Abstract
When optical wave propagates through an inhomogeneous medium the finite number of points occurrence is possible, where irradiance intensity equals to zero as consequence of partial waves interference.2 The phase of the wave cannot be defined in these points and in their vicinity the phase surface can be described either as a multilist, three-dimensional surface or as a broken two-dimensional surface. In the last case the branch cuts connect the pairs of the screw dislocations with opposite sign.4
© 1994 IEEE
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