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1 PublicationPerformance demonstration of the PEnELOPE main amplifier HEPA I using broadband nanosecond pulses
Albach, D.; Loeser, M.; Siebold, M.; Schramm, U.
Abstract
We report on the energetic and beam quality performance of the second to the last main amplifier section HEPA I of the PEnELOPE laser project. A polarization coupled double-12-pass scheme to verify the full amplification capacity of the last two amplifiers HEPA~I and II was used. The small signal gain for a narrow band cw laser was 900 and 527 for a broadband nanosecond pulse, demonstrating 12.6 J of output pulse energy. Those pulses, being spectrally wide enough to support equivalent 150 fs long ultrashort pulses, are shown with an excellent spatial beam quality. A first active correction of the wavefront using a deformable mirror resulted in a Strehl ratio of 76 % in the single-12-pass configuration for HEPA I.
Keywords: Diode-pumped lasers; ytterbium; laser amplifiers; laser diagnostics; pulse energy
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High Power Laser Science and Engineering 7(2018), e1
DOI: 10.1017/hpl.2018.59
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Permalink: https://www.hzdr.de/publications/Publ-27274