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Direct compression of 170-fs 50-cycle pulses down to 1.5 cycles with 70% transmission

: Jeong, Y.-G.; Piccoli, R.; Ferachou, D.; Cardin, V.; Chini, M.; Hädrich, S.; Limpert, J.; Morandotti, R.; Legare, F.; Schmidt, B.E.; Razzari, L.

Volltext ()

Scientific Reports 8 (2018), Art. 11794, 6 S.
ISSN: 2045-2322
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IOF ()

We present a straightforward route for extreme pulse compression, which relies on moderately driving self-phase modulation (SPM) over an extended propagation distance. This avoids that other detrimental nonlinear mechanisms take over and deteriorate the SPM process. The long propagation is obtained by means of a hollow-core fiber (HCF), up to 6 m in length. This concept is potentially scalable to TW pulse peak powers at kW average power level. As a proof of concept, we demonstrate 33-fold pulse compression of a 1 mJ, 6 kHz, 170 fs Yb laser down to 5.1 fs (1.5 cycles at 1030 nm), by employing a single HCF and subsequent chirped mirrors with an overall transmission of 70%.