Research Area 11: ARO Special Programs/Short Term Innovative Research (STIR) Program: Creating and Controlling THz Superradiance in an Ultracold Gas
Abstract
Major Goals: The major goal of this project is to study the field suppression of THz superradiance. Specifically, we studied the electric field suppression of superradiance. With ARO support, we studied the electric field suppression of superradiance in Rydberg atoms [4]. In order to do the Rydberg excitations, we studied the excitation lasers. We replaced the reflective grating in a standing-wave external cavity laser by a transmission grating, so that the laser output direction wont change if the frequency need to be changed [3]. This is essential for Rydberg excitations, in which case, the laser frequency need to be adjusted frequently. Moreover, we studied laser amplification to achieve high laser power [6]. We studied electric field suppression of superradiance [4]. Superradiance is caused macroscopic dipole composed by atomic dipoles. We discovered that the superradiance could be suppressed. In addition, as the atomic density increases, the superradiance is harder to suppress. We also did calculations about dipole-dipole interactions, and studied the dipole-dipole effects on the superradiance formation [1,2,5]. We have also tried to using the magnetic field to suppress superradiance. However, the challenge was to create and switch uniform magnetic field. We now able to create uniform field, and ready to carry out the magnetic field suppression experiment.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 30, 2017
- Accession Number
- AD1210407
Entities
People
- Jianing Han
Organizations
- University of South Alabama