Hanle effect

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The Hanle effect is a reduction in the polarization of light when the atoms emitting the light are subject to a magnetic field in a particular direction, and when they have themselves been excited by polarized light.

It is named after Wilhelm Hanle, who first described it in Zeitschrift für Physik in 1924.[1] Attempts to understand the phenomenon were important in the subsequent development of quantum physics. [2]



  1. ^ Hanle, Wilhelm (1924-12-01). "Über magnetische Beeinflussung der Polarisation der Resonanzfluoreszenz". Zeitschrift für Physik (in German). 30 (1): 93–105. Bibcode:1924ZPhy...30...93H. doi:10.1007/bf01331827. ISSN 0044-3328.
  2. ^ J Alnis; K Blushs; M Auzinsh; S Kennedy; N Shafer-Ray; E R I Abraham (2003). "The Hanle effect and level crossing spectroscopy in Rb vapour under strong laser excitation" (PDF). Journal of Physics B. 36: 1161–1173. Bibcode:2003JPhB...36.1161A. doi:10.1088/0953-4075/36/6/307.