Phys. Rev. Lett. 88, 083901 (2002) [4 pages]Hidden Coherence Along Space-Time Trajectories in Parametric Wave MixingReceived 24 September 2001; published 5 February 2002 We show theoretically that the waves generated through the generic parametric three- or four-wave-mixing processes exhibit, as a general rule, a hidden coherence characterized by skewed coherence lines along specific space-time trajectories. Our study generalizes the concept of coherence in the sense that these previously unrecognized coherent states cannot be described through the standard definitions of spatial and temporal coherence. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.083901
DOI:
10.1103/PhysRevLett.88.083901
PACS:
42.65.Sf, 42.50.Ar, 42.25.Kb, 42.65.Yj
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