title: Mode tailoring in a ridge-type periodically poled lithium niobate waveguide.
abstract: We present a simple and powerful method for mode generation and transformation in a ridge-type periodically poled lithium niobate (PPLN) waveguide by the use of second-order nonlinear effect and local-temperature-control technique. We show that a Hermite-Gaussian (HG) mode wave (among HG(00) to HG(22)) can be selectively generated via the quasi-phase-matching (QPM) nonlinear process in a PPLN waveguide by tuning the wavelength of fundamental wave or the temperature of the waveguide. As well, it is demonstrated that HG mode can be transformed into Laguerre-Gaussian (LG) one via combination of HG modes which are simultaneously generated in a single PPLN waveguide with local-temperature-control technique.
authors.affiliation: Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju 500-712, Republic of Korea. laks@gist.ac.kr
authors.forename: Y L
authors.initials: YL
authors.lastname: Lee
authors.forename: W
authors.initials: W
authors.lastname: Shin
authors.forename: B-A
authors.initials: BA
authors.lastname: Yu
authors.forename: C
authors.initials: C
authors.lastname: Jung
authors.forename: Y-C
authors.initials: YC
authors.lastname: Noh
authors.forename: D-K
authors.initials: DK
authors.lastname: Ko