Generation and characterisation of few-pulse attosecond pulse trains at 100 kHz repetition rate
Mikhail Osolodkov, Federico J Furch, Felix Schell, Peter Šušnjar, Fabio Cavalcante, Carmen S Menoni, Claus P Schulz, Tobias Witting, Marc J J Vrakking
Abstract
Abstract The development of attosecond pump–probe experiments at high repetition rate requires the development of novel attosecond sources maintaining a sufficient number of photons per pulse. We use 7 fs, 800 nm pulses from a non-collinear optical parametric chirped pulse amplification laser system to generate few-pulse attosecond pulse trains (APTs) with a flux of >10 6 photons per shot in the extreme ultraviolet at a repetition rate of 100 kHz. The pulse trains have been fully characterised by recording frequency-resolved optical gating for complete reconstruction of attosecond bursts (FROG-CRAB) traces with a velocity map imaging spectrometer. For the pulse retrieval from the FROG-CRAB trace a new ensemble retrieval algorithm has been employed that enables the reconstruction of the shape of the APTs in the presence of carrier envelope phase fluctuations of the few-cycle laser system.