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Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)

Progress on a Surface-Electrode Ion Trap for Optical Frequency Metrology

Marion Delehaye, Y. Kersalé, Clément Lacroûte, Lucas Groult, T. Lauprêtre, Ashok Kumar, Bachir Achi, Maël Souidi, Emmanuel Bigler, Jacques Millo, P.Y. Bourgeois

Published Apr 1, 2019• 0 citations
Publisher

Abstract

We present our latest results obtained with a surface-electrode ion trap designed for optical frequency metrology. A prototype trap, based on a simple geometry realized on a printed-circuit board, has been successfully used to trap single Yb+ions. Our long-term goal is the realization of a compact single-ion optical clock.
DOI
10.1109/fcs.2019.8856116

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We present the design of a compact optical clock based on the 2 S 1/2 → 2 D 3/2 435.5 nm transition in 171 Yb + . The ion trap will be based on a micro-fabricated circuit, with surface electrodes generating a trapping potential to localize a single Yb ion a few hundred μ m from the electrodes. We present our trap design as well as simulations of the resulting trapping pseudo-potential. We also present a compact, multi-channel wavelength meter that will permit the frequency stabilization of the cooling, repumping and clear-out lasers at 369.5 nm, 935.2 nm and 638.6 nm needed to cool the ion. We use this wavelength meter to characterize and stabilize the frequency of extended cavity diode lasers at 369.5 nm and 638.6 nm.
We report on the progress on a single-ion optical clock that is being developed at the FEMTO-ST institute. Our objective is to reach a fractional frequency stability of the order of 10-14 at one second for a total volume well below 500 L. The experimental setup is based on a surface electrode single-ion trap. A new trapping chip was designed and produced at the local cleanroom facility, using deep reactive-ion etching (DRIE) on a silicon on insulator- (SOI) wafer. Paul traps require a source of highly-stable and low noise voltage in the radio-frequency (RF) domain. A resonator of our own design has been used to supply high voltage to the trap. We have developed and implemented techniques for 3D micromotion reduction in order to minimize the 2nd order Doppler shift. Indeed, for Yb+ optical spectroscopy, second order Doppler shift and Stark shift due to the ac fields can contribute significantly to the uncertainty budget. We will present the latest results of the trap characterization, which should include lifetime and heating rate measurements of the trap.
Abstract We are developing a single-ion optical clock based on a surface-electrode (SE) trap that we will operate with 171Yb+ ions on the electric quadrupole transition at 435.5 nm. We present heating rate measurements performed with a prototype SE trap. We also introduce a new, micro-fabricated SE trapping chip using silicon on insulator technology. Electric tests were performed under ultra-high vacuum using a testing chip, including breakdown voltages measurements and flashover detection. We present suitable trapping parameters for this chip, as well as a road-map for improving its design.