Journal
PHOTONICS
Volume 9, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/photonics9010029
Keywords
quantum cascade laser; mid-infrared photonics; external optical feedback; non-linear dynamics
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This study investigates the behavior of quantum-cascade lasers under external optical feedback, with a focus on the influence of beam-splitter characteristics on optical power properties. The results show that packaged quantum-cascade lasers exhibit extended conditions of operation and increased maximum power under strong optical feedback. Various non-linear dynamics were observed by adding a periodic electrical perturbation.
The topic of external optical feedback in quantum-cascade lasers is relevant for stability and beam-properties considerations. Albeit less sensitive to external optical feedback than other lasers, quantum-cascade lasers can exhibit several behaviors under such feedback, and those are relevant for a large panel of applications, from communication to ranging and sensing. This work focused on a packaged Fabry-Perot quantum-cascade laser under strong external optical feedback and shows the influence of the beam-splitter characteristics on the optical power properties of this commercially available laser. The packaged quantum-cascade laser showed extended conditions of operation when subject to strong optical feedback, and the maximum power that can be extracted from the external cavity was also increased. When adding a periodic electrical perturbation, various non-linear dynamics were observed, and this complements previous efforts about the entrainment phenomenon in monomode quantum-cascade lasers, with the view of optimizing private communication based on mid-infrared quantum-cascade lasers. Overall, this work is a step forward in understanding the behavior of the complex quantum-cascade-laser structure when it is subjected to external optical feedback.
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