Lasing in a Hybrid Rare‐Earth Silicon Microdisk (Laser Photonics Rev. 16(1)/2022)

Silicon Lasers In article number 2100348, Khadijeh Miarabbas Kiani and co‐workers show that optical gain and lasing in an ultra‐compact hybrid rare‐earth silicon microdisk resonator emits at 1.9 µm, with an internal slope efficiency of 60% and >1 mW on‐chip output power. The thulium laser is fabricated using low‐temperature, and straightforward wafer‐scale post‐processing steps, which opens the potential for large‐scale integration of monolithic 2‐µm‐band amplifiers and light sources within advanced silicon photonic microsystems.