Progress in joule-class diode laser bars and high brightness modules for application in long-pulse pumping of solid state amplifiers

P. Crumpa,M.M. Karowa, S. Kniggea, A. Maaßdorfa, G. Tränklea, J. Lotzb, W. Fassbenderb, J. Neukumb, J. Körnerc, R. Bödefeldc and J. Heinc

Published in:

Proc. SPIE 10086, Photonics West, San Francisco, USA, Jan 28 - Feb 02, 100860E (2017).

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Abstract:

Progress in the development of highly brilliant pump modules based on novel high-energy-class diode laser bars is presented, targeting long-pulse (2 ms) application in pumping Yb:CaF2 amplifier crystals. Bars with long resonators and high fill factors are used for low resistance and efficient cooling. Advanced extreme-double asymmetric epitaxial structures are used for high efficiency at high power. Facet passivation is used for long life at high powers, enabling operation at 600 W per bar (1.2 J). Performance of bars and passively cooled stacks is summarized and prospects for further performance enhancements are reviewed.

a Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, 12489 Berlin, Germany
b DILAS Diodenlaser GmbH, Galileo-Galilei-Str. 10, 55129 Mainz, Germany
c Lastronics GmbH, Winzerlaer-Str. 2, 07745 Jena, Germany

Keywords:

diode laser, pump sources, bars, joule-class, high efficiency, monolithic stacked arrays.