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Determination Of Absolute Fringe Order In Hologram Interferometry With Wavelength Controlled Lasers

One problem in the quantitative evaluation of holographic interferograms is to measure the absolute fringe order and not only the relative one. This relative fringe order can be measured with high accuracy by means of methods like heterodyning or phase shifting. To get the absolute value a method using two different wavelength to perform the interferograms. The mathematical treatment and an experimental application is reported.