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Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Nanooptik

Oliver Benson, M. Weidinger, M. Löffler, and Herbert Walther (1998)

From Maser to Mazer

Fortschritte der Physik, 46(6):809-816.

In this paper we report on atomic interferometry in the micromaser. The experimentally observed interferences are due to the non-adiabatic mixing of dressed states of the atoms at the entrance and exit holes of the maser cavity, leading to Ramsey-type two-field interaction. The observations are explained on the basis of the micromaser theory. Statistical properties of the maser field are investigated via a measurement of the statistics of the pump atoms that leave the maser cavity. Theoretical expressions for the time dependence of the Fano-Mandel-parameter QA(t) are compared with the experimental data. We demonstrate, that metastability of the maser field and atomic interference strongly influence the approach to a steady state value of QA(t). Furthermore, a theoretical investigation of a maser pumped with ultra-cold atoms is discussed. The interplay between reflection and transmission events of the atoms leads to a photon emission probability that strongly depends on the quantized center-of-mass motion (z-motion) of the atoms. We demonstrate that this mazer operation can be completely different from the ordinary maser pumped by a beam of thermal atoms.