Coherent beam combining of high power quasi continuous wave tapered amplifiers

P. Albrodt (1) , M. Niemeyer (2) , P. Crump (2) , J. Hamperl (1) , F. Moron (1) , Patrick Georges (1) , Gaëlle Lucas-Leclin (1)

1 Laboratoire Charles Fabry / Lasers
2 FBH - Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik

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.

Domaines: Optique [physics.optics]; Optique / photonique

P. Albrodt, M. Niemeyer, P. Crump, J. Hamperl, F. Moron, et al.. Coherent beam combining of high power quasi continuous wave tapered amplifiers. Optics Express, 2019, 27 (20), pp.27891. ⟨10.1364/OE.27.027891⟩. ⟨hal-02332526⟩