Coles Matt M, Williams Mathew D, Andrews David L
School of Chemistry, University of East Anglia, Norwich NR4 7TJ, UK.
Opt Express. 2013 May 20;21(10):12783-9. doi: 10.1364/OE.21.012783.
Optical vortex light can be up-converted into a second harmonic output in an isotropic medium, in which such conversion is normally forbidden, through six-wave mixing. The involvement of orbital angular momentum is tackled for the case of a Laguerre-Gaussian pump comprising l = 1 photons. By calculating quantum amplitudes for the emergent radiation states, utilizing a state-sequence method, the analysis identifies the characteristics of the emission and an entangled distribution of conserved orbital momentum. A distinctive conical spread affords a potential means of resolving the individual angular momentum content.
