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Opt Express. 2011 Apr 11;19(8):7153-60. doi: 10.1364/OE.19.007153.

Non-invasive characterization of the domain boundary and structure properties of periodically poled ferroelectrics.

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Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 106, Taiwan.


Shaping the ferroelectric domains as waveguide, grating, lens, and prism are key to the successful penetration of periodically-poled ferroelectrics on various wavelength conversion applications. The complicated structures are, however, difficult to be fully characterized, especially the unexpected index contrast at the anti-parallel domain boundaries are typical in the order of 10(-4) or less. An ultrahigh resolution optical coherence tomography was employed to fully characterize the domain boundary and structure properties of a periodically-poled lithium niobate (PPLN) waveguide with an axial resolution of 0.68 μm, an transversal resolution of 3.2 μm, and an index contrast sensitivity of 4x10(-7). The anti-parallel domain uniformity can clearly be seen non-invasively. Dispersion of the ferroelectric material was also obtained from 500 to 750 nm.


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