Mode-locked GaN waveguide polariton laser

• Main Authors: Souissi, H., Gromovyi, M., Septembre, I., Develay, V., Brimont, C., Doyennette, L., Cambril, E., Bouchoule, S., Alloing, B., Frayssinet, E., Zúñiga-Pérez, Jesús, Ackemann, T., Malpuech, G., Solnyshkov, D. D., Guillet, T.
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2024
• Subjects: Physics; Distributed-bragg-reflectors; Exciton-polariton
• Online Access: https://hdl.handle.net/10356/181626
• Institution: Nanyang Technological University

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 $60 \ \mu m-$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$\ GHz$ repetition rate and 100$\ fs$-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.