Linewidth narrowing in self-injection-locked, on-chip lasers

https://phys.org/news/2023-07-linewidth-narrowing-self-injection-locked-on-chip-lasers.html

"carrier quantum confinement dynamic and spectral characteristics locked composite cavity device... reductions in the lasing linewidth of a laser diode to the Hz-level... attainable emission spectral refinement integrating III-V QW or QD distributed feedback lasers with SiN microring resonators... reductions in the lasing linewidth of a laser diode to the Hz-level... multi-decision algorithm was then employed to identify the optimal design-operation points for each optimization variable"

Related: Realizing vertical ultraviolet-B semiconductor laser diodes for high optical output
https://phys.org/news/2023-10-vertical-ultraviolet-b-semiconductor-laser-diodes.html