Smaller, cheaper, more easily-fabricated narrow-linewidth monolithic laser on a chip with record 983Hz frequency purity

https://phys.org/news/2025-09-narrow-linewidth-laser-chip-standard.html

"topological interface state extended laser with optical injection locking... distributed feedback laser with no hybrid integrations/ bulky external components... indium phosphide semiconductor substrate... chip has 3 regions, each with own optical phase tuned to keep light evenly distributed between them... chip integrated micro-ring resonator enables internal light recycling... easily switchable between optical phases, required in: quantum key distribution underpinning unbreakable encryption, advanced communication devices"

Related:

Uniting the light spectrum on a chip
https://www.eurekalert.org/news-releases/1097748

Synthetic magnetic fields steer light on a chip for faster communications
https://www.eurekalert.org/news-releases/1098131