Electromagnetically induced transparency in rubidium: An advanced undergraduate laboratory

POSTER

Abstract

Electromagnetically induced transparency (EIT) can be used to modify the optical response of an atomic medium to a resonant laser field. In EIT, a non-resonant pump laser beam can result in the reduction of absorption of a weak, resonant probe laser beam, provided the fields are coherently coupled by a common state. EIT provides a unique means of coherently controlling photons and has potential applications in fields ranging from quantum computing to telecommunications. In this advanced laboratory we describe the theory and experiment for investigating ladder-type EIT in rubidium gas. The theoretical absorption profile of a weak probe laser beam tuned across the 5S 1/2 to 5P 3/2 transition (780.2 nm) is modeled in the presence of a strong coupling laser beam tuned to the 5P 3/2 to 5D 5/2 transition (776.0 nm) and the absorption transparency window is characterized. Using grating-feedback diode lasers, we observe EIT experimentally in rubidium gas and compare the results to the theoretical model. Applications of EIT to high-resolution two-photon spectroscopy are also discussed. This laboratory uses much of the same equipment as the saturated absorption experiment commonly performed on the D2 line in rubidium, so it is easily implemented in laboratories with the equipment to conduct that experiment.

Authors

  • Shannon Mayer

    University of Portland

  • Ernest Henley

    Green River College, University of British Columbia, Pacific Northwest National Laboratory, BYU-Idaho Dept. of Physics, University of Washington, Applied Physics Technologies, Inc., Montana State University, Universidade Estadual de Campinas, Southern Oregon University, Oregon State University Department of Physics, Oregon State University Department of Chemistry, National Institute of Standards and Technology Center for Neutron Research, Physics Department, Oregon State University, University of Idaho, University of Wyoming, Department of Physics, Montana State University, University of Portland, Idaho State University, WWU, Advanced Light Source, Lawrence Berkeley National Laboratory, Oregon Center for Optics and Department of Physics, University of Oregon, Lewis and Clark, Queen's University, University of Notre Dame, Idaho National Lab, TRIUMF, RCNP, Japan, University of Guelph, Mexico University, St. Mary's University, University of Montreal, Deep River, Dept. of Physics; Montana State University, Dept. of Plant Sciences and Pathology, Dept. of Chem. and Biochem.; Montana State University, Department of Physics, Shandong University, P. R. China, Department of Physics, University of Idaho, USA, Dept. of Physics, Simon Fraser University, Burnaby, BC V5A 1S6 Canada, University of Calgary