First-order cancellation of the Cs clock frequency temperature-dependence in Ne-Ar buffer gas mixture

Boudot, Rodolphe; Miletic, D.; Dziuban, P.; Affolderbach, C.; Knapkiewicz, Paweł; Dziuban, Jan; Mileti, G.; Girodano, Vincent; Gorecki, Christophe

doi:10.1364/oe.19.003106

Cited by 13 publications

(8 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One can also cancel the temperature dependence at a chosen temperature by a mixture of gases with temperature coefficients of opposite signs [10,40].…”

Section: B Procedures and Resultsmentioning

confidence: 99%

Temperature and pressure shift of the Cs clock transition in the presence of buffer gases: Ne,N2, Ar

2011

View full text Add to dashboard Cite

The ground-state hyperfine resonance line of alkali-metal atoms is frequency shifted in the presence of noble or molecular gases. The buffer gases used in vapor-cell atomic clocks thus induce a temperature-dependent shift of the clock transition frequency. We report on measurements of the pressure and temperature dependence of the Cs clock transition frequency in the presence of Ne, Ar, and N 2 buffer gases. The pressure in the sealed glass vapor cells is measured by means of the shift of the Cs D 1 line. We have also investigated the temperature dependence of the optical shift. From these measurements, we infer the pressure and temperature coefficients of the hyperfine frequency shift. It is then possible to predetermine gas mixture ratios that cancel the temperature sensitivity at a given temperature. This prediction is confirmed experimentally for Ar-N 2 mixtures. These results can be useful for improving the long-term frequency stability of Cs vapor-cell clocks.

show abstract

“…One can also cancel the temperature dependence at a chosen temperature by a mixture of gases with temperature coefficients of opposite signs [10,40].…”

Section: B Procedures and Resultsmentioning

confidence: 99%

Temperature and pressure shift of the Cs clock transition in the presence of buffer gases: Ne,N2, Ar

2011

View full text Add to dashboard Cite

show abstract

“…The term microvesicle, denoting lipid-membrane-enclosed extracellular particles, goes back (debatably) at least as far as the original EVs, the neuronal synaptic vesicles (22). There has been a trend in the EV field to reserve the term microvesicle for membrane particles released (described variously as shed, blebbed, exfoliated, or exocytosed) directly from the cell’s plasma membrane (39); early publications noted the plasma membrane as the source of these vesiculations (11, 165). The term ectosome, originally used to describe the cortical portion of sponges (12), is also used in reference to vesicles that are directly assembled and released at the plasma membrane (18) and provides another source of confusion (18).…”

Section: Extracellular Vesicles: a Brief And Incomplete History Of Nomentioning

confidence: 99%

Roles of Extracellular Vesicles in High-Grade Gliomas: Tiny Particles with Outsized Influence

Graner

2019

Annu. Rev. Genom. Hum. Genet.

View full text Add to dashboard Cite

High-grade gliomas, particularly glioblastomas (grade IV), are devastating diseases with dismal prognoses; afflicted patients seldom live longer than 15 months, and their quality of life suffers immensely. Our current standard-of-care therapy has remained essentially unchanged for almost 15 years, with little new therapeutic progress. We desperately need a better biologic understanding of these complicated tumors in a complicated organ. One area of rejuvenated study relates to extracellular vesicles (EVs)—membrane-enclosed nano- or microsized particles that originate from the endosomal system or are shed from the plasma membrane. EVs contribute to tumor heterogeneity (including the maintenance of glioma stem cells or their differentiation), the impacts of hypoxia (angiogenesis and coagulopathies), interactions amid the tumor microenvironment (concerning the survival of astrocytes, neurons, endothelial cells, blood vessels, the blood–brain barrier, and the ensuing inflammation), and influences on the immune system (both stimulatory and suppressive). This article reviews glioma EVs and the ways that EVs manifest themselves as autocrine, paracrine, and endocrine factors in proximal and distal intra- and intercellular communications. The reader should note that there is much controversy, and indeed confusion, in the field over the exact roles for EVs in many biological processes, and we will engage some of these difficulties herein.

show abstract

“…They are typically additionally filled with a few ten to a few hundred mbar of buffer gas(es) in order to reduce the atomic resonance linewidth through the Lamb–Dicke effect by reducing the mean freepath of alkali atoms. 14 As a side effect, buffer gas(es) produce an undesired temperature-dependent shift of the clock frequency due to dephasing interactions between the alkali atoms and the buffer gas atoms or molecules. This frequency shift is typically described within the operation temperature range by a second order temperature dependent relation, 15 the sign of which varies according to the specific buffer gas species.…”

Section: Measured Devicesmentioning

confidence: 99%

Quantitative Micro-Raman Spectroscopy for Partial Pressure Measurement in Small Volumes

et al. 2017

View full text Add to dashboard Cite

We demonstrate the quantitative capabilities of Raman confocal microscopy as a nondestructive method to measure the partial pressure of molecular gases in mm range sealed volume having an optical access. Thanks to a calibration procedure, we apply this technique for the characterization of the absolute nitrogen partial pressure inside buffered micro electromechanical system (MEMS) atomic vapor cells developed for atomic clocks. Our results are compared with measurements obtained by rubidium hyperfine frequency spectroscopy and a good agreement is demonstrated between the two methods, with a three-sigma detection limit below 10 mbar for a 1 h integration time, using a 33 mW 532 nm excitation laser. These results prove the potential of confocal micro-Raman spectroscopy as a simple and nondestructive method for small-scale pressure measurements.

show abstract

First-order cancellation of the Cs clock frequency temperature-dependence in Ne-Ar buffer gas mixture

Cited by 13 publications

References 21 publications

Temperature and pressure shift of the Cs clock transition in the presence of buffer gases: Ne,N2, Ar

Temperature and pressure shift of the Cs clock transition in the presence of buffer gases: Ne,N2, Ar

Roles of Extracellular Vesicles in High-Grade Gliomas: Tiny Particles with Outsized Influence

Quantitative Micro-Raman Spectroscopy for Partial Pressure Measurement in Small Volumes

Contact Info

Product

Resources

About