Lu F, Meng M Q, Wang K M, Liu X D, Chen H C, Shen D Y
Opt Lett. 1997 Feb 1;22(3):163-5. doi: 10.1364/ol.22.000163.
The first planar optical waveguide to the authors' knowledge has been formed in Cu-doped potassium sodium strontium barium niobate crystal by mega-electron-volt He(+) implantation. Both TE and TM modes are observed. The profiles of the ordinary and the extraordinary refractive indices are deduced from dark-line mode spectroscopy. The results show that the mega-electron-volt He implantation results in a decrease in refractive index in barriers for both n(o) and n(e), but for n(e) there is an obvious increase in the waveguide region. From an experiment in photorefractive two-wave mixing, it is found that the erasure time for two-wave mixing is prolonged by ion implantation.
据作者所知，首个平面光波导是通过兆电子伏特He(+)注入在掺铜的铌酸钾钠锶钡晶体中形成的。TE和TM模式均被观测到。寻常折射率和非寻常折射率的分布是由暗线模式光谱法推导出来的。结果表明，兆电子伏特He注入导致n(o)和n(e)的势垒折射率均下降，但对于n(e)，波导区域有明显增加。通过光折变二波混频实验发现，离子注入使二波混频的擦除时间延长。
