Providing 1E-16 short-term stability of a 1.5 {\mu}m laser to optical clocks

TL;DR

This paper demonstrates transferring ultra-stable laser frequency stability from a 1.5 μm laser to a 698 nm laser using a femtosecond fiber comb, enabling high-resolution atomic clock spectroscopy.

Contribution

It introduces a method for achieving 1E-16 fractional frequency stability transfer between lasers at different wavelengths with detailed noise analysis.

Findings

Achieved 1E-16 fractional frequency stability transfer

Resolved the Sr clock transition to a 1.5 Hz linewidth

Detailed analysis of noise sources from the frequency comb

Abstract

We report on transferring 1E-16-level fractional frequency stability of a "master laser" operated at 1.5 {\mu}m to a "slave laser" operated at 698 nm, using a femtosecond fiber comb as transfer oscillator. With the 698 nm laser, the 1S_0 - 3P_0 clock transition of 87Sr was resolved to a Fourier-limited line width of 1.5 Hz (before: 10 Hz). Potential noise sources contributed by the frequency comb are discussed in detail.