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arXiv 2102.07388physics.optics
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量子点微柱激光器的光抽运

Optical pumping of quantum dot micropillar lasers

L. Andreoli, X. Porte, T. Heuser, J. Grosse, B. Moeglen-Paget, L. Furfaro, S. Reitzenstein, D. Brunner

摘要:

量子点微柱激光器阵列是更广泛的纳米光子学领域各种应用的有吸引力的技术平台。特别感兴趣的是潜在的效率提高腔量子电动力学效应的结果,这使得它们成为神经网络硬件中的下一代光子神经元的主要候选者。然而,特别是对于光泵浦,它们的功率转换效率可能非常低。在这里,我们进行了深入的实验分析的量子点微激光器,并研究其输入输出关系在很宽的范围内的光泵浦条件。我们发现,目前的能量效率限制是由不利的光泵浦概念和激子转换效率低。我们的研究结果表明,对于非共振泵浦到GaAs矩阵(润湿层),3.4%(0.6%)的光泵转换成激光相关的激子,只有2%(0.75%)的激光跃迁提供增益。根据我们的研究结果,我们建议提高泵浦效率的数量级,通过增加铝含量的AlGaAs/GaAs镜对上布拉格反射器。

英文摘要:

Arrays of quantum dot micropillar lasers are an attractive technology platform for various applications in the wider field of nanophotonics. Of particular interest is the potential efficiency enhancement as consequence of cavity quantum electrodynamics effects which makes them prime candidates for next generation photonic neurons in neural network hardware. However, in particular for optical pumping their power-conversion efficiency can be very low. Here we perform an in-depth experimental analysis of quantum dot microlasers and investigate their input-output relationship over a wide range of optical pumping conditions. We find that the current energy efficiency limitation is caused by disadvantageous optical pumping concepts and by a low exciton conversion efficiency. Our results indicate that for non-resonant pumping into the GaAs matrix (wetting layer), 3.4% (0.6%) of the optical pump is converted into lasing-relevant excitons, and of those only 2% (0.75%) provide gain to the lasing transition. Based on our findings we propose to improve the pumping efficiency by orders of magnitude by increasing the aluminium content of the AlGaAs/GaAs mirror pairs in the upper Bragg reflector.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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