Theodor Wolfgang Hänsch (German pronunciation: [ˈteːodoːɐ̯ ˈhɛnʃ] ; born 30 October 1941) is a German physicist. He received one-fourth of the 2005 Nobel Prize in Physics for "contributions to the development of laser-based precision spectroscopy, including the optical frequency comb technique", sharing the prize with John L. Hall and Roy J. Glauber.
Hänsch is Director of the Max-Planck-Institut für Quantenoptik (quantum optics) and Professor of experimental physics and laser spectroscopy at LMU Munich in Munich, Bavaria, Germany.
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