Er:Ti:LiNbO3 ridge waveguide optical amplifiers by optical grade dicing and three-side Er and Ti in-diffusion
Er:Ti:LiNbO3 ridge waveguide optical amplifiers by optical grade dicing and three-side Er and Ti in-diffusion
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DOI：
10.1007/s00340-016-6635-1
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发表时间：
2017-04-01
影响因子：
2.1
通讯作者：
Kip, Detlef
中科院分区：
文献类型：
--
作者：
Suntsov, Sergiy;Rueter, Christian E.;Kip, Detlef
首次报道了用1486 nm激光二极管泵浦的X切割同成分LiNbO_3基片掺Er钛扩散脊形波导光放大器。当耦合泵浦功率为200 mW时，在2.5 cm长的光波导中获得了2.7dB/cm的高内增益，超过了文献报道的Er：Ti：LiNbO_3沟道光波导值。为了提高增益，我们开发了一种新的技术，该技术包括用金刚石刀片切割脊线，然后三面沉积Er2+和Ti2+层和高温扩散。从而既获得了更高的Er浓度和更对称的扩散分布，又由于高温平滑的波导侧壁而获得了更低的散射损耗。
Erbium-doped titanium in-diffused ridge waveguide optical amplifiers in x-cut congruent-LiNbO3 substrates pumped by a 1486 nm laser diode are reported for the first time. High internal gain of 2.7 dB/cm has been demonstrated in 2.5 cm long waveguides for the coupled pump power 200 mW exceeding the best literature values reported for Er: Ti: LiNbO3 channel waveguides. For gain improvement, we have developed a novel technique which is comprised of ridge definition using diamond blade dicing followed by three-side erbium (Er) and titanium (Ti) layer deposition and high-temperature diffusion. Thereby both higher Er concentrations with more symmetric diffusion profiles and lower scattering losses due to the high-temperature smoothened waveguide side walls have been obtained.