The first attosecond pulse train reconstruction of high-order harmonics from laser ablation plasma

We present in this work the first attosecond pulse train reconstruction of high-order harmonics generated from plasma. We demonstrate that, as with gas medium, plasma medium can also be used to generate attosecond pulses in the extreme ultraviolet range. We generate harmonics from chromium plasma, with five harmonics between the 11^th to the 19^th order. By using the method of reconstruction of attosecond beating by interference of two-photon transitions (RABBIT), we characterize attosecond pulse trains with 300 as duration. This result shows that without using any synchronization method, the five harmonics we generate in chromium plasma had attosecond pulse duration.