Researchers demonstrate two-stage laser stabilization based on a combination of Fabry–Pérot and spectral-hole burning techniques. The laser was first pre-stabilized using Fabry–Pérot cavities and then modulated to address a spectral-hole pattern in Eu3+:Y2SiO5. Taking advantage of the low sensitivity of the spectral holes to environmental perturbations, the researchers obtained a fractional frequency stability of 6 × 10−16
- Michael J. Thorpe
- Lars Rippe
- Till Rosenband
