Subnanometer absolute measurements by means of mixed synthetic-optical homodyne interferometer

Marco Pisani & Massimo Zucco
A possible technique to measure absolute distances is presented. It is based on a Michelson interferometer where two tuneable lasers are superposed to create a very short synthetic wavelength. By exploiting relative and absolute interferometry theories merged together in a demonstrator experiment we have shown the possibility of absolute distance measurements with sub-fringe resolution.
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