Technology



FOCUSED ENERGY

 

Ultra-High Brightness Industrial Diode Laser Solutions

DirectPhotonics' innovative industrial high power diode lasers unite high beam quality, similar to that of disk and fiber lasers, with a robust design and improved manufacturability. The technology, which was developed and patented by Fraunhofer in Germany and in the US, avoids complex brightness enhancing resonators, and instead uses passive optical elements to combine the beams of the individual into one ultra high brightness beam. The resulting laser systems are reliable sources for material processing, especially for welding and cutting, with low cost of ownership and a small footprint.

  • Highest Efficiency and Reliability
  • Ultimate Compactness
  • Superior Power Scalability
  • Wide Range of Technical Flexibility


DirectPhotonics' diode lasers applications are not limited to material processing, thanks to the wavelength stabilization and the availability of different wavelength diode material, the systems also are excellent pump sources. The ultra high brightness direct and fiber coupled diode lasers enable new and improved pumping schemes, especially for resonant pumping at 15xx nm and the pumping into narrow absorption bands like the 976 nm in ytterbium fiber lasers.

 

 

Application Note - Oscillation Welding

The performance of the 500 W DirectProcess direct diode laser for oscillating welding by utilizing a novel trepanning optic is discussed for its application to aluminum/aluminum and aluminum/cop- per joints. Welding results were analyzed for but welds of aluminum samples with thicknesses up to 1.5 mm and copper with sample thicknesses up to 0.2 mm.
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Application Note - Steel Cutting

The performance of the 500 W DirectProcess 900 direct diode laser in flat sheet metal cutting experiments is discussed for its application to steel. Cutting results were analyzed for mild steel and stainless steel samples with thicknesses of up to 6.4 mm and 3.4 mm, respectively. The cutting speed and the cut quality can compete with the performance of current fiber lasers.
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Highly Modular High Brightness Diode Laser System Design for a wide application Range

For an economic production it is important to serve as many applications as possible while keeping the product variations minimal. We present our modular laser design, which is based on single emitters and various combining technics.
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Beam Combining Techniques for High-Power High-Brightness Diode Lasers

We discuss various approaches for beam combining with emphasis on solutions pursued at DirectPhotonics. Our design employs single emitter diodes as they exhibit highest brightness and excellent reliability. In a first step, after fast axis collimation, all single emitter diodes on one subunit are stacked side-by-side by a monolithic slow-axis-collimator thus scaling the power without enhancing the brightness.
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Direct diode lasers and their advantages for materials processing and other applications

In terms of applications, especially our (broad) wavelength combining technology for power scaling opens the window to new processes of cutting or welding and process control.
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Generating a high brightness multi-kilowatt laser by dense spectral combination of VBG stabilized single emitter laser diodes

By using a geometry that accesses the BPP of the individual diodes, generating a multi kilowatt diode laser with a BPP comparable to fiber lasers is possible. We demonstrate such a modular approach for generating multi kilowatt lasers by combining single emitter diode lasers.
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Ultra High Brightness Laser Diode Modules around 1.5 μm for Highly Efficient Resonant Pumping

A very stable narrow bandwidth pump source is necessary to achieve high pump efficiencies in resonantly pumped lasers. Typical laser diodes have a FWHM of more than 5 nm, and the center wavelength shifts with pump current and diode temperature. This is sufficient for most solid state lasers, but the narrow pump levels of the resonantly pumped Er:YAG lasers require a more narrow pump source, since all the power not deposited in the pump levels is lost through up-conversion, exited state absorption and heat. To further increase the pump efficiency it is also possible to pump with 1532 nm instead of 1455 nm to take advantage of the higher quantum efficiency, but the 1532 nm band is narrower and thus a pump source with a very stable center wavelength and narrow bandwidth is needed for effective pumping. In fact, Er:YAG lasers can be pumped simultaneously by all five possible pump wavelength to achieve high power laser output at 1.6 μm.
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Application Note - Oscillation Welding

The performance of the 500 W DirectProcess direct diode laser for oscillating welding by utilizing a novel trepanning optic is discussed for its application to aluminum/aluminum and aluminum/cop- per joints. Welding results were analyzed for but welds of aluminum samples with thicknesses up to 1.5 mm and copper with sample thicknesses up to 0.2 mm.
Download PDF

Application Note - Steel Cutting

The performance of the 500 W DirectProcess 900 direct diode laser in flat sheet metal cutting experiments is discussed for its application to steel. Cutting results were analyzed for mild steel and stainless steel samples with thicknesses of up to 6.4 mm and 3.4 mm, respectively. The cutting speed and the cut quality can compete with the performance of current fiber lasers.
Download PDF

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