title: Polarization-free second-order nonlinear frequency conversion using the optical superlattice.
abstract: We propose a universal and practical scheme to realize polarization-free second-order nonlinear frequency-conversion processes, including sum-frequency generation, difference-frequency generation, and optical parametric amplification. This scheme is based on the optical superlattice with a noncritical phase-matching condition, which is suitable for optical integration. A chirped dual-period structure is proposed to ensure the efficiency and stability of the conversions.
authors.affiliation: National Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210093, China.
authors.forename: X J
authors.initials: XJ
authors.lastname: Lv
authors.forename: J
authors.initials: J
authors.lastname: Lu
authors.forename: Z D
authors.initials: ZD
authors.lastname: Xie
authors.forename: J
authors.initials: J
authors.lastname: Yang
authors.forename: G
authors.initials: G
authors.lastname: Zhao
authors.forename: P
authors.initials: P
authors.lastname: Xu
authors.forename: Y Q
authors.initials: YQ
authors.lastname: Qin
authors.forename: S N
authors.initials: SN
authors.lastname: Zhu