title: Second-harmonic imaging from a modulated domain structure.
abstract: We present a new second-harmonic (SH) imaging technique to study the domains in a hexagonally poled LiTaO(3) nonlinear photonic crystal by using a femtosecond laser. By detecting the SH images at different planes, the distribution of the 180 degrees -inverted ferroelectric domains can be characterized, and the contributions of different nonlinear tensor components, modulated differently in the domain structure, can be selectively determined. Fundamental understanding and potential applications of such SH imaging techniques for the inverted nonlinear domain structures are presented and discussed.
authors.affiliation: National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University,Nanjing 210093, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhang
authors.forename: Fuming
authors.initials: F
authors.lastname: Wang
authors.forename: Katrina
authors.initials: K
authors.lastname: Geren
authors.forename: S N
authors.initials: SN
authors.lastname: Zhu
authors.forename: Min
authors.initials: M
authors.lastname: Xiao