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[PAST EVENT] Gleb V. Romanov: Physics Dissertation Defense
April 3, 2017
10am - 1pm
Abstract:
Realizations of strong coupling between an optical field and an ensemble of atoms using two-photon processes - such as electromagnetically induced transparency (EIT) - offer a simple method for group velocity manipulation for classical and quantum fields, which is essential for applications such as slow and stored light. The EIT effect relies on the strong coupling of an optical probe field and a collective long-lived ensemble of atomic spins by means of a strong classical optical control field in a Lambda configuration. Since the strength of such interaction is proportional to the number of atoms, the optimal performance often requires operation in a high optical depth regime. Unfortunately, the increasing optical depth of the atomic ensemble also leads to effective enhancement of other nonlinear light-atom interactions, such as the four-wave mixing effect. Here we discuss the possibility to control four-wave mixing in a three-level system without deteriorating the coherent properties of EIT by introducing an additional absorber resonant exclusively with the Stokes field.
Bio:
Gleb Romanov was born in Moscow, Russia. He got his B.S. in Physics from the Moscow Engineering Physics Institute (MEPhI) in 2009. He then moved to Williamsburg, where he started working with Dr. Irina Novikova at William & Mary. His studies focused on multi-photon coherent interactions in Rubidium atoms.
Realizations of strong coupling between an optical field and an ensemble of atoms using two-photon processes - such as electromagnetically induced transparency (EIT) - offer a simple method for group velocity manipulation for classical and quantum fields, which is essential for applications such as slow and stored light. The EIT effect relies on the strong coupling of an optical probe field and a collective long-lived ensemble of atomic spins by means of a strong classical optical control field in a Lambda configuration. Since the strength of such interaction is proportional to the number of atoms, the optimal performance often requires operation in a high optical depth regime. Unfortunately, the increasing optical depth of the atomic ensemble also leads to effective enhancement of other nonlinear light-atom interactions, such as the four-wave mixing effect. Here we discuss the possibility to control four-wave mixing in a three-level system without deteriorating the coherent properties of EIT by introducing an additional absorber resonant exclusively with the Stokes field.
Bio:
Gleb Romanov was born in Moscow, Russia. He got his B.S. in Physics from the Moscow Engineering Physics Institute (MEPhI) in 2009. He then moved to Williamsburg, where he started working with Dr. Irina Novikova at William & Mary. His studies focused on multi-photon coherent interactions in Rubidium atoms.