Ciers, J.Solnyshkov, D. D.Callsen, G.Kuang, Y.Carlin, J-FMalpuech, G.Butte, R.Grandjean, N.2020-11-042020-11-042020-11-042020-10-1910.1103/PhysRevB.102.155304https://infoscience.epfl.ch/handle/20.500.14299/172962WOS:000579334000005Polariton lasers are mostly based on planar cavities. Here we focus on an alternative configuration with slab waveguide modes strongly coupled to excitons confined in GaN/AlGaN quantum wells. We study experimentally and theoretically polariton relaxation at temperatures ranging from 4 to 200 K. We observe a good robustness of the lower polariton population peak energy position against temperature changes due to a balance between the shift of the exciton energy and the change in the normal mode splitting, a promising feature for future applications such as lasers and amplifiers where a small temperature drift in the emission wavelength is a desired asset. Finally, at T = 4 K we observe the signature of polariton nonlinearities occurring in the continuous wave regime that are assigned to an optical parametric oscillation process.Materials Science, MultidisciplinaryPhysics, AppliedPhysics, Condensed MatterMaterials SciencePhysicsstimulated scatteringroom-temperatureamplificationmicrocavitybottlenecklaserstext::journal::journal article::research article