Compact two-photon optical clock with a long-term stability of 8.1 × 10-15 without linear drift removal.

In this work, we stabilize a 1556.2 nm fiber laser to the 5S1/2 → 5D5/2 two-photon transition in 87Rb in a carefully designed compact physics package. A commercial fiber frequency comb divides the optical frequency into 200 MHz microwave output, whic…

Preview only. Read the full abstract at the source