Spatial quantum noise in singly resonant second-harmonic generation.
We study the spatial distribution of quantum noise in singly resonant second-harmonic generation. Calculations are performed below threshold for spatial modulational instability. For parameters for which the intracavity fields are modulationally stable the spatial spectrum shows maximum squeezing at k=0, whereas under conditions of modulational instability we find maximum squeezing at finite wave number |k|=k(c), where k(c) corresponds to the classical critical wave number.
Lodahl
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Saffman
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