Evolution of vortices created by conical diffraction in biaxial crystals versus orbital angular momentum

• URL: http://arxiv.org/abs/2010.13425v1
• Date: Mon, 26 Oct 2020 08:49:10 GMT
• Title: Evolution of vortices created by conical diffraction in biaxial crystals versus orbital angular momentum
• Authors: A Brenier (UCBL)
• Abstract summary: Experimental results are provided by a non-degenerate cascade of KGd(WO$$)$_4$ and Bi$$$ZnOB$axial$O$_6$ bi crystals. The phase of the state light and its vortices were visualized by interference patterns with a reference beam.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Light states evolution versus their fractional orbital angular momentum (OAM) has been analyzed in the conical diffraction process occurring through biaxial crystals. Experimental results are provided by a non-degenerate cascade of KGd(WO$_2$)$_4$ and Bi$_2$ZnOB$_2$O$_6$ biaxial crystals. The continuous $0\to 1\to 2$ $\hbar$/photon increasing of the fractional OAM in passing through integer values was operated with the help of the spin-orbit coupling in the Bi$_2$ZnOB$_2$O$_6$ crystal. The phase of the state light and its vortices were visualized by interference patterns with a reference beam. The evolution of the fractional OAM value is accompanied by a continuous evolution of pairs of vortices with opposite signs and linked by a $-\pi/+\pi$ discontinuous phase line. The phase pattern evolution around half-integer OAM is observed to be continuous. In other cases, the evolution can be interrupted by the breaking of a $-\pi/+\pi$ discontinuous phase line and a new pair of vortices with opposite charges is born.

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