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A novel mechanism of efficient second harmonic generation in domain wallseries is reported. By employing angle modulation, obvious intensity peaks ofsecond harmonic appear at specific incident angles utilizing the continuouslaser source of 200mW, and the single-pass conversion efficiency comes up to5%/W only through dozens of domain walls. It can be shown that the phenomenonis caused by coherent superposition of Cherenkov second harmonics (CSH)generated by different domain walls, which is a novel mechanism totallydistinguished from Quasi-phase-matching (QPM).

Coherently superposed efficient second harmonic generation by domain wall series in ferroelectrics