Global Calendar

SPIE Photonics West 2018

San Francisco, California, United States

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Technical papers presented by Coherent | DILAS can be found under the diverse SPIE Photonics West Laser Conferences.

Conference 10514: High-Power Diode Laser Technology XVI
Monday to Tuesday, January 29th - 30th, 2018

Monday, January 29, 2018

Paper 10514-7: Visible high power fiber coupled diode lasers
Time: 11:10 AM - 11:30 AM | Part of SPIE LASE
Session 1: New High Power Wavelengths
Author(s): Bernd Köhler, Simon Drovs, Michael Stoiber, Sascha Dürsch, Heiko Kissel, Tobias Könning, Jens Biesenbach, DILAS Diodenlaser GmbH (Germany); Harald König, Alfred Lell, Bernhard Stojetz, Andreas Löffler, Uwe Strauss, OSRAM Opto Semiconductors GmbH (Germany)  

The continuous brightness improvement of visible diode lasers enabled new applications in very different areas. However, as most of these lasers are based on single emitters, power scaling quickly leads to bulky laser units with a lot of optical components to be aligned. We report on a new approach based on 450 nm diode laser bars, which dramatically reduces size and alignment effort of such laser units. These activities were performed within the german government-funded project “BlauLas”. We show results of a 200 µm fiber coupled 35W source @ 450 nm, which has been reduced in size by a factor of 25 compared to standard single emitter approach. In addition, we will present a 400 µm fiber coupled laser unit with 300 W and demonstrate the roadmap for further power scaling into the kW range.

Paper 10514-14: Diode lasers optimized in brightness for fiber laser pumping                                                         
Time: 3:30 PM - 3:50 PM | Part of SPIE LASE
Session 3: High Power Diode Laser Technology II
Author(s): Marc T. Kelemen, Jürgen Gilly, Coherent | DILAS Semiconductor Business Unit (Germany); Patrick Friedmann, DILAS Diodenlaser GmbH (Germany); Sascha Hilzensauer, DILAS Semiconductor Business Unit (Germany); Lukas Ogrodowski, DILAS Diodenlaser GmbH (Germany)

Fiber coupled modules benefit from continuous improvements of high-power diode lasers on chip level regarding output power, efficiency and beam characteristics resulting in high-brightness. We present our latest results for the improvements in beam quality for InGaAs/AlGaAs broad-area single emitters with resonator lengths of 4-5mm emitting at 976nm. By optimizing the diode laser design a beam parameter product of less than 5mm x mrad has been achieved at 15W with a maximum wall-plug efficiency of more than 68%. From these designs also mini-bars consisting of 5 emitters have been realized.

Tuesday, January 30, 2018

Paper 10514-37: Alternate cooling and use schemes for low SWaP fiber pump modules
Time: 5:00 PM - 5:20 PM | Part of SPIE LASE
Session 7: High Performance Bar Technology
Author(s): David A. Irwin, Joseph Braker, Tina Guiney, Naji Barakat, DILAS Diode Laser, Inc. (United States); Chris Ebert, Nufern (United States)                                        

Recent developments in high power fiber lasers show the field has reached a high level of maturity. However, much work remains before fibers lasers are ready for many of the field applications currently envisioned. Constraints set by system size, efficiency, and environmental requirements demand that novel modes of operation be considered. Coherent | DILAS will report on efforts to extend the use range of existing, SWaP optimized fiber pump modules into territory more appropriate for the more demanding of these applications. In particular, operation with non-standard cooling architectures, pulse schemes, and wavelength stabilization will be discussed and results shown.

Conference 10513: Components and Packaging for Laser Systems IV
Tuesday to Thursday, January 30th - February 1st, 2018

Wednesday, January 31, 2018

Paper 10513-17: Modular high power diode lasers with flexible 3D multiplexing arrangement optimized for automated manufacturing
Time: 2:10 PM - 2:30 PM | Part of SPIE LASE
Session 4: Laser Diode Packaging I
Author(s): Tobias P. Könning, DILAS Diodenlaser GmbH (Germany)

A novel 3-dimensional arrangement of mirrors is used to re-arrange beams from 1-D and 2-D high power diode laser arrays. The approach allows for a variety of stacking geometries, depending on individual requirements. While basic building blocks, including collimating optics, always remain the same, most adaptations can be realized by simple re-arrangement of a few optical components. Due to fully automated alignment processes, the required changes can be realized in software by changing coordinates, rather than requiring customized mechanical components. A variety of high power diode laser modules, ranging from a few hundred watts of optical output power to multiple kilowatts, have been realized based on this concept.

Paper 10513-21: Novel packaging for CW and QCW diode laser modules for operation with high power and duty cycles                                        
Time: 4:00 PM - 4:20 PM | Part of SPIE LASE
Session 5: Laser Diode Packaging II
Author(s): Wilhelm Fassbender, Jens Lotz, Jens Biesenbach, DILAS Diodenlaser GmbH (Germany)

We present the latest performance and reliability data, of several novel high-brightness CW / QCW arrays, in an industrial, modular building design, for operation with high power and duty cycles. All designs are based on single diode packages consisting of 10mm laser bar. Soft or hard soldered. The available optical output power is shown to be strongly depended on the wavelength and fill factor of the laser bars as well as on the QCW conditions and heatsink design in combination with active or conductive cooling. One of the new applications is an actively cooled, micro channel heat sink stack, CW operated above 250W at 20°C with 1.1mm vertical pitch.

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