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23 mJ high-power fiber CPA system using electro-optically controlled divided-pulse amplification

: Stark, H.; Buldt, J.; Müller, M.; Klenke, A.; Tünnermann, A.; Limpert, J.

Volltext ()

Optics Letters 44 (2019), Nr.22, S.5529-5532
ISSN: 0146-9592
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IOF ()

The pulse-energy scaling technique electro-optically controlled divided-pulse amplification is implemented in a high-power ultrafast fiber laser system based on coherent beam combination. A fiber-integrated front end and a multipass-cell-based back end allow for a small footprint and a modular implementation. Bursts of eight pulses are amplified parallel in up to 12 ytterbium-doped large-pitch fiber amplifiers. Subsequent spatiotemporal coherent combination of the 96 total amplified pulse replicas to a single pulse results in a pulse energy of 23 mJ at an average power of 674 W, compressible to a pulse duration of 235 fs. To the best of our knowledge, this is the highest pulse energy ever accomplished with a fiber chirped-pulse amplification (CPA) system.