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26 February 2018 Fully integrated Q-switch for commercial high-power resonator with solitary XLMA-fiber
R. Lange, C. Bachert, G. Rehmann, H. Weber, R. Luxen, H. Enns, M. Schenk, S. Hosdorf, S. Marfels, M. Bay, A. Kösters, V. Krause, M. Giesberts, O. Fitzau, H.-D. Hoffmann
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Proceedings Volume 10512, Fiber Lasers XV: Technology and Systems; 1051217 (2018) https://doi.org/10.1117/12.2288309
Event: SPIE LASE, 2018, San Francisco, California, United States
Abstract
In surface processing applications the correlation of laser power to processing speed demands a further enhancement of the performance of short-pulsed laser sources with respect to the investment costs. The frequently applied concept of master oscillator power amplifier relies on a complex structure, parts of which are highly sensitive to back reflected amplified radiation. Aiming for a simpler, robust source using only a single ytterbium doped XLMA fiber in a q-switched resonator appears as promising design approach eliminating the need for subsequent amplification. This concept requires a high power-tolerant resonator which is provided by the multikilowatt laser platform of Laserline including directly water-cooled active fiber thermal management.

Laserline GmbH and Fraunhofer Institute for Laser Technology joined their forces1 to upgrade standard high power laser sources for short-pulsed operation exceeding 1 kW of average power. Therefor a compact, modular qswitch has been developed.

In this paper the implementation of a polarization independent q-switch into an off-the-shelf multi-kilowatt diodepumped continuous wave fiber source is shown. In this early step of implementation we demonstrated more than 1000 W of average power at pulse lengths below 50 ns FWHM and 7.5 mJ pulse energy. The M2 corresponds to 9.5. Reliability of the system is demonstrated based on measurements including temperature and stability records. We investigated the variation possibilities concerning pulse parameters and shape as well as upcoming challenges in power up-scaling.
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R. Lange, C. Bachert, G. Rehmann, H. Weber, R. Luxen, H. Enns, M. Schenk, S. Hosdorf, S. Marfels, M. Bay, A. Kösters, V. Krause, M. Giesberts, O. Fitzau, and H.-D. Hoffmann "Fully integrated Q-switch for commercial high-power resonator with solitary XLMA-fiber", Proc. SPIE 10512, Fiber Lasers XV: Technology and Systems, 1051217 (26 February 2018); https://doi.org/10.1117/12.2288309
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KEYWORDS
Q switching
Resonators
Fiber lasers
Laser applications
Pulsed laser operation
Laser processing
Q switched lasers
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