Theodor des Coudres (13 March 1862 in Veckerhagen, Weser – 8 October 1926 in Leipzig) was a German physicist.
[1] In 1881 des Coudres began to study natural science and medicine at the University of Geneva and later in Leipzig and Munich.
At the Humboldt University of Berlin in 1887, he successfully finished his study with a thesis on the optical constants of mercury with Professor Hermann von Helmholtz.
The publisher Georg Hirzel and the physicist Otto Wiener wrote noteworthy obituaries on Theodor des Coudres.
Des Coudres worked among other things on metal reflection, the Kerr effect, high pressure physics, and he was the first to determine the specific charge and the speed of alpha particles.