Abstract
This study shows that the principle of a recently proposed common-path laser
interferometer containing a planar grating is nonexistent and apparently caused by a mathematical
derivation error. Both p- and s-polarized beams in the proposed setup experience once the +1st-order
diffraction and once the -1st-order diffraction by the grating. As a result, the phase of each beam
remains unchanged and the interference fringes formed by the two beams are not expected to move when
the grating is translated in the grating vector direction. We perform an experiment to confirm this
prediction. Both our analysis and experimental observation cast doubt on the experimental results of
the authors who proposed the interferometer.
© 2012 Chinese Optics Letters
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