title: Optics. In optical pumping, less can be more.
authors.affiliation: Max Planck Institute for the Science of Light & Institute for Optics, Information and Photonics, Friedrich-Alexander University of Erlangen-Nuremberg, 91058 Erlangen, Germany. harald.schwefel@mpl.mpg.de.
authors.forename: Harald G L
authors.initials: HG
authors.lastname: Schwefel