetic vortices: Two independent magnetic skyrmion phases discovered in a single material

For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.

Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...

Im Focus: Breaking the bond: To take part or not?

Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.

A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...

Im Focus: New 2D Spectroscopy Methods

Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.

"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....

Im Focus: Chemical reactions in the light of ultrashort X-ray pulses from free-electron lasers

Ultra-short, high-intensity X-ray flashes open the door to the foundations of chemical reactions. Free-electron lasers generate these kinds of pulses, but there is a catch: the pulses vary in duration and energy. An international research team has now presented a solution: Using a ring of 16 detectors and a circularly polarized laser beam, they can determine both factors with attosecond accuracy.

Free-electron lasers (FELs) generate extremely short and intense X-ray flashes. Researchers can use these flashes to resolve structures with diameters on the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Leading experts in Diabetes, Metabolism and Biomedical Engineering discuss Precision Medicine

13.07.2018 | Event News

Conference on Laser Polishing – LaP: Fine Tuning for Surfaces

12.07.2018 | Event News

11th European Wood-based Panel Symposium 2018: Meeting point for the wood-based materials industry

03.07.2018 | Event News

 
Latest News

Microscopic trampoline may help create networks of quantum computers

17.07.2018 | Information Technology

In borophene, boundaries are no barrier

17.07.2018 | Materials Sciences

The role of Sodium for the Enhancement of Solar Cells

17.07.2018 | Power and Electrical Engineering

VideoLinks
Science & Research
Overview of more VideoLinks >>>