Performance demonstration of the PEnELOPE main amplifier HEPA I using broadband nanosecond pulses. (2019)

• Record Type: Journal Article
• Authors: Albach, D.; Loeser, M.; Siebold, M.; Schramm, U.
• Is Part Of: High power laser science and engineering. Volume 7(2019)
• Publication Date: 2019
• Subjects: diode-pumped lasers, -- laser amplifiers, -- laser diagnostics, -- pulse energy, -- ytterbium; High power lasers -- Periodicals; 621.366
• DOI: 10.1017/hpl.2018.59
• Languages: English
• ISSNs: 2095-4719

Abstract

Abstract : We report on the energetic and beam quality performance of the second to the last main amplifier section HEPA I of the PEn ELOPE 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 continuous wave 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.