This volume presents the recent progress and perspective in multi-photon processes and spectroscopy of atoms, ions, molecules and solids. The subjects in the series cover the experimental and theoretical investigations in the interdisciplinary research fields of natural science including chemistry, physics, bioscience and material science.This series is a pioneer in the review of nonlinear interactions of photon and matter, and has made an essential contribution to development and promotion of the related research fields. In view of the rapid growth in multi-photon processes and multi-photon...