Bulletin of the American Physical Society
Annual Meeting of the APS Four Corners Section
Volume 62, Number 17
Friday–Saturday, October 20–21, 2017; Fort Collins, CO
Session E1: Atomic, Molecular and Optical Physics II |
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Chair: Jacob Roberts, Colorado State University Room: Lory Student Center 376 |
Friday, October 20, 2017 1:20PM - 1:44PM |
E1.00001: Comb Spectroscopy of Laser-Induced Plasma Invited Speaker: Jason Jones Dual-comb spectroscopy has become a powerful spectroscopic technique in applications that rely on its broad spectral coverage combined with high accuracy and high frequency resolution capabilities. Experiments have primarily focused on high-sensitivity detection and analysis of gas samples under semi-static conditions, with applications ranging from environmental monitoring of greenhouse gases to high-resolution molecular spectroscopy. Here, we utilize its ability for rapid detection of transient phenomena to demonstrate broadband, high-resolution, and time-resolved spectroscopy in laser-induced plasmas. Laser-induced plasmas provide a versatile and non-contact means to apply the powerful tools of optical spectroscopy in the analysis of solid materials. This new spectroscopic approach offers the broad spectral coverage found in the powerful techniques of laser-induced breakdown spectroscopy while providing the high-resolution and accuracy of cw laser-based spectroscopies. [Preview Abstract] |
Friday, October 20, 2017 1:44PM - 1:56PM |
E1.00002: Analysis of Absorption Time Delays in Streaking of Resonant and Nonresonant Two-Photon Ionization Cory Goldsmith, Jing Su, Agnieszka Jaron-Becker, Andreas Becker The development of attosecond pulses has allowed for probing fundamental processes, such as photoionization, at the natural timescale of the electron. One of the techniques is the attosecond streaking method, in which the momentum of the photoelectron is measured as a function of the time delay between the ionizing attosecond XUV pulse and a weak femtosecond infrared pulse which streaks the momentum of the photoelectron. TDSE simulations show that for one-photon ionization the transition in the continuum is instantaneous whereas for resonant two-photon ionization there exists an absorption delay. We present results that show that the absorption delay varies with the central frequency of the ionizing pulse in the vicinity of an isolated resonance. A perturbative model formula captures the main features of the numerical results for the absorption delay. This work was primarily supported by a grant from the Department of Energy. [Preview Abstract] |
Friday, October 20, 2017 1:56PM - 2:08PM |
E1.00003: Ionization Dynamics in Intense Bicircular Laser Fields Jan Chaloupka The strong-field ionization of helium in two-color, circularly polarized intense laser fields is analyzed with a classical ensemble approach. This \textit{ab initio} technique models the interaction of an ultrashort laser pulse with a completely classical model atom, giving impressive physical and intuitive insight into the dynamics of the ionization process. It is found that counterrotating fields produce significant nonsequential double-ion yield through rescattering and drive novel ionization dynamics. The pathways to double ionization can be modified by altering the relative intensities of the two colors, allowing for unique control of strong-field processes that is not possible with linearly polarized fields. An enhancement in the single ionization yield is also observed, providing a unique and clear signature of rescattering in the single ionization process. [Preview Abstract] |
Friday, October 20, 2017 2:08PM - 2:20PM |
E1.00004: In situ temperature mapping of high energy, high average power cryogenic amplifiers. Han Chi, Kristian Dehne, Cory Baumgarten, Hanchen Wang, Liang Yin, Brendan Reagan, Jorge Rocca Heat generation is a key obstacle to scale high energy solid state laser amplifiers to the multi-kilowatt average powers required for several applications. A leading approach to overcome this limitation is cryogenic cooling of the gain media. Accurate measurements of the temperature profiles within the laser active medium are vital for engineering new amplifier geometries and improving cooling techniques. However, methods to map the temperature of high average power amplifiers operating at cryogenic temperatures have not been available. In this work, by using a neural network to analyze the 1015 nm to 1029 nm fluorescence generated by a 940 nm diode laser, we demonstrate an accurate, in situ, noninvasive optical technique to generate two dimensional (2-D) maps of the temperature profile within cryogenic Yb-doped amplifiers operating at high average power. The effect on the temperature profile under different pump powers and cooling interface conditions is also presented. [Preview Abstract] |
Friday, October 20, 2017 2:20PM - 2:32PM |
E1.00005: Reduced phase noise in an erbium frequency comb via intensity noise suppression Adam Brandt, Samuel Cooper, Zakary Burkley, Dylan Yost There is currently a demand for low noise erbium fiber frequency combs due to their low cost, alignment free nature, and insensitivity to environmental perturbations. Due to the correlation between the light amplitude and phase in optical fiber, active reduction of amplitude noise often also reduces the phase noise of the comb. In this talk, I will discuss our implementation of this technique for a frequency comb based on a slow saturable absorber mode-locked, erbium fiber frequency comb. We believe this technique is applicable to frequency combs based upon other mode-locking mechanisms, such as nonlinear polarization rotation and nonlinear optical loops, and therefore represents a general technique to improve the performance of fiber based frequency combs. [Preview Abstract] |
Friday, October 20, 2017 2:32PM - 2:44PM |
E1.00006: A path from fractional Schr\"{o}dinger equation to design and discovery of novel quantum materials Gavriil Shchedrin, Anastasia Gladkina, Lincoln D. Carr Transport phenomena in multi-scale classical systems, such as disordered media, porous materials, and turbulent fluids, are characterized by multiple spatial and temporal scales, nonlocality, fractional geometry, and non-Gaussian statistics. Transport in multi-scale classical materials is described by the fractional diffusion equation, while its quantum analog, fractional Schr\"{o}dinger equation, governs the dynamics of quantum materials. The fundamental processes of multi-scale quantum materials are carried out on a local fractional space-time metric. We show that the minimization of action on fractional space-time metric with a subsequent evaluation of the Feynman path integral leads to a self-consistent derivation of the fractional Schr\"{o}dinger equation, which is valid for any order of fractional space-time. We apply the derived fractional Schr\"{o}dinger equation to multi-scale quantum materials and show that they can be effectively modeled by a system of cold atoms in a multi-frequency optical potential. Specifically we demonstrate that the tunneling matrix element in fractional quantum materials embedded in a single frequency optical potential exactly matches the corresponding matrix element in multi-frequency optical potential. [Preview Abstract] |
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