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Fabrication of spatial modulated second order nonlinear structures and quasi-phase matched second harmonic generation in a poled azocopolymer planar waveguide

Jian Hung Lin, Ngoc Diep Lai, Chiu Han Chiu, C. Y. Lin, G. W. Rieger, J. F. Young, F. S. S. Chien, C. C. Hsu, Opt. Express 16, 7832-7841 (2008)

This work demonstrates that arbitrary types of spatially modulated second-order susceptibility (χ(2) structures such as 1D and 2D, periodic and quasi-periodic structures can be obtained by using the combination of corona poling and direct laser writing (DLW) techniques. The fabrication technique is based on the photodepoling of azo-dye molecules caused by one-photon or two-photon absorption during the DLW process. Polarization and second harmonic generation (SHG) images of the fabricated structures were measured by electrostatic force microscope and SHG mapping techniques, respectively. Furthermore, quasi-phase-matched (QPM) enhanced SHG from a 1D periodically poled azo-copolymer planar waveguide is demonstrated using an optical parametric oscillator laser by scanning wavelength from 1500 to 1600 nm. The resonant wavelength of the QPM enhanced SHG is peaked at 1537 nm with FWHM≅2.5nm.

Open access paper: doi:10.1364/OE.16.007832

Acknowledgments
This work is a joint research between the LPQM (ENS Cachan, France) and the NanoOptics Lab (Department of Physics, National Chung Cheng University, Taiwan), in the framework of LIA (Laboratoire International Associé)  laboratory.
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