Frequency-stabilization to 6x10^-16 via spectral-hole burning

Abstract

We demonstrate two-stage laser stabilization based on a combination of Fabry- Perot and spectral-hole burning techniques. The laser is first pre-stabilized by the Fabry-Perot cavity to a fractional-frequency stability of sigma_y(tau) < 10^-13. A pattern of spectral holes written in the absorption spectrum of Eu3+:Y2SiO5 serves to further stabilize the laser to sigma_y(tau) = 6x10^-16 for 2 s < tau < 8 s. Measurements characterizing the frequency sensitivity of Eu3+:Y2SiO5 spectral holes to environmental perturbations suggest that they can be more frequency stable than Fabry-Perot cavities.

References in corpus (4)

• Generation of Ultrastable Microwaves via Optical Frequency Division
• Making optical atomic clocks more stable with $10^{-16}$ level laser stabilization
• New Limits on Coupling of Fundamental Constants to Gravity Using ${}^{87}$Sr Optical Lattice Clocks
• Potential mechanical loss mechanisms in bulk materials for future gravitational wave detectors

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