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Photonics West 2015
San Francisco, CA
Visit DILAS' booth #4737, North Hall, at Photonics West 2015 the most comprehensive #1 laser, photonics, and biomedical optics conference with over 20,000 attendees and 1,250 exhibiting companies.
Session 1: High Power Fiber Coupled Laser Sources I
Date: Sunday, February 8
Time: 9:40 AM - 10:00 AM
Paper 9348-4: Narrow-line fiber-coupled modules for DPAL pumping
Presenter: Tobias P. Koenning
A new series of fiber coupled diode laser modules optimized for DPAL pumping is presented, featuring greater than 400W from a 600µm core fiber of 0.22NA. Addressing one of the key challenges in DPAL pumping, the modules achieve a spectral width of <<0.1 nm and wavelength tunability of +/- 0.15 nm. A limiting factor in the reduction of the spectral line width is the optical absorption induced thermal gradient inside the VHG. Simulated profiles and demonstrated techniques to minimize thermal gradients will be presented. Data is shown for potassium pumping at 766 nm, with full applicability to other wavelengths of interest.
Session 2: High Power Fiber Coupled Laser Sources II
Date: Sunday, February 8
Time: 11:30 AM - 11:50 AM
Paper 9348-8: Tailored bar concepts for 10mm-mrad fiber coupled modules scalable to kW-class direct diode lasers
Presenter: Dr. Andreas Unger
Direct diode lasers for materials processing in the kW power range are a highly active field of research and will potentially replace fiber lasers in applications like remote welding and sheet metal cutting. In this paper, laser modules based on newly developed tailored bars are presented. The modules allow efficient fiber coupling of more than 320 W into 10 mm-mrad or 160 W into 6 mm-mrad at one single wavelength. For further power scaling dense wavelength coupling concepts are presented which enable kW-class lasers with a beam quality of 10 mm-mrad.
Session 5: High Power Device Reliability
Date: Monday, February 9
Time: 9:00 AM - 9:20 AM
Paper 9348-22: High-power diode lasers under external optical feedback
Presenter: Dr. Heiko Kissel
In our paper, we will discuss the impact of optical feedback to filamentation amplitudes of single emitters with different reflectivity of the front facet coatings at several wavelengths in the spectral range between 780nm and 980nm. In addition to reversible modifications of external feedback to the device properties, we will consider irreversible impacts leading to gradual and sudden degradation including catastrophic optical damage (COD). Corresponding to the energy gap of GaAs, 870nm make the distinction in the absorption mechanisms of these diodes. We will compare the behavior of GaAs-based laser diodes with wavelengths below and above 870nm and discuss the differences.
Session 6: External Cavity Devices
Date, Monday, February 9
Time: 10:50 AM - 11:10 AM
Paper 9348-26: Wavelength stabilized multi-kW diode laser systems
Presenter: Dr. Bernd Köhler
Wavelength stabilization of high-power diode laser systems is an important means to increase the efficiency of diode pumped solid-state lasers. It also enables power scaling by dense wavelength multiplexing. We will present different wavelength stabilized diode laser systems with and without fiber coupling in the spectral range from 630 nm up to 1540 nm. The maximum output power of 2.7 kW was measured for a fiber coupled system (1000 µm, NA 0.22), which was stabilized at a wavelength of 969 nm with a spectral width of only 0.6 nm (90% value).
Session 7: High Power Devices III
Date: Monday, February 9
Time: 1:50 PM - 2:10 PM
Paper 9348-22: Progress in high-energy-class diode laser pump sources
Presenter: DILAS co-authored
High-energy-class solid-state lasers require higher power pumps for reduced cost and more efficient operation. We show how 940...980nm diode laser bars can deliver >1J/bar (1ms, 10Hz), triple that of conventional QCW bars, by using long (4...6mm) resonators and passivated facets. Results are presented for passively-cooled single bar assemblies and monolithic stacked arrays. We confirm that 1J/bar is sustained for stacked arrays with 1.7mm bar pitch, with narrow lateral far field and spectral width, showing a promising near-term path to use in real systems. Finally, we summarize status of bar optimization for higher efficiency, including studies into sub-zero operation temperatures (-65°C).
LASER World of PHOTONICS China
Visit booth, N3-3600 and discover new and innovative technologies by DILAS at LASER World of PHOTONICS China. This is China's platform for the photonics community - covering the full spectrum of the photonics industry, from components to manufacturing equipment as well as to comprehensive laser processing products and solutions will be presented.