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Optical investigation of fast processes with new pulsed monochrome light source

The emergence of lasers opened a new epoch in optical diagnostics of fast processes in many fields and in gasdynamics in particular (holography, holographic and speckle interferometry, etc.). However, as to classical optical methods traditionally applied in gasdynamics, these new light sources, side by side with numerous advantages, have a certain demerit. High spatial coherency of a laser beam leads to appearance of speckle structure in an image obtained with the help of interferometers or schlieren devices, which can not be eliminated even with scatterer application. A new semiconductor laser with electron-beam pumping is free from such a demerit. Its quality and capabilities are illustrated by flow pattern obtained at an experiment of gasdynamics, ballistics, laser plasma diagnostics.