Powerful, efficient and portable optical frequency flat-top microcombs convert more light into a useful rainbow

https://phys.org/news/2024-10-powerful-compact-optical-frequency-unique.html

"ultra low-loss silicon nitride waveguides... improved efficiency through coupled micro-resonators' better energy flow, broader pumping, improved temporal overlap between pump/ soliton... even power across comb lines enables consistent signal strength across multiple channels... methods: continuous-wave laser pumping, pulsed, parametrically-pumped microcombs... spectroscopy, optical frequency synthesis, astronomical calibration, compact atomic clocks, optical communications, LiDAR, microwave photonics"

See also: Interdisciplinary advances in microcombs: Bridging physics and information technology
https://phys.org/news/2024-10-interdisciplinary-advances-microcombs-bridging-physics.html