Physics – Optics
Scientific paper
2007-06-21
Phys.Rev.Lett. 100, 063902 (2008)
Physics
Optics
15 pages, 3 figures
Scientific paper
10.1103/PhysRevLett.100.063902
The wave-front engineering for nonlinear optical interactions was discussed. Using Huygens-Fresnel principle we developed a general theory and technique for domain engineering with conventional quasi-phase-matching structures being the special cases. By Fourier analysis we put forward the concept of local quasi-phase matching, which suggests that the quasi-phase matching is fulfilled only locally not globally. Experiments on focal effect of second-harmonic wave agreed well with the theoretical prediction. The proposed scheme combines three optical functions: generation, focusing and beam splitting of second-harmonic wave, thus making the device more compact. Further the proposed scheme can be used to perform the integration of multi-functional optical properties in nonlinear photonics, as well as expand the use of nonlinear optical devices.
Qin Yi-qiang
Zhang Chao
Zhu Yong-yuan
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