Novel method for CEP-stable seeding of few-cycle OPCPAs

Cirmi, Giovanni; Çankaya, Hüseyin; Krogen, Peter; Calendron, Anne-Laure; Hua, Yi; Debord, Benoît; Gérôme, Frédéric; Benabid, Fetah; Kärtner, Franz X.

doi:10.1364/assl.2019.am2a.3

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2020

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“…In a first experiment (setup scheme in Fig. 1), we used 308 µJ of the total pump laser energy at 1 kHz repetition rate [31]. We generated the seed by focusing a 13-µJ fraction of the driving laser output into a 10-mm-long YAG crystal.…”

Section: 'Narrowband' Opamentioning

confidence: 99%

Novel method for the angular chirp compensation of passively CEP-stable few-cycle pulses

Cirmi¹,

Çankaya²,

Krogen³

et al. 2020

Opt. Express

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We demonstrate a novel, energy-efficient, cost-effective simple method for seeding CEP-stable OPCPAs. We couple the CEP-stable idler of a broadband OPCPA into a hollow core Kagome fiber thus compensating for the angular chirp. We obtain either relatively narrow bandwidths with ∼36% coupling efficiency or quarter-octave spanning bandwidths with ∼2.2% coupling efficiency. We demonstrate spectral compressibility, good beam quality and CEP stability. Our source is an ideal seed for high-energy, high-average power, CEP-stable few-cycle OPCPA pulses around 2 µm, which can drive the generation of coherent soft X-ray radiation in the water window spectral region via HHG.

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Section: 'Narrowband' Opamentioning

confidence: 99%