Bulletin of the American Physical Society
2015 Annual Meeting of the APS Mid-Atlantic Section
Volume 60, Number 14
Friday–Sunday, October 23–25, 2015; Morgantown, West Virginia
Session C2: Strong and Pulsed Optical Fields |
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Chair: Kenneth O'Hara, Pennsylvania State University Room: Morgantown Marriott Salon B |
Sunday, October 25, 2015 9:36AM - 9:48AM |
C2.00001: Collective Phases of Strongly Interacting Cavity Photons Invited Speaker: Ryan Wilson Motivated by recent experimental advances with coupled arrays of non-linear photonic cavities, we study the steady state phases of the Bose-Hubbard model in the presence of dissipation and coherent driving. Using a site-decoupled mean-field approximation, we identify phases with antiferromagnetic and incommensurate density wave spatial order, in addition to limit cycle phases, where oscillatory population dynamics persist indefinitely. We also identify collective optically bistable phases, where the system supports two stable steady states among spatially uniform, antiferromagnetic, and limit cycle phases. Further, we employ exact quantum calculations for one dimensional arrays of cavities, using quantum trajectory and density matrix renormalization group methods. These methods produce phases with short-range antiferromagnetic and density wave correlations, agreeing surprisingly well with the mean-field predictions. Interestingly, the quantum trajectories simulations exhibit real-time collective switching between the classical steady states. We provide a clear physical picture for these dynamics, and relate the switching times to properties of the exact quantum density matrix. [Preview Abstract] |
Sunday, October 25, 2015 9:48AM - 10:00AM |
C2.00002: Ionization modulation from interference of phase-locked ultrafast pulse pairs David Foote, Kevin Lehr, Wendell Hill We have performed two distinct multiphoton ionization experiments of xenon using 800 nm, twin-peaked pulses, each of which were nominally 75 fs in duration. In each experiment, the separation and relative phase of the peaks could be adjusted. In both cases, a 2$\pi$-periodic variation of Xe$^+$ yield was observed as a function of the relative phase. Two different mechanisms that can lead to such a modulation have been considered: optical interference of the two peaks and electron-wavepacket interference between the electrons liberated by each peak, similar to what was observed for single-photon ionization of potassium [1]. To this end, we extended the theory of [1] to the multiphoton case. Details of our experimental results and numerical simulations will be presented along with what these results mean for control experiments. [1] M. Wollenhaupt et al., Phys. Rev. Lett. 89, 173001 (2002). [Preview Abstract] |
Sunday, October 25, 2015 10:00AM - 10:12AM |
C2.00003: Creating optical waveguides in air using ultrashort laser pulses Invited Speaker: Jared Wahlstrand We show that intense ultrashort optical pulses can be used to create optical waveguides in the air [1]. By harnessing the acoustic and thermal response of the gas to the nonlinear deposition of energy by the laser beam, we have created optical waveguides with lifetimes of milliseconds. We have used these to guide high average power laser beams and to collect and guide fluorescence, useful in many remote sensing schemes [2]. We find that two-photon rotational absorption is an important channel for energy deposition by ultrashort pulses in air and, using quantum control of molecular rotational states, we have shown that this rotational absorption can be greatly enhanced [3]. [1] N. Jhajj, E. W. Rosenthal, R. Birnbaum, J. K. Wahlstrand, and H. M. Milchberg, Phys. Rev. X 4, 011027 (2014). [2] E. W. Rosenthal, N. Jhajj, J. K. Wahlstrand, and H. M. Milchberg, Optica 1, 5 (2014). [3] S. Zahedpour, J. K. Wahlstrand, and H. M. Milchberg, Phys. Rev. Lett. 112, 143601 (2014). \\ \\ In collaboration with Nihal Jhajj, Eric Rosenthal, Sina Zahedpour, Howard Milchberg - University of Maryland. [Preview Abstract] |
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