  The requirement of high space-time resolution and brightness is a great
challenge for imaging atomic motion and making molecular movies. Important
breakthroughs in ultrabright tabletop laser, x-ray and electron sources have
enabled the direct imaging of evolving molecular structures in chemical
processes. And recent experimental advances in preparing ultrafast laser and
electron pulses equipped molecular imaging with femtosecond time resolution.
This Perspectives present an overview of versatile imaging methods of molecular
dynamics. High-order harmonic generation imaging and photoelectron diffraction
imaging are based on laser-induced ionization and rescattering processes.
Coulomb explosion imaging retrieves molecular structural information by
detecting the momentum vectors of fragmented ions. Diffraction imaging encodes
molecular structural and electronic information in reciprocal space. We also
present various applications of these ultrafast imaging methods in resolving
laser-induced nuclear and electronic dynamics.
