GaN microlasers for integrated photonics: waveguide polariton lasers and microdisk lasers

The GaN photonic platform is of large interest for broadband integrated photonics applications, from near-UV to visible and near-IR. Here we present the latest developments in near-UV microlasers and their coupling to gratings and waveguides, based on GaN active layers. We demonstrate two iconic NUV microlasers: (i) a microdisk laser based on GaN/AlGaN quantum wells, coupled to a waveguide and an outcoupling grating; (ii) a ridge waveguide polariton laser operating with ultra-short Fabry-Perot ridge cavities (5-60µm), that is not governed by Bernard-Durrafourg condition (population inversion) as in standard ridge interband lasers. Both lasers operate around 380nm.