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Rev Sci Instrum. 2015 Nov;86(11):113306. doi: 10.1063/1.4934873.

Generation of neutral atomic beams utilizing photodetachment by high power diode laser stacks.

The Review of scientific instruments

A P O'Connor, F Grussie, H Bruhns, N de Ruette, T P Koenning, K A Miller, D W Savin, J Stützel, X Urbain, H Kreckel

Affiliations

  1. Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany.
  2. Columbia Astrophysics Laboratory, Columbia University, New York, New York 10027, USA.
  3. Dilas Diode Laser, Inc., Tucson, Arizona 85715, USA.
  4. Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, Louvain-la-Neuve B-1348, Belgium.

PMID: 26628128 DOI: 10.1063/1.4934873

Abstract

We demonstrate the use of high power diode laser stacks to photodetach fast hydrogen and carbon anions and produce ground term neutral atomic beams. We achieve photodetachment efficiencies of ∼7.4% for H(-) at a beam energy of 10 keV and ∼3.7% for C(-) at 28 keV. The diode laser systems used here operate at 975 nm and 808 nm, respectively, and provide high continuous power levels of up to 2 kW, without the need of additional enhancements like optical cavities. The alignment of the beams is straightforward and operation at constant power levels is very stable, while maintenance is minimal. We present a dedicated photodetachment setup that is suitable to efficiently neutralize the majority of stable negative ions in the periodic table.

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