Ridge Waveguides and Y-Branch Beam Splitters in KTiOAsO4 Crystal by 15 MeV Oxygen Ion Implantation and Femtosecond Laser Ablation

Ridge Waveguides and Y-Branch Beam Splitters in KTiOAsO4 Crystal by 15 MeV Oxygen Ion Implantation and Femtosecond Laser Ablation
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KTiOAsO4 晶体中的脊波导和 Y 分支分束器,采用 15 MeV 氧离子注入和飞秒激光烧蚀

DOI:
10.1109/jlt.2016.2636998
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发表时间:
2017-01
影响因子:
4.7
通讯作者:
Chen Feng
Chen Feng
中科院分区:
工程技术2区
文献类型:
--
作者:
Chen Chen;Akhmadaliev Shavkat;Romero Carolina;Vazquez de Aldana Javier R.;Zhou Shengqiang;Chen Feng

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采用15 MeV氧离子注入和飞秒激光烧蚀相结合的方法在KTiOAsO4非线性光学晶体中制备了脊形波导和Y分支分束器。分别在633和808 nm的波长下研究了导光特性,显示出光传播的高偏振灵敏度。这些分束器的分束比取决于内耦合对准。基于重构的折射率分布,对分裂光束的模式分布进行了模拟,模拟结果与实验结果吻合较好。在473和573 K下分别进行1h的分步退火处理后,这些波导结构的传播损耗已大大降低。
We report on the fabrication of ridge waveguides and Y-branch beam splitters in KTiOAsO4 nonlinear optical crystal by the combination of 15 MeV oxygen (O5+) ion implantation and femtosecond laser ablation. Guiding properties were investigated at the wavelengths of 633 and 808 nm, respectively, showing high polarization sensitivity of light propagation. Splitting ratios of these beam splitters are dependent on in-coupling alignment. The simulated guiding modal distributions of splitted guided beams, which was based on a reconstructed refractive index profile, shows reasonable consistence with the measured ones. After the stepwise annealing treatment at 473 and 573 K for 1 h each, the propagation losses for these guiding structures have been reduced considerably.
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