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[CrossRef]

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[CrossRef]

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[CrossRef]

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[CrossRef]

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[CrossRef]

Y. J. Ding and J. B. Khurgin, "Backward optical parametric oscillators and amplifiers," IEEE J. Quantum Electron. 32, 1574-1582 (1996).

[CrossRef]

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[CrossRef]

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[CrossRef]

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[CrossRef]

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[CrossRef]

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[CrossRef]
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[CrossRef]

P. Kinsler, S. B. P. Radnor, and G. H. C. New, "Theory of directional pulse propagation," Phys. Rev. A 72, 063807 (2005).

[CrossRef]

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[CrossRef]

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[CrossRef]

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[CrossRef]

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If the forward field has a wave vector k0 and evolves as exp(+ik0z), the generated backward component will evolve as exp(−ik0z). This gives a very rapid relative oscillation exp(−2ik0z), which will quickly average to zero.