Coherent beam combining of high power quasi continuous wave tapered amplifiers

P. Albrodt1, M. Niemeyer2, P. Crump2, J. Hamperl1, F. Moron1, P. Georges1, and G. Lucas-Leclin1

Published in:

Opt. Express, vol. 27, no. 20, pp. 27891-27901 (2019).

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Abstract:

We demonstrate coherent beam combining of four high brightness tapered amplifiers in pulsed, quasi continuous wave (QCW) operation, seeded by a 976 nm laser diode. The maximum power of 22.7 W was achieved with > 64% combining efficiency in a close to diffraction limited beam. We discuss turn-on dynamics of tapered amplifiers operated in pulsed mode in detail.

1 Laboratoire Charles Fabry, Institut d’Optique Graduate School, CNRS, Université Paris Saclay, Avenue Augustin-Fresnel, 91127 Palaiseau, France
2 Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, 12489 Berlin, Germany