Room-temperature quantum cascade superluminescent light emitters with wide bandwidth and high temperature stability.
Room-temperature quantum cascade superluminescent light emitters with wide bandwidth and high temperature stability.
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具有宽带宽和高温稳定性的室温量子级联超发光发光体。
DOI：
10.1364/oe.26.013730
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发表时间：
2018
期刊：
影响因子：
3.8
通讯作者：
Fengqi Liu
中科院分区：
文献类型：
--
作者：
Chuncai Hou;Jialin Sun;J. Ning;Jinchuan Zhang;N. Zhuo;Hong;Yuan;Z. Wang;Ziyang Zhang;Fengqi Liu
室温(RT)中红外(MIR)宽带光源的实现从根本上讲是有趣的，并且对于许多应用来说是非常理想的。近年来，基于量子级联(QC)结构的超辐射发光器件(SLEs)已成为中红外宽带光源的理想候选光源。然而，由于子带间跃迁中自发辐射的效率很低，实现RT-QCSLEs是具有挑战性的。在这里，我们展示了用双声子共振QC有源区和单片集成波导结构实现连续波(CW)或准连续波(10%占空比)工作的~5μm RT-SLEs。此外，由于采用了倾斜锥形腔的设计，该激光器具有较高的毫瓦功率、200 cm-1以上的大光谱宽度和良好的温度特性。这些结果被认为是迈向宽带MIR半导体光源应用的一大步。
The realization of room-temperature (RT) mid-infrared (MIR) broadband light sources is fundamentally interesting and highly desirable for a number of applications. Recently, superluminescent light emitters (SLEs) based on quantum cascade (QC) structures have emerged as excellent candidates among mid-infrared broadband light sources. However, it is challenging to achieve RT-QCSLEs due to the very low efficiency of the spontaneous emission in the intersubband transitions. Here, we demonstrate the realization of a set of ~5 μm RT-SLEs under continuous wave (CW) or quasi-CW (10% duty circle) operation by using a two-phonon resonant QC active region and monolithic integrated waveguide structures. In addition, with the design of an inclined tapered cavity, the SLEs exhibit high milliwatt power, large spectral width of more than 200 cm-1 and good temperature characteristic. These demonstrated results are believed to be a big step forward to the applications of broadband MIR semiconductor light sources.