Noncolinear Second-Harmonic Generation Pairs and Their Scatterings in Nd$^{3+}$:SBN Crystals with Needle-Like Ferroelectric Domains
Tian-Run Feng1, Hui-Zhen Kang2, Lei Feng1, Jia Yang2, Tian-Hao Zhang1**, Feng Song1, Jing-Jun Xu1, Jian-Guo Tian1, L. I. Ivleva3
1Photonics Research Center, School of Physics, The MOE Key Lab of Weak-Light Nonlinear Photonics, and Tianjin Key Lab of Photonics Materials and Technology for Information Science, Nankai University, Tianjin 300071 2Basic Department of Military Transportation College, Tianjin 300161 3Institute for General Physics of the Russian Academy of Science, Moscow 119991, Russia
Abstract：Second-harmonic generation in Nd$^{3+}$:SBN crystal with needle-like ferroelectric with aperiodic domain structures is investigated. Two pairs of second harmonic (SH) waves appearing in lines are observed in unpoled Nd$^{3+}$:SBN crystals with aperiodic needle-like domains. A pair of SH waves emit from the exit face, whose intensities are angle-dependent. The angular dependence is corresponding to the spatial frequency spectrum of the aperiodic domain structure. Another pair of SH waves emit from both the side surfaces, which are mainly the scattered SH waves by needle-like domain walls and obey the theory of Rayleigh scattering.
2018, Vol. 35 
