
Harvard, TU Wien Unveil Racetrack Laser Producing Stable Mid‑Infrared Frequency Comb
Harvard and TU Wien have built a miniature racetrack‑shaped laser that creates stable frequency combs in the mid‑infrared. The device solves a long‑standing feedback problem that ruins standard combs. It could lead to chip‑scale gas sensors for greenhouse gas monitoring, industrial process control, or breath analysis. The work was led by Federico Capasso and published in Optica.














