Self-compression of millijoule pulses to 78 fs duration in a white-light filament

TLDR

The study introduces a novel technique to compress few‑millijoule pulses to sub‑10‑fs durations. The method uses spectral broadening in a noble‑gas white‑light filament to achieve compression. Self‑compression in the filament reduced 45‑fs pulses to below 8‑fs, delivering up to 3.8‑mJ pulses with peak powers exceeding 100 GW at kilohertz rates, outperforming earlier schemes.

Abstract

We demonstrate a novel technique for pulse compression of few-millijoule pulses with shorter than 10 fs duration. Our technique relies on spectral broadening in a white-light filament generated in a noble gas. In this filament we observe self-compression of 45 fs pulses down to below 8 fs duration without the need for any additional dispersion compensation. Using input pulses of 5 mJ, we generate compressed pulses with up to 3.8 mJ pulse energy. Therefore this method is much more efficient than previously demonstrated compression schemes. The generated peak powers of more than 100 GW at a kilohertz repetition rate open up a perspective for compression of few-cycle pulses with energies well beyond the capacity of hollow-fiber compressors.