We present newly developed high power diode laser modules which are performing at outstanding power densities and line uniformity. The combination of recently designed laser diode bars on passive heat sinks and optimized micro-optics results to laser modules with power densities > 100kW/cm2 in a line length of 12mm x 0.1mm. The usage of non periodic structured homogenizers leads to a homogeneity of less than 3% p/v which allows precise heating and annealing applications. The application for such laser lines are hardening, metallization and annealing of different materials. In the presentation we will show results of thin film Si-a annealing process with direct diode laser annealing.
Fiber-coupled diode lasers have become an established source for many industrial applications due to their high wall-plug
efficiency, minimal maintenance and cost per watt. To decrease system size and cost for cooler and driver, high
coupling efficiencies have become more and more important.
Recent developments in broad area laser diode bars (BALB) and beam shaping systems with micro-optical components
are leading to new highly efficient fiber coupling.
We present newly developed high power diode laser modules which are performing at outstanding efficiencies with
smallest package design. The combination of recently designed laser diode bars on passive heat sinks and optimized
micro-optics results in laser modules with up to 60W out of a 200μm fiber with a 0.22 NA and > 50% electro-optical
efficiency out of the fiber core, based on only one laser diode bar.
The applications for such laser diode modules range from pumping of fiber lasers and amplifiers, over materials
processing to medical applications.
The presentation of the technology will show a path to scale high-brightness laser systems to higher power levels and
efficiencies. The combination of different coupling techniques will allow laser modules with 100W out of 100μm fiber
core up to 1.6kW out of 400μm fiber core with electro-optical efficiencies of > 45%.
We present new developed high power diode laser modules which are performing at outstanding brightness and their
applications. The combination of recently designed laser diode bars on passive heat sinks and optimized micro-optics
results to laser modules up to 50W out of a 100μm fibre with a 0.22 NA at one single wavelength based on broad area
laser bars (BALB) and up to 50W out of 50μm fibre with a 0.22 NA based on single-mode emitter array laser (SEAL)
bars. The fibre coupled systems are based on diode lasers with a collimated beam of superior beam data, namely < 10
mm x 10 mm beam diameter (FW1/e2) and < 2mrad x 2mrad divergence (FW1/e2). Such free beam diode lasers deliver
30 W or 60 W output power.
The applications for such laser diode modules varies from direct marking, cutting and welding of metals and other
materials up to pumping of fibre lasers and amplifiers. Marking speed with up to 30mm/s on stainless steel was
observed with 20W laser power and 50&mgr;m fibre with a conventional marking setup. Cutting speed of about 1m/min of
0.2mm Kovar sheet was shown with a diode laser module with 50W laser power from a 100&mgr;m fibre.