Analysis of germanium waveguide laser performance under external phonon injection.
Analysis of germanium waveguide laser performance under external phonon injection.
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DOI：
10.1364/oe.27.004157
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发表时间：
2019-02
期刊：
影响因子：
3.8
通讯作者：
Senbiao Qin;Junqiang Sun;Jialin Jiang
中科院分区：
文献类型：
--
作者：
Senbiao Qin;Junqiang Sun;Jialin Jiang
提出并设计了一种外声子注入的锗波导激光器，以降低激光阈值。考虑到声子注入和声光重叠效应，进一步发展了光子-声子激光作用理论。在激光器结构中引入声子晶体波导以增强声光互作用，分析了锗波导中光子-声子激光作用的特点。利用外声子注入，可以促进双量子跃迁，建立光-声子激光作用。讨论了声子晶体波导参数、光场和声场的重叠以及声子注入对激光行为的影响。得到了最佳的波导结构参数，通过增大光场和声场的重叠来增强声光互作用。结果表明，对于长度为200 μm的Ge波导，当平均声子注入浓度为2.5 × 1021 cm-3时，阈值电流降至0.2 μA，斜率效率达到0.7W/A.我们提出的方案为在集成锗波导中实现激光振荡提供了一种有效的途径。
We propose and design a germanium (Ge) waveguide laser under external phonon injection to reduce laser threshold. To take the phonon injection and the acousto-optic overlap into consideration, the theory of the photon-phonon laser action is further developed. The phononic crystal waveguide is introduced in the laser structure to intensify acousto-optic interaction, and characteristics of photon-phonon laser action in Ge waveguide are analyzed. With the external phonon injection, the two-quantum transition can be facilitated and the photon-phonon laser action is able to be established. The impacts of phononic crystal waveguide parameters, overlap of optical and acoustic fields, and phonon injection on the laser behavior are discussed. Optimal waveguide structural parameters are obtained to enhance acousto-optic interaction through the enlargement of the overlap of optical and acoustic fields. The results indicate that, for a Ge waveguide with the length of 200 μm, the threshold current is reduced to 0.2 μA and the slope efficiency reaches 0.7 W/A when the average phonon injection concentration is about 2.5 × 1021 cm-3. Our proposed scheme offers an effective approach to achieve laser oscillation in integrated Ge waveguide.