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Evidence of linear chirp in mid-infrared quantum cascade lasers
Optica ( IF 10.4 ) Pub Date : 2018-08-01 , DOI: 10.1364/optica.5.000948
Matthew Singleton , Pierre Jouy , Mattias Beck , Jérôme Faist

Since the first demonstration of the quantum cascade laser (QCL) frequency comb in 2012, there have been open questions concerning the reproducibility of comb states, and, critically for metrological applications, the phase stability. To address these important issues, we measure the intermodal phase relation of a QCL comb operating at 8 μm using a coherent beatnote spectroscopy. We find these intermodal phase differences to be constant within experimental uncertainty over several repeat measurements, and the comb states reproducible to an average of 21 mrad after cycling the power of the device. These phases describe a comb state exhibiting a simple, linear chirp, which in fact corresponds to the lowest state of chirp to minimize the amplitude modulation, as required for combs driven by four-wave mixing in a gain medium with a short gain recovery lifetime. All together, these findings could pave the way for pulse shaping in the QCL platform.

中文翻译:

中红外量子级联激光器中线性chi的证据

自2012年首次展示量子级联激光器(QCL)频率梳以来,一直存在有关梳状态的可再现性,以及对于计量学应用而言至关重要的相位稳定性的悬而未决的问题。为了解决这些重要问题,我们使用相干节拍谱仪测量了工作在8μm的QCL梳的联运态相位关系。我们发现这些模态相位差在多次重复测量的实验不确定性范围内是恒定的,并且在重启设备的电源后,梳状状态可重现至平均21 mrad。这些阶段描述的梳状状态表现出简单的线性线性调频,实际上它对应于线性调频的最低状态,以最大程度地减小幅度调制,这是在增益恢复寿命短的增益介质中由四波混合驱动的梳子所需要的。总之,这些发现可以为QCL平台中的脉冲整形铺平道路。
更新日期:2018-08-20
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