Portable Laser-Pumped Rb Atomic Clock with Digital Circuits

• URL: http://arxiv.org/abs/2508.12437v2
• Date: Tue, 19 Aug 2025 03:23:11 GMT
• Title: Portable Laser-Pumped Rb Atomic Clock with Digital Circuits
• Authors: Qiang Hao, Shaojie Yang, Peter Yun, Jun Ruan, Shougang Zhang,
• Abstract summary: This work presents a distributed feedback (DFB) laser-pumped Rb atomic clock, which features extraordinary frequency stability, small size and low power consumption.<n>The proposed atomic clock is also designed to operate at a low temperature, whose absorption cell is maintained at 323 K.<n>The short-term stability of the atomic clock is measured to be $1.8times10-12tau -1/2$ (1-100s)
• Score: 0.10485739694839669
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Reducing the size and complexity of high-performance timekeeping devices is an ever-growing need for various applications, such as 6G wireless technology, positioning, navigation and timing (PNT), Internet of Things (IoT), and ultrafast spectroscopy. This work presents a distributed feedback (DFB) laser-pumped Rb atomic clock, which features extraordinary frequency stability, small size and low power consumption. The DFB laser head employs a built-in isolator with a linewidth of approximately 1 MHz. For complete optical pumping of the atoms in the absorption cell, the laser beam is expanded to a diameter of 10 mm by using an optical diffuser-based beam expander. The physics package is based on a magnetron microwave cavity and surrounded by two layers of magnetic shielding. The overall volume of the optical system combined with the physics package is 250 cm$^3$. The proposed atomic clock is also designed to operate at a low temperature, whose absorption cell is maintained at 323 K. Benefiting from the lower Rb atom density, the excited atoms present a long population relaxation time of 5.8 ms. The frequency synthesizer and frequency-locked loop are implemented by digital circuits. The short-term stability of the atomic clock is measured to be $1.8\times10^{-12}\tau ^{-1/2}$ (1-100s). Our achievement paves the way for practical application of the laser-pumped Rb atomic clocks.

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