Director: Prof. Dr. Theodor W. Hänsch

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Are fundamental constants really constant? Are there detectable differences between matter and antimatter? How well can quantum mechanics describe simple hydrogen-like atoms and ions? Are there limits to the possible accuracy of optical atomic clocks? Could one build an x-ray atomic clock? How far can precise laser spectroscopy of cold trapped ions be extended into the extreme ultraviolet? Can experiments with ultracold atomic bosons and fermions lead to unexpected novel states of correlated quantum matter? What can we do with a quantum laboratory on a micro-fabricated atom chip? These are some of the questions explored by the Laser Spectroscopy Division.

 

Our current research is focused on precise laser spectroscopy of simple atomic systems and on the quantum physics of ultracold atoms. The affiliated experimental quantum physics group of Professor Harald Weinfurter is exploring novel systems of entangled photons and practical applications such as quantum cryptography. The Junior Research Group of Dr. Tobias Kippenberg has begun to study novel photonic phenomena in microscopic ring resonators.

 

The exploration of the interaction of light with atomic matter provides a fascinating window into the microscopic quantum world. Laser spectroscopy touches on the foundations of physics and it can lead to unexpected new technologies and applications. For many years, we have used lasers and optoelectronic technologies to invent and develop experimental tools which open new opportunities for fundamental discoveries. Past accomplishments of Professor Hänsch and his team include precise measurements of fundamental constants by laser spectroscopy of atomic hydrogen, the invention of laser cooling, the first continuous wave atom laser, the first realization of an atomic Bose-Einstein condensate on a microfabricated atom chip, and the first realization of a strongly correlated atomic quantum gas, the 'Mott insulator'. In 2005, Theodor W. Hänsch and John L. Hall shared one half of the Nobel Prize in Physics “for their contributions to laser-based precision spectroscopy, including the optical frequency comb technique”.

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