Cs microcell optical reference at 459 nm with short-term frequency stability below 2 × 10^-13

2025/01/30 by Klinger, E., Rivera-Aguilar, C. M., Mursa, A. +3
#Applied Physics (physics.app-ph) #Atomic Physics (physics.atom-ph) #FOS: Physical sciences

paper · doi:10.48550/arxiv.2501.18422

Abstract

We describe the short-term frequency stability characterization of external-cavity diode lasers stabilized onto the 6S_1/2-7P_1/2 transition of Cs atom at 459 nm, using a microfabricated vapor cell. The laser beatnote between two nearly-identical systems, each using saturated absorption spectroscopy in a simple retroreflected configuration, exhibits an instability of 2.5×10^-13 at 1 s, consistent with phase noise analysis, and 3× 10^-14 at 200 s. The primary contributors to the stability budget at one second are the FM-AM noise conversion and the intermodulation effect, both emerging from laser frequency noise. These results highlight the potential of microcell-based optical references to achieve stability performances comparable to that of an active hydrogen maser in a remarkably simple architecture.

Related

• Short-term stability of a microcell optical reference based on Rb atom two-photon transition at 778 nm
• Sub-Doppler spectroscopy of the near-UV Cs atom 6S_1/2-7P_1/2 transition in a microfabricated vapor cell
• Demonstration of \bf3.5×10^-13 laser frequency stability at 1000 s using an iodine-filled hollow-core fiber photonic microcell
• Compact laser system with frequency stability dissemination for optical clocks and quantum computing
• Phase stability transfer across the optical domain using a commercial\n optical frequency comb system