We demonstrate quasi-phase-matched (QPM) second-harmonic generation (SHG) at the optical communication wavelengths with side-chain polymer waveguides. A ridge waveguide structure is designed to support fundamental mode guiding at both the pump and the second harmonics, leading to a high field overlap integral of the guided modes. The nonlinearity contrast in the +/0 type QPM waveguide is maximized under a QPM poling electrode width of nearly half the coherence length. Using these configurations, we record a normalized SHG efficiency of 2.2% W<sup>-1</sup> cm<sup>-2</sup> in the polymer waveguide.
© 2004 Optical Society of America
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4710) Nonlinear optics : Optical nonlinearities in organic materials
(230.4320) Optical devices : Nonlinear optical devices
(250.5460) Optoelectronics : Polymer waveguides
Jung Jin Ju, Jongbae Kim, Jung Yun Do, Min-su Kim, Seung Koo Park, Suntak Park, and Myung-Hyun Lee, "Second-harmonic generation in periodically poled nonlinear polymer waveguides," Opt. Lett. 29, 89-91 (2004)