NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.

Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.

U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PUBLICATIONS

Lambda-enhanced gray molasses in a tetrahedral laser beam geometry

Published

Author(s)

Daniel Barker, Eric Norrgard, Nikolai Klimov, James A. Fedchak, Julia Scherschligt, Stephen Eckel

Abstract

We report observation of sub-Doppler cooling of lithium using an irregular-tetrahedral laser beam arrangement, which is produced by a nanofabricated diffraction grating. We are able to capture 11(2) % of the lithium atoms from a grating magneto-optical trap into Lambda-enhanced D1 gray molasses. The molasses cools the captured atoms to a radial temperature of 60(9) uK and an axial temperature of 23(3) uK. In contrast to results from conventional counterpropagating beam configurations, we do not observe cooling when our optical fields are detuned from Raman resonance. An optical Bloch equation simulation of the cooling dynamics agrees with our data. Our results show that grating magneto-optical traps can serve as a robust source of cold atoms for tweezer-array and atom-chip experiments, even when the atomic species is not amenable to sub-Doppler cooling in bright optical molasses.
Citation
Optics Express
Volume
30
Issue
6
Pub Type
Journals

Download Paper

https://doi.org/10.1364/OE.444711
Local Download

Keywords

laser cooling, optical molasses, optical Bloch equations, cold core technology, cold atom vacuum standard
Atomic / molecular / quantum

Citation

Barker, D. , Norrgard, E. , Klimov, N. , Fedchak, J. , Scherschligt, J. and Eckel, S. (2022), Lambda-enhanced gray molasses in a tetrahedral laser beam geometry, Optics Express, [online], https://doi.org/10.1364/OE.444711, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=933181 (Accessed October 17, 2025)

Issues

If you have any questions about this publication or are having problems accessing it, please contact [email protected].

Created March 14, 2022, Updated November 29, 2022
Was this page helpful?