Breakthrough in optical metrology: Chip-scale laser measures distances for LiDAR and detects gravitational direction fast/ accurately

https://phys.org/news/2025-06-laser-smaller-penny-ultrafast.html

"no: bulky/ expensive equipment to achieve delicate laser-wave control... measures by precisely changing its color across broad light spectrum at about 10 quintillion times/ second... made with lithium niobate, uses Pockels effect, changing material's refractive index when electric field present... Pound-Drever-Hall (PDH) laser frequency locking, narrowing down, stabilizing, reducing laser's noise for optical clocks... LiDAR system on fast-spinning disk"