By using two phase conjugate reflectors a dynamic interferometric system has been constructed which can sequentially measure differential changes in an object at short intervals. Holograms are recorded in two BSO crystals; one of them is used as an optical storage medium for a 2-D optical field to obtain a delayed phase conjugated wavefront and the other is used for the current wavefront. The phase conjugated wavefronts are generated sequentially, so that only interferograms of changes in optical phase shift with time are extracted. From the detected interferogram the amount of change of the desired parameter is derived and it is displayed in 3-D. The construction of the device and some measurement results are given.
© 1988 Optical Society of America
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