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As Ultrafast laser technology advances towards ever higher peak and averagepowers, generating sub-50 fs pulses from laser architectures that exhibit bestpower-scaling capabilities remains a major challenge. Here, we present a verycompact and highly robust method to compress 1.24 ps pulses to 39 fs by meansof only a single spectral broadening stage which neither requires vacuum partsnor custom-made optics. Our approach is based on the hybridization of themulti-plate continuum and the multi-pass cell spectral broadening techniques.Their combination leads to significantly higher spectral broadening factors inbulk material than what has been reported from either method alone. Moreover,our approach efficiently suppresses adverse features of single-pass bulkspectral broadening. We use a burst mode Yb:YAG laser emitting pulses with 80MW peak power that are enhanced to more than 1 GW after post-compression. Withonly 0.19 % rms pulse-to-pulse energy fluctuations, the technique exhibitsexcellent stability. Furthermore, we have measured state-of-the-artspectral-spatial homogeneity and good beam quality of M$^2 = 1.2$ up to aspectral broadening factor of 30. Due to the method's simplicity, compactnessand scalability, it is highly attractive for turning a high-power picosecondlaser into an ultrafast light source that generates pulses of only a few tensof femtoseconds duration.

Factor 30 pulse compression by hybrid multi-pass multi-plate spectral broadening