Topological charge algebra of optical vortices in nonlinear interactions.
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We investigate the transfer of orbital angular momentum among multiple beams involved in a coherent Raman interaction. We use a liquid crystal light modulator to shape pump and Stokes beams into optical vortices with various integer values of topological charge, and cross them in a Raman-active crystal to produce multiple Stokes and anti-Stokes sidebands. We measure the resultant vortex charges using a tilted-lens technique. We verify that in every case the generated beams' topological charges obey a simple relationship, resulting from angular momentum conservation for created and annihilated photons, or equivalently, from phase-matching considerations for multiple interacting beams.
author list (cited authors)
Zhdanova, A. A., Shutova, M., Bahari, A., Zhi, M., & Sokolov, A. V.
complete list of authors
Zhdanova, Alexandra A||Shutova, Mariia||Bahari, Aysan||Zhi, Miaochan||Sokolov, Alexei V