193 / 2023-04-15 18:04:51

Coherent control of atomic inner-shell x-ray lasing via perturbed valence-shell transitions

atomic inner-shell x-ray lasing,Stark modulation,sidebands and attosecond pulses at x-ray region

极端光下的基础物理学 > 基础物理-I

The commissioning of x-ray free electron laser facilities and the development of x-ray optical devices have enabled new techniques and opportunities in x-ray science. Atomic inner-shell x-ray lasers pumped by an x-ray free-electron laser generate ultrashort, intense, monochromatic pulses with temporal coherence. It has been verified that sub-cycle Stark shifts by infrared field can produce the highly efficient temporal and spectral modulations on x-ray scattering^[4]. In this work, coherent control of atomic inner-shell x-ray lasing in monovalent magnesium ions is investigated theoretically, where valence-shell transitions are driven by optical lasers. Modulated high-order sidebands and attosecond pulses are generated with quasi-continuous-wave and few-cycle control lasers, respectively. The general manipulation scheme involves fast Auger decay, limited pump coherence, diverse coupling channels, and collisions in the plasma. Our approach shows potential applications in high-resolution spectroscopy, nonlinear x-ray studies, metrology, and ultrafast science in keV regime.