Lasing in a Hybrid Rare‐Earth Silicon Microdisk

Silicon photonics is an ideal platform for low-cost, energy-efficient, and high-performance optical microsystems. However, because silicon inefficient light emitting material, the development of simple, inexpensive, scalable monolithic amplifiers sources has been a significant challenge. Here, gain lasing in ultra-compact hybrid rare-earth microdisk resonator are reported. The design straightforward compatible with fabrication steps device dimensions available all foundries, while thulium-doped tellurite medium added low-temperature single-step sputter deposition. This approach allows low-cost high-volume wafer-scale manufacturing co-integration passive active devices no adjustment to standard process flows. laser pumped at telecom wavelengths around 1.6 µm exhibits stable single-mode emission 1.9 µm, internal slope efficiency 60% >1 mW on-chip output power. highly promising emerging communications sensing applications opens new possibilities lasers directly on silicon.