Phys. Rev. A 66, 023807 (2002) [5 pages]Twin beams, nonlinearity, and walk-off in optical parametric oscillatorsReceived 10 November 2001; published 8 August 2002 We study the quantum properties of the spatially tilted macroscopic signal beams in the transverse pattern formed in a degenerate optical parametric oscillator above threshold. We show that walk-off leads to an imbalance in the intensities and fluctuations of these beams when nonlinear multimode interactions are effective. Still, quantum correlations between the two beams are preserved, so that their intensity difference exhibits sub-Poissonian statistics. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.66.023807
DOI:
10.1103/PhysRevA.66.023807
PACS:
42.50.Dv, 42.65.Sf, 42.50.Ct
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