Chen Chen, Rüter Christian E, Volk Martin F, Chen Cheng, Shang Zhen, Lu Qingming, Akhmadaliev Shavkat, Zhou Shengqiang, Chen Feng, Kip Detlef
Opt Express. 2016 Jul 25;24(15):16434-9. doi: 10.1364/OE.24.016434.
We report on the fabrication of ridge waveguides in KTiOPO nonlinear optical crystals through carbon ion irradiation followed by precise diamond blade dicing. The diced side-walls have low roughness, which allows for low propagation loss of ~1dB/cm in fabricated of ridges. The waveguide property investigation has been performed at 1064 nm as well as 532 nm, showing good guidance at both TE and TM polarizations. Based on type II phase matching configuration, efficient second harmonic generation of green light at room temperature has been realized. High conversion efficiencies of ~1.12%W and ~12.4% have been obtained for frequency doubling under the pump of continuous-wave (CW) and pulsed fundamental waves at 1064 nm, respectively.
我们报道了通过碳离子辐照然后精确的金刚石刀片切割在KTiOPO非线性光学晶体中制备脊形波导的方法。切割后的侧壁粗糙度低，这使得在制备的脊中传播损耗低至约1dB/cm。已经在1064nm和532nm波长下进行了波导特性研究，结果表明在TE和TM偏振下都具有良好的导光性能。基于II型相位匹配配置，在室温下实现了高效的绿光二次谐波产生。在1064nm连续波（CW）和脉冲基波泵浦下倍频时，分别获得了约1.12%W和约12.4%的高转换效率。
