Attosecond soft X-ray high harmonic generation
Attosecond soft X-ray high harmonic generation is a scholarly work by Allan S. Johnson, published in 2019 in ''Philosophical Transactions of the Royal Society A''. The main subjects of the publication include high harmonic generation, laser, femtosecond, Water window, Ultrashort pulse, extreme ultraviolet, mass spectrometry, optics, physics, attophysics, and attosecond. High harmonic generation (HHG) of an intense laser pulse is a highly nonlinear optical phenomenon that provides the only proven source of tabletop attosecond pulses, and it is the key technology in attosecond science.