Results 261 to 270 of about 16,536 (302)

Mitigation of the magnetic-field-induced frequency shift in coherent-population-trapping atomic clocks

Applied Physics Letters
We study the magnetic-field-induced frequency shift (MFS) of the reference resonance in a coherent population trapping (CPT) microwave atomic clock. It is shown that the use of the Pound–Drever–Hall-like technique for frequency locking provides brilliant
D. V. Brazhnikov, V. Vishnyakov, M. Skvortsov   +2 more
semanticscholar   +1 more source

Progress of the Portable Rubidium Atomic Fountain Clock in SIOM

2013
A portable 87Rb atomic fountain clock has been constructed and researched in Shanghai Institute of Optics and Fine Mechanics, and some improvements have been made recently. So far, comparison data with the H-maser shows that, the Allan deviation of the relative frequency stability of this fountain clock is 5.0 × 10−13τ−1/2, which reaches 2.6 × 10−15 at
Yuanbo Du, Rong Wei, Richang Dong, Yuzhu Wang   +3 more
openaire   +1 more source

Field-programmable gate array-based residual amplitude modulation suppression and control for compact atomic clocks.

Review of Scientific Instruments
We designed a field-programmable gate array (FPGA) fabric to provide phase modulation techniques to lock lasers to optical frequency references. The method incorporates an active residual amplitude modulation (RAM) suppression scheme that relies on ...
Tin Nghia Nguyen, Thomas R. Schibli
semanticscholar   +1 more source

The Compact Laser System for Pulsed Optically Pumped Rubidium Atomic Clock

2019 Joint Conference of the IEEE International Frequency Control Symposium and European Frequency and Time Forum (EFTF/IFC), 2019
In this paper, we propose an implementation of the compact laser system for POP rubidium atomic clock. The compact system consists of the miniaturized optical platform and the laser driving and control electronic module, and the two parts with the same length and width are stacked together to ensure the output laser beam is exactly incident to rubidium
Zhijian Yu, Zhijing Du, Kemu Wang, Wenxiang Xue, Yanyan Liu, Yuan Tian, Shougang Zhang   +6 more
openaire   +1 more source

Optimisation of Double Resonance Optically Pumped Rb Atomic Clocks Using a Reconfigurable Physics Package Testbed

European Frequency and Time Forum
The optimisation of a double resonance optically pumped (DROP) rubidium (Rb) atomic clock using a reconfigurable physics package testbed is reported. The testbed can incorporate numerous sizes and variations of the following components: optical sources ...
Nitika Gupta, Hugh Klein, Guilong Huang, Rabia Ince, Nyra Ashraf, Ulas Gokay, Laurence Nicholls, Mohsin Haji   +7 more
semanticscholar   +1 more source

Introducing AI to Atomic Clocks for Improving Holdover

European Frequency and Time Forum
Rubidium holdover clocks must be designed to operate autonomously for months or years without human intervention. However, its long-term stability is affected by component ageing and environmental effects, which cause linear frequency drift as well as ...
Rabia Ince, Mohsin Haji
semanticscholar   +1 more source

Microwave cavity design for an optically-pumped rubidium atomic beam clock

2013 Joint European Frequency and Time Forum & International Frequency Control Symposium (EFTF/IFC), 2013
We design a microwave cavity for our developing compact optically-pumped rubidium beam frequency standard. For clock transition of 87Rb (F=2, mF=0 to F=1, mF=0), the central frequency is 6.8347GHz. The cavity made of WR90 waveguide in previous cesium beam clocks no longer works.
Chang Liu, Yanhui Wang
openaire   +1 more source

Study of the possibility of suppressing the influence of changes in an external magnetic field direction on the relative frequency fluctuations of two rubidium atomic clocks

Radioengineering, 2021
S. Ermak, V. V. Semenov, O. Ermak
semanticscholar   +1 more source

Rubidium Atomic Clock with Improved Metrological Characteristics for Satellite Communication System

2017
One of the essential elements of satellite communication system is an atomic clock. The proper operation of this system depends on the performance of atomic clock. In this paper one of the directions of modernization of the rubidium atomic clocks is considered. A new design of the frequency synthesis circuitry is presented.
Alexander A. Petrov, Vadim V. Davydov, Nikita S. Myazin, Vladislav E. Kaganovskiy   +3 more
openaire   +1 more source

Research on steering atomic time scale based on a remote rubidium fountain clock

Conference on Precision Electromagnetic Measurements
In this work, a rubidium fountain clock through an 84km commercial optical fiber link was used to steer the atomic time scale generated by a clock ensemble with 2 hydrogen masers and 8 high performance cesium clocks.
Deling Zeng, Lizhi Hu, Dongge Huang, Lian Dong, Zhiqiang Han   +4 more
semanticscholar   +1 more source