Speaker
Description
Attosecond science with XFELs is a rapidly growing field. Nearly half of soft X-ray LCLS user experiments now use attosecond pulses. In this talk, I will present recent advances in the generation and characterization of attosecond pulses at the LCLS and LCLS-II, focusing on three main topics:
1. First direct observation of attosecond pulses in the hard X-ray domain.
2. Attosecond lasing in a high repetition rate, CW superconducting accelerator.
3. Spectrotemporal shaping techniques for attosecond XFEL pulses.
On the first point, I will show results from two different experiments demonstrating 9 keV pulses with sub-400-as duration, with direct measurements enabled by recent advances in broadband hard X-ray optics. I will then show the first attosecond soft X-ray lasing results from the LCLS-II at 16 kHz with pulse duration measurements using angular streaking in a circular time of flight spectrometer array. Extending on that, I’ll present two different techniques for shaping the spectrotemporal structure of attosecond pulses, highlighting experimental evidence from the LCLS-II of coherent attosecond pulse pairs and trains with tunable color separations, time delays, and relative phases. Altogether, these results open the doors to (1) attosecond scattering experiments and electronic-damage-free measurements, (2) the full realization of attosecond pump attosecond probe spectroscopy, and (3) attosecond coherent control in the X-ray domain.
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