Just Accepted

Just Accepted manuscripts are peer-reviewed and accepted for publication. They are posted online prior to technical editing formatting for publication and author proofing.

  • Quantum cascade superluminescent light emitters with high power and compact structure

    Jialin Sun, Chuncai Hou, Hongmei Chen, Jinchuan Zhang, Ning Zhuo, Jiqiang Ning, Changcheng Zheng, Zhanguo Wang, Fengqi Liu, Ziyang Zhang

    Available online

    Abstract Full Text PDF

    Quantum cascade (QC) superluminescent light emitters (SLEs) have emerged as desirable broadband mid-infrared (MIR) light sources for growing number of applications in areas like medical imaging, gas sensing and national defense. However, it is challenging to obtain a practical high-power device due to the very low efficiency of spontaneous emission in the intersubband transitions in QC structures. Herein a design of ~5 μm SLEs is demonstrated with a two-phonon resonance-based QC active structure coupled with a compact combinatorial waveguide structure which comprises a short straight part adjacent to a tilted stripe and to a J-shaped waveguide. The as-fabricated SLEs achieve a high output power of 1.8 mW, exhibiting the potential to be integrated into array devices without taking up too much chip space. These results may facilitate the realization of SLE arrays to attain larger output power and pave the pathway towards the practical applications of broadband MIR light sources.

  • Analysis of the time domain characteristics of tapered semiconductor lasers

    Desheng Zeng, Zhong Li, Suping Liu, Xiaoyu Ma

    Available online

    Abstract Full Text PDF

    We use traveling wave coupling theory to investigate the time domain characteristics of tapered semiconductor lasers with DBR gratings. We analyze the influence of the length of second order gratings on the power and spectrum of output light, and optimizing the length of gratings, in order to reduce the mode competition effect in the device, and obtain the high power output light wave with good longitudinal mode characteristics.

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