(Quantum Accelerator) Rb 2-Photon Optical Atomic Clock
Abstract
Abstract Publicly Releasable Next generation atomic clocks based on optical transitions have far surpassed microwave-based clock performance in both precision and repeatability. Nonetheless, the backbone of many precision timing, navigation, and synchronization technologies today still depend on, and are limited by, proven and reliable microwave-based clock technology. These systems provide low cost, size, weight and power (CSWaP) for field-deployable and satellite-based missions. However, there still remains a large gap between the highest performing cold-atom and lattice based optical clocks and the CSWaP required to support many technologies needed today. Vapor cell based 2- photon optical atomic clocks have proven to be a viable option for rugged and low CSWaP performance. Nevertheless, fundamental limits to performance remain. We will demonstrate the feasibility of a clock architecture that addresses known limitations of previous 2-photon vapor cell Rb clocks, improving upon short- and long-term stability with the goal of reducing CSWaP in its design compared to previous work. To achieve this, we propose direct frequency comb excitation of the 5S1-2 ?5D5-2 2-photon clock transition in 87Rb, using a single frequency comb for both probing the clock transition and providing the clock readout. The use of a single laser in the clock architecture will simplify the design, enable additional degrees of freedom in optimizing the clock readout, and significantly reduce CSWaP compared to previous work. Furthermore, the broad spectrum of the frequency comb provides light at multiple wavelengths. By tailoring the comb spectrum, direct fs comb excitation can provide both clock excitation and can be used to explore techniques for cancelation of the light shift. Minimization of the light shift can provide improved short-term stability through the use of higher powers to drive the clock transition, and improved long-term performance owing to a decreased sensitivity on absolute power fluctuations.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 25, 2023
- Source ID
- FA95502110021
Entities
People
- R. Jason Jones
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of Arizona