325 Watts from 1-cm wide 9xx laser bars for DPSSL and FL applications

Norbert Lichtenstein; Yvonne Manz; Pascal Mauron; Arnaud Fily; Berthold E. Schmidt; Juergen Mueller; Sebastian Arlt; Stefan Weiss; Achim Thies; Joerg Troger; Christoph S. Harder

doi:10.1117/12.589560

17 March 2005 325 Watts from 1-cm wide 9xx laser bars for DPSSL and FL applications

Norbert Lichtenstein, Yvonne Manz, Pascal Mauron, Arnaud Fily, Berthold E. Schmidt, Juergen Mueller, Sebastian Arlt, Stefan Weiss, Achim Thies, Joerg Troger, Christoph S. Harder

Author Affiliations +

Proceedings Volume 5711, High-Power Diode Laser Technology and Applications III; (2005) https://doi.org/10.1117/12.589560
Event: Lasers and Applications in Science and Engineering, 2005, San Jose, California, United States

Abstract

Reliable power scaling by stretching the cavity length of the laser bars ranging from 1.2 mm to 3.6 mm at constant filling factor of 50% is demonstrated. While a relatively short cavity length of 1.2 mm allows for thermally limited CW output powers in excess of 180 W, extremely high 325 W at 420 A (CW, 16°C) have been achieved by leveraging the enhanced thermal properties of a 3.6 mm cavity length on standard micro-channel coolers. A high electro-optical conversion efficiency of 62% and 51% respectively is attributed to the low internal losses from an optimized waveguide design and the excellent properties of the AlGaAs-material system accounting for low thermal and electrical resistance. Multi-cell lifetest data at various operation conditions show extremely low wear-out rates even at harsh intermittent operation conditions (1-Hz type, 50% duty-cycle, 100% modulation). At 100 W output power 300 Mshots corresponding to 64000 h mean-time-to-failure (MTTF) have been extrapolated for 20% power drop from initial 2000 h and 4000 h lifetest readouts of a 1.2 mm cavity design. Similar results have been obtained for our next generation of ultra high power laser bars enabling reliable operation at 120 W output power and beyond. From 2.4 mm cavity length bars we have obtained 250 W of CW output power at 25°C while extrapolated reliability data at 120 W and 140 W power levels of up to 2000 h duration indicates that such devices are able to fulfill the requirements for lifetimes in the 20 - 30 kh range.

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Norbert Lichtenstein, Yvonne Manz, Pascal Mauron, Arnaud Fily, Berthold E. Schmidt, Juergen Mueller, Sebastian Arlt, Stefan Weiss, Achim Thies, Joerg Troger, and Christoph S. Harder "325 Watts from 1-cm wide 9xx laser bars for DPSSL and FL applications", Proc. SPIE 5711, High-Power Diode Laser Technology and Applications III, (17 March 2005); https://doi.org/10.1117/12.589560

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