Bulletin of the American Physical Society
Fall 2015 Joint Meeting of the Texas Section of the AAPT, Texas Section of the APS and Zone 13 of the Society of Physics Students
Volume 60, Number 15
Thursday–Saturday, October 29–31, 2015; Waco, Texas
Session F1: Quantum Optics I |
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Chair: Dimitri Vorodine, Texas A&M University and Baylor University Room: C.105 |
Friday, October 30, 2015 1:30PM - 1:42PM |
F1.00001: Femtosecond optical vortices and transfer of OAM algebra in nonlinear interactions. Mariia Shutova, Alexandra Zhdanova, Aysan Bahari, Miaochan Zhi, Alexei Sokolov Optical vortices (OV) are of great interest to our group because they provide an opportunity to generate ultrashort spatially-structured optical beams, which can be used to study ultrafast, biological processes, as in STED microscopy. We will present results from our investigation of the interaction of femtosecond optical vortices with nonlinear crystals and the corresponding transfer of orbital angular momentum (OAM) through this interaction. In our experimental setup, an approximately linearly chirped pulse is split into pump and Stokes pulses and recombined at a nonlinear crystal with a relative time delay, interacting in a cascaded Raman process and producing Raman sidebands. We shape the originally Gaussian pump and Stokes beams into vortices using a spatial light modulator, allowing us to easily control the OAM of each beam and generate OV sidebands. We then examine the OAM transfer into each sideband and find that it follows a certain law that can be derived from angular momentum conservation for created and annihilated photons, or equivalently, from phase matching considerations for the interacting beams [Preview Abstract] |
Friday, October 30, 2015 1:42PM - 1:54PM |
F1.00002: Comparing techniques for the study of orbital angular momentum transfer in nonlinear processes Aysan Bahari, Alexandra Zhdanova, Mariia Shutova, Miaochan Zhi, Alexei Sokolov We present results from our investigation for the transfer of orbital angular momentum in nonlinear processes. We introduce an experimental setup to study optical vortex beams (which carry orbital angular momentum) through the use of a spatial light modulator (SLM), which has much greater flexibility than the spiral phase plates we used earlier. We compare our results and measurement methods to an older setup which did not have such freedom. Finally, we will discuss how our results may be derived from orbital angular momentum conservation, or equivalently, from phase matching between the beams. [Preview Abstract] |
Friday, October 30, 2015 1:54PM - 2:06PM |
F1.00003: Single-photon superradiance and radiation trapping by atomic shells Anatoly Svidzinsky, Fu Li, Hongyuan Li, Xiwen Zhang Collective nature of light emission by atomic ensembles yields fascinating effects such as superradiance and radiation trapping even at the single-photon level. Photon emission is influenced by virtual transitions and collective Lamb shift which yields peculiar features in temporal evolution of the atomic system. We study how two-dimensional atomic structures collectively emit light. Namely, we consider spherical, cylindrical and spheroidal shells with two-level atoms continuously distributed on the shell surface and find exact analytical solution for eigenstates of such systems, their collective decay rates and frequency shifts. We identify states which undergo superradiant decay and states which are trapped and investigate how size and shape of the shell affects collective light emission. Our findings could be useful for quantum information storage and design of optical switches. [Preview Abstract] |
Friday, October 30, 2015 2:06PM - 2:18PM |
F1.00004: Ultrashort pulse propagation through three level medium Tuguldur Begzjav, Anatoly Svidzinsky, Marlan Scully By using Bäcklund transformation for the Maxwell-Bloch equations we study propagation of short pulses through medium composed of three level atoms. We obtain general matched pulse solutions that preserve their shape and amplitude during propagation. We also analyzed solutions for a variety of initial conditions by numerical simulations. Our result could be useful for development of quantum optical transmission lines. [Preview Abstract] |
Friday, October 30, 2015 2:18PM - 2:30PM |
F1.00005: Generation of enhanced even and odd harmonics in a two-color laser field M. Sayrac, A. A. Kolomenskii, Y. Boran, J. Strohaber, H. A. Schuessler We present results on an enhanced production of high harmonics (HHs) with a two-color laser field $(\omega_{0} +2\omega_{0} )$ in argon (Ar), nitrogen (N$_{\mathrm{2}})$ and carbon dioxide (CO$_{\mathrm{2}})$ gases having close ionization potentials, $I_{p} =15.6eV$ , $I_{p} =15.7eV$, and $I_{p} =13.77eV$ respectively. The fundamental radiation at $\omega_{0} $corresponds to 50fs pulses from a Ti:sapphire chirped-pulse amplifier laser system at 800nm. Odd $\left( {2n+1} \right)\omega_{0} \quad \left( {n=2-10} \right)$ and even $2\left( {2m+1} \right)\omega_{0} \quad \left( {m=1-3} \right)$ harmonics, were observed in the $\omega_{0} +2\omega_{0} $ driving field. High harmonics were measured for parallel and perpendicular relative polarizations orientations of the $\omega_{0} $and $2\omega_{0} $-fields, and intensity of $\omega_{0} $ beam was$\sim 1.5\times 10^{14}W/cm^{2}$, and $2\omega_{0} $ beam was in the range$\sim 3\times 10^{12}-3\times 10^{13}W/cm^{2}$. An increased conversion efficiency into HHs, notably of the $2\left( {2n+1} \right)$ orders was found for the latter case. With the combined $(\omega_{0} +2\omega_{0} )$field, which was obtained by inserting a doubling crystal into the fundamental $\left( {\omega_{0} } \right)$beam, more than an order of magnitude enhancement of the HHs signal was observed compared to the$\omega_{0} $-field or its second harmonic $\left( {2\omega_{0} } \right)$ alone. We also discuss similarities and differences of the HH generation in the three gas media with a single and two-color beams. [Preview Abstract] |
Friday, October 30, 2015 2:30PM - 2:42PM |
F1.00006: The representation for Dicke system and spontaneous emission of single photon subradiant states. Luojia Wang, Barnabas Kim, Marlan Scully Superradiance and subradiance from an ensemble of resonant two-level atoms are interesting phenomena. The Dicke system in which the sample size is small compared to the radiation wavelength could be considered as a system of N spin-half particles and grouped into angular momentum multiplets. By means of addition of angular momentum, different kinds of subradiant states from different representations could be obtained. The collective spontaneous emission of single photon subradiant states is studied and different choices of subradiant states are compared. [Preview Abstract] |
Friday, October 30, 2015 2:42PM - 2:54PM |
F1.00007: \textbf{Pulse-Length Effects in Laser-Induced Breakdown Spectroscopy of Plant Materials} Jeremy Kunz, Brian Ko, Dmitri Voronine, Alexei Sokolov, Marlan Scully Duration of laser pulses play a critical role in laser-induced breakdown spectroscopy (LIBS). Not only does pulse-length influence the emission of the produced plasma, but also effects the interaction of light with the material surfaces. As a consequence, various pulse-length durations may be chosen depending upon the needs and application of the LIBS analysis. We examine nano-, pico-, and femtosecond pulse-length LIBS of plants. [Preview Abstract] |
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