Accurate determination of an alkali-vapor-inert-gas diffusion coefficient using coherent transient emission from a density grating

Alexander Pouliot; Gehrig Carlse; Thomas Vacheresse; Anantharaman Kumarakrishnan

doi:10.1117/12.2616878

2 March 2022 Accurate determination of an alkali-vapor-inert-gas diffusion coefficient using coherent transient emission from a density grating

Alexander Pouliot, Gehrig Carlse, Thomas Vacheresse, Anantharaman Kumarakrishnan

Author Affiliations +

Proceedings Volume 12016, Optical and Quantum Sensing and Precision Metrology II; 120160Q (2022) https://doi.org/10.1117/12.2616878
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

We demonstrate a technique for the accurate measurement of diffusion coefficients for alkali vapor in an inert buffer gas. The measurement was performed by establishing a spatially periodic density grating in isotopically pure ⁸⁷Rb vapor and observing the decaying coherent emission from the grating due to the diffusive motion of the vapor through N₂ buffer gas. We obtain a diffusion coefficient of 0.245 ± 0.002 cm² /s at 50°C and 564 Torr. Scaling to atmospheric pressure, we obtain D₀ = 0.1819 ± 0.0024 cm² /s. To the best of our knowledge, this represents the most accurate determination of the Rb-N2 diffusion coefficient. Our measurements can be extended to different buffer gases and alkali vapors used for magnetometry and can be used to constrain theoretical diffusion models for these systems

Conference Presentation

Citation Download Citation

Alexander Pouliot, Gehrig Carlse, Thomas Vacheresse, and Anantharaman Kumarakrishnan "Accurate determination of an alkali-vapor-inert-gas diffusion coefficient using coherent transient emission from a density grating", Proc. SPIE 12016, Optical and Quantum Sensing and Precision Metrology II, 120160Q (2 March 2022); https://doi.org/10.1117/12.2616878

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available