Hannover 2020 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 21: Ultracold plasmas and Rydberg systems I (joint session Q/A)
A 21.2: Vortrag
Mittwoch, 11. März 2020, 14:15–14:30, f342
Self-Induced Transparency in Room-Temperature Dense Rydberg Gases — •Zhengyang Bai1,2, Weibin Li1, and Guoxiang Huang2 — 1School of Physics and Astronomy, and Centre for the Mathematics and Theoretical Physics of Quantum Non-equilibrium Systems, University of Nottingham, Nottingham, NG7 2RD, UK — 2State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
Aggressively large Doppler effects is of the challenge to create static optical nonlinearities in atomic gases beyond ultracold temperatures. We show the creation of strong dispersive optical nonlinearities of nanosecond laser pulses in high number density atomic gases at room temperature. This is examined in a vapor cell setting where the laser light resonantly excites atoms to Rydberg P states through a single-photon transition. Using fast Rabi flopping and strong Rydberg atom interactions, both in the order of GHz, can overcome the Doppler effect as well as dephasing due to thermal collisions between Rydberg electrons and surrounding atoms. In this strong-driving regime both the light intensity and Rydberg interactions contribute to the generation of the optical nonlinearity. We show the emergence of a modified self-induced transparency (SIT) where the stable light propagation relies on the Rydberg interactions. We identify quantitatively that the SIT occurs at smaller (than 2π) pulse areas for higher Rydberg states. We furthermore demonstrate that a conditional optical phase gate can be implemented by harvesting strong Rydberg atom interactions and SIT.