Bulletin of the American Physical Society
55th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Monday–Friday, June 3–7, 2024; Fort Worth, Texas
Session X07: Nonlinear Optics
8:00 AM–10:00 AM,
Friday, June 7, 2024
Room: 203A
Chair: Hung Hoang, Department of Physics, Kansas State University
Abstract: X07.00003 : Coherent initiation of superfluorescence by a weak continuous laser field
8:24 AM–8:36 AM
Presenter:
Kenta Kitano
(Aoyama Gakuin University)
Authors:
Kenta Kitano
(Aoyama Gakuin University)
Haruka Maeda
(Aoyama Gakuin University)
Using a femtosecond laser as the pump beam source, rubidium (Rb) atoms in a heated glass cell were excited from the 5S ground state to the 6P state. The superfluorescence fields at 2.73 μm and 1.37 μm were emitted in a cascade decay from the 6P to 6S to 5P state, with a coherent light at 780 nm emitted by the nonlinear polarization generated between the 5P and 5S states. The emission process was a fast phenomenon that took less than 1 ns to complete, and we measured the time profiles of the three emissions with a sufficient temporal resolution by applying sum frequency generation spectroscopy. In order to control the superfluorescence at 1.37 μm, we irradiated a CW laser light resonant with the superfluorescence as a seed light. The results demonstrated that the 1.37-μm superfluorescence was coherently driven by the seed light. At the same time, the instantaneous intensity of the seed light was coherently amplified by 7 orders of magnitude by the superfluorescence, indicating that the superfluorescence can serve as a quantum optical amplifier.
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