LASER HOLOGRAPHIC-INTERFEROMETRY FOR INVESTIGATIONS OF CYLINDRICAL TRANSPARENT TUBES

A new double differential refractometer for student laboratories, base d on holographic interferometry in real time with reference hologram a nd reference fringes, is presented. By studying the interferograms one gets a graphical record of the radial, axial, and temporal distributi on of the refraction index in cylindrical tubes. This method permits t he determination of the experimental parameters for cases when the rel ationship between these parameters and the refraction index is known. The paper presents experimental results for gas-discharge parameters. (C) 1996 Society of Photo-Optical instrumentation Engineers.