Skip to main content
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.

Enhanced Magnetic Trap Loading for Atomic Strontium



Gretchen K. Campbell, Daniel Barker, Benjamin Reschovsky, Neal Pisenti


We report on a technique to improve the continuous loading of atomic strontium into a magnetic trap from a Magneto-Optical Trap (MOT). This is achieved by adding a depumping laser tuned to the 3 P1 → 3 S 1 (688-nm) transition. The depumping laser increases atom number in the magnetic trap and subsequent cooling stages by up to 65 % for the bosonic isotopes and up to 30 % for the fermionic isotope of strontium. We optimize this trap loading strategy with respect to 688-nm laser detuning, intensity, and beam size. To understand the results, we develop a one-dimensional rate equation model of the system, which is in good agreement with the data. We discuss the use of other transitions in strontium for accelerated trap loading and the application of the technique.
Physical Review A


laser cooling, ultracold atoms


Campbell, G. , Barker, D. , Reschovsky, B. and Pisenti, N. (2015), Enhanced Magnetic Trap Loading for Atomic Strontium, Physical Review A, [online], (Accessed April 14, 2024)
Created October 26, 2015, Updated June 2, 2021