Interference patterns obtained from the biased p-shifted Michelson interferometer in the case of a second crystal with rotateable axes used as DUT. Authors propose a biased p-shifted Michelson interferometer where a birefringent crystal is inserted in front of the interferometer to introduce a bias differential group delay larger than the coherence time of the source. [See article by Simova et al. Fig. 4 for details.]
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