The paper discusses the methods of high-speed imaging of high-temperature processes in a real time mode: passive registration in the own light, usage of laser illumination, and using the laser monitor. The visualization results of combustion in air of Al nanopowder and thermite Al-Fe2O3 mixture are presented. The perspectives of application of laser monitors in NDE are considered, particularly for the study of laser ignition of thermite mixtures and solid fuels.