Pandiyan Krishnamoorthy, Kang Yeon Sook, Lim Hwan Hong, Kim Byoung Joo, Cha Myoungsik
Department of Physics, Pusan National University, Busan 609-735, Republic of Korea.
Opt Express. 2009 Sep 28;17(20):17862-7. doi: 10.1364/OE.17.017862.
Quasi-phase-matching devices are usually fabricated by electric field poling over photolithographically defined electrode patterns on ferroelectric crystal substrates. For the optimal nonlinear optical performance of such devices, the micro-poled domain structure must ensure good fidelity to the designed grating structure. We present a nondestructive diffraction method to evaluate the quality of periodically poled lithium niobate crystals, by utilizing index modulation caused by the internal field effects. Our proposed method is much simpler than the conventional second-harmonic generation experiment, and provides a fast, low-cost but accurate means for micro-poling quality evaluation.
准相位匹配器件通常是通过在铁电晶体衬底上光刻定义的电极图案上进行电场极化来制造的。为了使此类器件具有最佳的非线性光学性能，微极化畴结构必须确保与设计的光栅结构具有良好的保真度。我们提出了一种无损衍射方法，通过利用内场效应引起的折射率调制来评估周期性极化铌酸锂晶体的质量。我们提出的方法比传统的二次谐波产生实验要简单得多，并且为微极化质量评估提供了一种快速、低成本但准确的手段。
