Mode switching in a multi-wavelength distributed feedback quantum cascade laser using an external micro-cavity

作者：Sidler Meinrad; Rauter Patrick; Blanchard Romain; Metivier Pauline; Mansuripur Tobias S; Wang Christine; Huang Yong; Ryou Jae Hyun; Dupuis Russell D; Faist Jerome; Capasso Federico^*

来源：Applied Physics Letters, 2014, 104(5): 051102.

DOI：10.1063/1.4863663

We demonstrate a multi-wavelength distributed feedback (DFB) quantum cascade laser (QCL) operating in a lensless external micro-cavity and achieve switchable single-mode emission at three distinct wavelengths selected by the DFB grating, each with a side-mode suppression ratio larger than 30 dB. Discrete wavelength tuning is achieved by modulating the feedback experienced by each mode of the multi-wavelength DFB QCL, resulting from a variation of the external cavity length. This method also provides a post-fabrication control of the lasing modes to correct for fabrication inhomogeneities, in particular, related to the cleaved facets position.

• 出版日期2014-2-3