Three orders of magnitude two-beam-coupling gain increase from Cu-doped (K0.5Na0.5)0.2(Sr0.75Ba0.25)0.9Nb2O6 crystal owing to huge depolarization field-induced surface metallization
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Eur. Phys. J. Plus, 137 2 (2022) 220
Published online: 10 February 2022
DOI: 10.1140/epjp/s13360-022-02402-6