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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.






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APPLICATION NOTE

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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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Multi-wavelength resonant pumping of Er:YAG lasersfor energy efficient trace gas detection systems

The multiplicity of narrow absorption lines of erbium ions in the spectral range from 1450 to 1540 nm is exploited for the development of a highly efficient Er:YAG laser emitting at 1645 nm. Resonant pumping of the active medium with an absorption efficiency of up to 96% is achieved using a novel diode laser system consisting of two narrowband modules with a combined output power of 80 W ex fiber. The utilization of multiple pump wavelengths allows for both substantial power scaling and reduction of the laser threshold, thus providing a low power consuming laser system feasible for LIDAR applications.






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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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UHB laser diode module

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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Diodes for resonantly pumped ErYAG-Laser

Diodes for resonantly pumped cw and pulsed Er:YAG Lasers

Eye safe laser radiation at 1.6 μm is realized by a resonantly pumped Er:YAG laser operating in cw- and q-switched mode employing broad and narrow spectrum diodes applied for medical application and trace gas detection.

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Compact High Brightness Diode Laser Emitting 500 W from a 100 μm Fiber

High power, high brightness diode lasers are beginning to compete with solid state lasers, i.e. disk and fiber lasers. The core technologies for brightness scaling of diode lasers are optical stacking and dense spectral combining, as well as improvements of the diode material. Diode lasers have the lowest cost of ownership, highest efficiency and most compact design among all lasers.

Multiple Single Emitter modules allow highest power and highest brightness diode lasers based on standard broad area diodes. Multiple single emitters, each rated at 12 W, are stacked in the fast axis with a monolithic slow axis collimator array. Volume Bragg Gratings stabilizes the wavelength and narrow the linewidth to less than 1 nm. Dichroic mirrors are used for dense wavelength multiplexing of 4 channels within 12 nm. Subsequently polarization multiplexing generates 450 W with a beam quality of 4.5 mm*mrad.

Fast control electronics and miniaturized switched power supplies enable pulse rise times of less than 10 μs, with pulse widths continuously adjustable from 20 μs to cw. Further power scaling up to multi-kilowatts can be achieved by multiplexing up to 16 channels. The power and brightness of these systems enables the use of direct diode lasers for cutting and welding. The technologies can be transferred to other wavelengths to include 793 nm and 1530 nm. Optimized spectral combining enables further improvements in spectral brightness and power.

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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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