Line Plot from Scientific Research

Diagram of the charge distribution with respect to the phase of two optical signals along the propagation direction. The net space-charge accumulation is proportional to the phase difference between two optical frequencies ( ϕ 2 ω − 2 ϕ ω ). This space-charge distribution and the resulting electric field quasi-phase-match the momentum difference for SHG. Scale bar, 5 mm.

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