Highly coherent two-color laser and its application for low-noise microwave generation.

ABSTRACT: Two-color lasers with high coherence are essential for precision measurements and low-noise photonic microwave generation. However, conventional two-color lasers often suffer from reduced coherence when the frequency spacing is large. Here, we leverage the Pound-Drever-Hall technique to synchronize two lasers to a common ultra-stable optical reference cavity to break through the thermal noise constraint, achieving a highly coherent two-color laser. By overcoming non-common mode noise, we achieve an exceptional fractional frequency instability of 2.7 × 10^-17 at 1 second, normalized to the optical frequency. To characterize coherence across large frequency spacings, we use electro-optical frequency division to transfer the stability of a 0.5 THz spaced two-color laser to a 25 GHz

SUBMITTER: He B 

PROVIDER: S-EPMC12041592 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature