23 February 2009 Quality evaluation of quasi-phase-matched devices by far-field diffraction pattern analysis
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Periodically poled ferroelectric crystals form highly efficient quasi-phase matched optical frequency conversion devices. For optimal performance of such devices, accurate period and duty-cycle are required throughout the poled region. For the quality evaluation we demonstrate a simple and a powerful technique using far-field diffraction measurement. Periodically poled lithium niobates were fabricated and etched out to reveal a surface-relief grating. The far-field diffraction pattern was analyzed to obtain statistical information for the duty-cycle. We explored the equivalence between the linear diffraction experiment and the conventional second-harmonic generation method for poling quality evaluation, through the Fourier-transform of the spatial modulation of domains.
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Krishnamoorthy Pandiyan, Krishnamoorthy Pandiyan, Yeon Sook Kang, Yeon Sook Kang, Hwan Hong Lim, Hwan Hong Lim, Byeong Joo Kim, Byeong Joo Kim, Myoungsik Cha, Myoungsik Cha, } "Quality evaluation of quasi-phase-matched devices by far-field diffraction pattern analysis", Proc. SPIE 7197, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VIII, 71970R (23 February 2009); doi: 10.1117/12.808464; https://doi.org/10.1117/12.808464

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