Gold microdiscs as alkali preferential condensation spots for cell clock long-term frequency improvement

Karlen, Sylvain; Overstolz, T.; Gobet, J.; Haesler, Jacques; Droz, Fabien; Lecomte, Steve

doi:10.1109/eftf.2018.8409005

Cited by 6 publications

(3 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The alkali vapor cells are typically implemented using two different technologies: the first fabrication method is glass blowing; the second, more flexible method utilizes technology from the area of micro-electromechanical systems (MEMS). Such MEMS cells allow for higher reproducibility and miniaturized system integration because of their basic thin-film fabrication technology in comparison to glass-blown cells [2,3].…”

Section: Introductionmentioning

confidence: 99%

Integration of Passivated Gold Mirrors into Microfabricated Alkali Vapor Cells

Wittkämper,

Scholtes,

Linzen

et al. 2023

Coatings

View full text Add to dashboard Cite

Measurements of weak magnetic fields demand a small distance between the sensor and the to-be-measured object. Optically pumped magnetometers (OPMs) utilize laser light and the Zeeman effect in alkali vapor cells to measure those fields. OPMs can be used in transmission or reflection geometry. A minimization of the distance between active volume and magnetized source calls for reflection geometry with integrated mirrors. Unfortunately, cesium reacts chemically with most materials, especially high-performing materials, such as gold. Herein, we show the first functional OPM cell using a gold mirror inside the cell. We fabricated the gold mirrors with and without a passivation layer in order to evaluate the feasibility of expanding on the limited list of possible mirror materials. A comparison of this implementation revealed that mirrors without a passivation layer only reach a reflectivity of about 6% while mirrors with a passivation layer retain reflectivity values of about 90% in the visible light to near-infrared spectrum. This result and the proof of elemental cesium in the alkali vapor cell demonstrates the feasibility of passivated gold mirrors for applications in alkali vapor cells for OPMs.

show abstract

Section: Introductionmentioning

confidence: 99%

Integration of Passivated Gold Mirrors into Microfabricated Alkali Vapor Cells

Wittkämper,

Scholtes,

Linzen

et al. 2023

Coatings

View full text Add to dashboard Cite

show abstract

“…Other sophisticated methods include the active stabilization of a specific laser microwave modulation index that reduces laser power-induced frequency instabilities 3,5,[8][9][10] , possibly combined with the compensation for the laser aging 6 , or the implementation of advanced tailored interrogation sequences using laser power modulation 11 . Deposition of gold micro-discs, used as privileged alkali condensation spots onto the cell windows was also shown to avoid the progressive obstruction of the transmitted laser light 12 . An alternative and straightforward approach to mitigate light-shifts in CPT clocks is to probe the clock transition with Ramsey spectroscopy 13,14 .…”

mentioning

confidence: 99%

“…3(b), obtained in Ramsey and SABR cases, exhibit opposite signs. We have also checked that the temperature dependence of the buffer gas collisional shift 33,34 , the Zeeman shift, barometric effects 35 or alkali condensation on the cell windows 12 could not explain the measured stability level at 1 day. To date, the clock stability limitation at 1 day on this setup is suspected to come from a possible unstable cell inner atmosphere.…”

mentioning

confidence: 99%

Light-shift mitigation in a microcell-based atomic clock with Symmetric Auto-Balanced Ramsey spectroscopy

Hafiz,

Carlé,

Passilly

et al. 2021

Preprint

View full text Add to dashboard Cite

Micro-fabricated components for cold atom sensors

McGilligan

Gallacher

Griffin

et al. 2022

Review of Scientific Instruments

View full text Add to dashboard Cite

Laser cooled atoms have proven transformative for precision metrology, playing a pivotal role in state-of-the-art clocks and interferometers and having the potential to provide a step-change in our modern technological capabilities. To successfully explore their full potential, laser cooling platforms must be translated from the laboratory environment and into portable, compact quantum sensors for deployment in practical applications. This transition requires the amalgamation of a wide range of components and expertise if an unambiguously chip-scale cold atom sensor is to be realized. We present recent developments in cold-atom sensor miniaturization, focusing on key components that enable laser cooling on the chip-scale. The design, fabrication, and impact of the components on sensor scalability and performance will be discussed with an outlook to the next generation of chip-scale cold atom devices.

show abstract

Gold microdiscs as alkali preferential condensation spots for cell clock long-term frequency improvement

Cited by 6 publications

References 7 publications

Integration of Passivated Gold Mirrors into Microfabricated Alkali Vapor Cells

Integration of Passivated Gold Mirrors into Microfabricated Alkali Vapor Cells

Light-shift mitigation in a microcell-based atomic clock with Symmetric Auto-Balanced Ramsey spectroscopy

Micro-fabricated components for cold atom sensors

Contact Info

Product

Resources

About