Generation and characterization of few-pulse attosecond pulse trains at 100kHz repetition rate

Abstract

Many experiments in attosecond science will benefit from attosecond pulses at high repetition rates with sufficient photon flux for pump-probe experiments. We use 7 fs, 800 nm pulses from a non-collinear optical parametric chirped pulse amplification (NOPCPA) laser system to generate few-pulse attosecond pulse trains (APTs) in the extreme ultraviolet (XUV) at a repetition rate of 100 kHz. The pulse trains have been fully characterized by recording FROG-CRAB (Frequency-Resolved Optical Gating for Complete Reconstruction of Attosecond Bursts) traces with a velocity map imaging spectrometer.

Attosecond pulse generation at ELI-ALPS 100 kHz repetition rate beamline

“…We generated lower pulse energy (∼9 pJ) than what is reported in Rothhardt's work (∼23 pJ) [45], however, we deliverred higher pulse energy to the target area. Only the work of Osolodkov et al [51] and this work from the ones listed in figure 1 reported the durations of the high-order harmonic pulses, thus confirming the generation of attosecond pulses.…”

“…However, because of the oxidation the measured attenuation is ∼70%. Until now, this has been the lowest attenuation from generation to the target for high-order harmonics driven by a laser of high repetition rate and high average power (∼100 W) [45,51]. When an un-oxidized Al filter is used, an attenuation as low as ∼21% is expected from generation to target.…”

“…Hammerland et al [104] transported their beamline to ELI-ALPS and measured the duration of the attosecond pulse train in the presence of interfering dressing fields using the HR-1 laser (fiber-CPA) of ELI-ALPS. Osolodkov et al [51] used OPCPA to generate few-pulse attosecond pulse trains and used SiO 2 plates [78] and metal filter to attenuate the driving laser.…”