title: Observation of spontaneous polarization misalignments in periodically poled crystals using second-harmonic generation microscopy.
abstract: Periodically poled crystal (PPC) is a key component for nonlinear optical applications. Its poling quality relies largely on successful domain inversion and the alignment of spontaneous polarization (SP) vectors in each domain. Here we report the unexpected observation of bulk second harmonic generation (SHG) in PPC when excitation propagating along its optical axis. Based on its tensorial nature, SHG is highly sensitive to the orientation of SP, and therefore the misalignment of SP in each domain of PPC can be revealed noninvasively by SHG microscopy. This nonlinear imaging modality provides optical sectioning capability with 3D sub-micrometer resolution, so it will be useful for in situ investigation of poling quality in PPC.
authors.affiliation: Department of Physics, National Taiwan University, Taipei, Taiwan.
authors.forename: Yu-Yi
authors.initials: YY
authors.lastname: Tzeng
authors.forename: Zong-Yan
authors.initials: ZY
authors.lastname: Zhuo
authors.forename: Ming-Yin
authors.initials: MY
authors.lastname: Lee
authors.forename: Chien-Sheng
authors.initials: CS
authors.lastname: Liao
authors.forename: Pei-Chun
authors.initials: PC
authors.lastname: Wu
authors.forename: Chin-Jie
authors.initials: CJ
authors.lastname: Huang
authors.forename: Ming-Che
authors.initials: MC
authors.lastname: Chan
authors.forename: Tzu-Ming
authors.initials: TM
authors.lastname: Liu
authors.forename: Yen-Yin
authors.initials: YY
authors.lastname: Lin
authors.forename: Shi-Wei
authors.initials: SW
authors.lastname: Chu