Introduction to the Issue on Attosecond Photonics

The eleven papers in this special section provide an overview of the status of research and development in the field of attosecond photonics They introduce new trend in driving laser and attosecond source advancement such as light wave synthesis, long wavelength few-cycle optical parametric amplifiers, and high harmonic generation in solids. Several important topics in theoretical and experimental studies of ionization dynamics induced by both strong infrared laser and attosecond pulses are covered.