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Dielectric Highly Reflective Mirror Coatings for 4–5 μm Quantum Cascade Lasers

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Abstract

Dielectric mirrors for mid-IR quantum cascade lasers are calculated. Optimal dielectric materials are selected to minimize the absorption of laser radiation. Samples of quantum cascade lasers emitting in the spectral range of 4–5 μm and having various dielectric highly reflective mirror coatings are manufactured and their characteristics are studied. It is shown that the deposition of a highly reflective Si–Si3N4 coating on the back face of the laser cavity leads to an increase in the output optical power of the lasers by 71% compared to control samples without coatings. The use of a Si–SiO2 coating makes it possible to increase the output power of the lasers by 88%.

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Funding

The development of mirror coatings was performed within the Competitiveness Enhancement Program of the National Research Nuclear University MEPhI (project no. 02.a03.21.0005). Experimental studies of QCLs were carried out with the support of the Russian Science Foundation (project no. 21-72-30020).

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Correspondence to K. A. Podgaetskii.

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Translated by I. Ulitkin

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Podgaetskii, K., Lobintsov, A., Danilov, A. et al. Dielectric Highly Reflective Mirror Coatings for 4–5 μm Quantum Cascade Lasers. Bull. Lebedev Phys. Inst. 50 (Suppl 10), S1079–S1083 (2023). https://doi.org/10.3103/S1068335623220086

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  • DOI: https://doi.org/10.3103/S1068335623220086

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