Noncritically squeezed light via spontaneous rotational symmetry breaking.

@article{NavarreteBenlloch2007NoncriticallySL,
  title={Noncritically squeezed light via spontaneous rotational symmetry breaking.},
  author={Carlos Navarrete-Benlloch and Eugenio Rold{\'a}n and Germ{\'a}n J. de Valc{\'a}rcel},
  journal={Physical review letters},
  year={2007},
  volume={100 20},
  pages={
          203601
        }
}
We predict squeezed light generation through the spontaneous rotational symmetry breaking occurring in a degenerate optical parametric oscillator (DOPO) pumped above threshold. We show, within the linearized theory, that a DOPO with spherical mirrors, in which the signal and idler fields correspond to first-order Laguerre-Gauss modes, produces a perfectly squeezed vacuum with the shape of a Hermite-Gauss mode. This occurs at any pumping level above threshold; hence, the phenomenon is… 
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