Mode-locked waveguide polariton laser

Souissi, H and Gromovyi, M and Septembre, I and Develay, V and Brimont, C and Doyennette, L and Cambril, E and Bouchoule, S and Alloing, B and Frayssinet, E and Zúñiga-Pérez, J and Ackemann, T and Malpuech, G and Solnyshkov, D D and Guillet, T (2024) Mode-locked waveguide polariton laser. Optica, 11 (7). pp. 962-970. ISSN 1899-7015 (https://doi.org/10.1364/OPTICA.524753)

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Abstract

So far, exciton-polariton (polariton) lasers were mostly single mode lasers based on microcavities. Despite the large repulsive polariton-polariton interaction, pulsed mode-locked polariton laser was never reported. Here, we use a 60 −long GaN-based waveguide surrounded by distributed Bragg reflectors forming a multi-mode horizontal cavity. We demonstrate experimentally and theoretically a polariton mode-locked micro-laser operating in the blue-UV, at room temperature, with a 300 repetition rate and 100 -long pulses. The mode locking is demonstrated by the compensation (linearization) of the mode dispersion by the self-phase modulation induced by the polariton-polariton interaction. It is also supported by the observation in experiment and theory of the typical envelope frequency profile of a bright soliton.

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