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期刊论文
Conical Second Harmonic Generation in a Two-Dimensional x(2) Photonic Crystal: A Hexagonally Poled LiTaO3 Crystal
PHYSICAL REVIEW LETTERS, 2004, 93 (13): 133904-01～133904-04，-0001，（）：
A new type of conical second-harmonic generation was discovered in a 2D X(2) photonic crystal—a hexagonally poled LiTaO3 crystal. It reveals the presence of another type of nonlinear interaction—a scattering involved optical parametric generation in a nonlinear medium. Such a nonlinear interaction can be significantly enlarged in a modulated X(2) structure by a quasi-phase-matching process. The conical beam records the spatial distribution of the scattering signal and discloses the structure information and symmetry of the 2D X(2) photonic crystal.
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