A fundamental theoretical investigation of laser ignition is reported. Ignition is happened in an explosion bomb which equipped with visualization windows and all aspects of the phenomenon such as plasmas, shock waves, ignition kernels, and propagating flames are observed by high-speed schlieren photography. The study covers different phases of laser ignition with theoretical interpretations in chronological order, consisting of electrical breakdown and energy transfer from laser to plasma, shock-wave generation and propagation, gasdynamic effects and generation of the third lobe, chemical induction and ignition and turbulent flame initiation.