19 August 2017 High-power spiral cavity quantum cascade superluminescent emitters with a passive loop back facet
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Abstract
We report on the experimental demonstration of a high-power (<100  mW) quantum cascade superluminescent (SL) emitter employing a spiral cavity with a passive loop back facet. By replacing the rounded, wet-etched, antireflection coated back facet of a spiral cavity with a passive loop facet, the lasing action was suppressed (i.e., threshold current density increased) due to a decrease in the back facet reflectivity. This type of facet allowed us to achieve a twofold increase in the peak SL power by employing a 16-mm-long spiral cavity.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Mei C. Zheng, Mei C. Zheng, Yezhezi M. Zhang, Yezhezi M. Zhang, Peter Q. Liu, Peter Q. Liu, Xiaojun Wang, Xiaojun Wang, Jen-Yu Fan, Jen-Yu Fan, Mariano Troccoli, Mariano Troccoli, Claire F. Gmachl, Claire F. Gmachl, } "High-power spiral cavity quantum cascade superluminescent emitters with a passive loop back facet," Optical Engineering 57(1), 011001 (19 August 2017). https://doi.org/10.1117/1.OE.57.1.011001 . Submission: Received: 19 May 2017; Accepted: 20 July 2017
Received: 19 May 2017; Accepted: 20 July 2017; Published: 19 August 2017
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