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International Conference on Control, Instrumentation, Energy & Communication

Automation of an optical frequency standard experiment

Neha Batra, Atish Roy, C. Samal, S. Majhi, Subhasis Panja, Subhadeep De

Published Jan 1, 2016• 3 citations
Publisher

Abstract

We are developing the first optical frequency standard in India with single ytterbium ion (171Yb+), which is confined and laser cooled in an ion trap. This precision clock experiment needs to be automated for running it reliably and continuously over few days. For this we are developing a computer control systems. Some of its supporting hardware modules have already been designed and tested. In this article we describe scheme of our automation and control system.

DOI
10.1109/ciec.2016.7513823

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•Jan 1, 2019•1 citation
We are developing the first optical frequency standard in India with single ytterbium ion (171Yb+), which is confined and laser cooled in an ion trap. This precision clock experiment needs to be automated for running it reliably and continuously over few days. For this we are developing a computer control systems. Some of its supporting hardware modules have already been designed and tested. In this article we describe scheme of our automation and control system.
By measuring the frequencies emitted as atoms transition between energy levels, atomic frequency standards are among the most advanced devices available for keeping time. Here, we report our recent progress in developing an optical frequency standard based on a single171Yb+. With the laser Doppler cooling, a single ytterbium ion is cooled to crystallization and the temperature of the ion crystal is estimated to be below 1 mK. The progress reported in this paper is the first step of the project and paves the way for future development.
An optical clock or frequency standard based on the interrogation of an atomic transition in the optical domain, operates at ~1014Hz is capable of providing orders of magnitude better accuracy than the present primary standard of frequency or time operating in the microwave range. Optical transitions of an ions, confined within a radio frequency ion trap and laser cooled to ~mK temperature, provides better long term stability since they are free from Coulomb and intra-atomic interactions. Optical frequency standards have been realized with several ions, e.g.,199Hg+,171Yb+,115In+,88Sr+,40Ca+,27Al+and among those171Y+has multiple ultra-narrow optical transitions suitable for serving as frequency standards [1-2].
Optical frequency standards based on narrow absorptions in laser-cooled single trapped ions have recently begun to demonstrate stabilities that are competitive with cold atom fountain microwave standards. This paper presents a short review of the wider state-of-the-art development of these single cold trapped ion frequency standards, coupled with a more detailed account of recent results achieved at National Physical Laboratory in respect of single ion systems based on 88Sr+, 87Sr+ and 171Yb+. Narrow linewidth data for the optical clock quadrupole and octupole transitions respectively at 674 nm in 88Sr+ and 467 nm in 171Yb+, are presented, together with a discussion of current systematics and future projections. The potential for optical clock operation is outlined.