Bulletin of the American Physical Society
48th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 62, Number 8
Monday–Friday, June 5–9, 2017; Sacramento, California
Session N4: Non-linear Optics |
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Chair: Bonnie Schmittberger, JQI/University of Maryland Room: 309 |
Thursday, June 8, 2017 10:30AM - 10:42AM |
N4.00001: Subfemtosecond pulse synthesis via coherent broadband generation in Raman-active crystal Mariia Shutova, Alexandra Zhdanova, Alexei Sokolov Subfemtosecond single- or sub-cycle broadband pulses of light are under active study because of their many applications; for example, detecting electron drift and atomic ionization; moreover, single cycle pulses offer the possibility of optical arbitrary waveform generation. Our group works on synthesizing such ultrashort pulses in ultraviolet-visible-near infrared range by making use of broadband generation in a Raman-active crystal. We have previously proven that the multi-color Raman sidebands generated in this way are mutually coherent and thus can be recombined to obtain ultrashort pulses of broadband radiation by proper phase alignment. We present a setup scheme which uses dichroic mirrors to combine near infrared pump and Stokes beams along with several sidebands in visible range in one beam in collinear scheme and control the phase of each sideband with nanometer precision. Finally, we examine the relative phase between each sideband by analyzing the beating of SHG and SFG signals generated in BBO crystal, moreover, the subfemtosecond duration of resultant pulse can be proved by looking at multiphoton ionization of xenon gas, since it has been shown that the ion yield is related to the duration of the pulse. [Preview Abstract] |
Thursday, June 8, 2017 10:42AM - 10:54AM |
N4.00002: Gaussian Beam Propagation for Nonlinear Optics featuring Orbital Angular Momentum Transfer R. Nicholas Lanning, Zhihao Xiao, Mi Zhang, Irina Novikova, Eugeniy E. Mikhailov, Jonathan P. Dowling We present a general, Gaussian spatial mode propagation formalism for describing the generation of higher order multi-spatial mode beams generated during nonlinear interactions. Furthermore, to implement the theory, we simulate optical angular momentum transfer interactions, and show how one can optimize the interaction to reduce the undesired pollution of the spatial mode structure. [Preview Abstract] |
Thursday, June 8, 2017 10:54AM - 11:06AM |
N4.00003: Improvement of Two-Mode Squeezing in the Presence of Loss with a Phase-Sensitive Amplifer Tian Li, Brian Anderson, Bonnie Schmittberger, Travis Horrom, Kevin Jones, Paul Lett We demonstrate a phase-sensitive amplifier (PSA) to pre-amplify quantum correlations in twin light beams before degradation due to loss and detector efficiency. We use four-wave mixing (4WM) in Rb vapor to generate bright beams in a two-mode squeezed state. After which, a second 4WM interaction in a PSA configuration amplifies one half of the two-mode state before a loss is intentionally introduced. It is well known that, in the case of a PSA, no extra noise will be added given the correct relative phases (e.g. at the maximal amplification and the maximal deamplification) among the inputs. We thus lock our PSA phase at the phase where we are able to have the maximal, noiseless, amplification of one half of the two-mode squeezed state and compare with its twin beam. Due to this noiseless pre-amplification, we demonstrate that phase-sensitive amplification placed before losses can improve correlations between the beams, or squeezing. [Preview Abstract] |
Thursday, June 8, 2017 11:06AM - 11:18AM |
N4.00004: Quantum droplets of light in the presence of synthetic magnetic fields. Kali Wilson, Niclas Westerberg, Manuel Valiente, Callum Duncan, Ewan Wright, Patrik Ohberg, Daniele Faccio Recently, quantum droplets have been demonstrated in dipolar Bose-Einstein condensates, where the long range (nonlocal) attractive interaction is counterbalanced by a local repulsive interaction. In this work, we investigate the formation of quantum droplets in a two-dimensional nonlocal fluid of light. Fluids of light allow us to control the geometry of the system, and thus introduce vorticity which in turn creates an artificial magnetic field for the quantum droplet. In a quantum fluid of light, the photons comprising the fluid are treated as a gas of interacting Bose-particles, where the nonlocal interaction comes from the nonlinearity inherent in the material, in our case an attractive third-order thermo-optical nonlinearity. In contrast to matter-wave droplets, photon fluid droplets are not stabilised by local particle-particle scattering, but from the quantum pressure itself, i.e., a balance between diffraction and the nonlocal nonlinearity. We will present a numerical and analytical investigation of the ground state of these droplets and of their subsequent dynamics under the influence of a self-induced artificial magnetic field, and discuss experimental work with the possibility to include artificial gauge interactions between droplets. [Preview Abstract] |
Thursday, June 8, 2017 11:18AM - 11:30AM |
N4.00005: Abstract Withdrawn
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Thursday, June 8, 2017 11:30AM - 11:42AM |
N4.00006: Photon number-selective dipolar-exchange induced transparency with Rydberg atoms David Petrosyan A three-level atomic medium can be made transparent to a resonant probe field in the presence of a control field acting on an adjacent atomic transition to a long-lived state, which can be represented by a highly excited Rydberg state. The long-range interactions between the Rydberg state atoms then translate into strong, non-local, dispersive or absorptive interactions between the probe photons. These interactions can be used to achieve deterministic quantum logic gates and single photon sources. We show that long-range dipole-dipole exchange interaction with one or more spins -- two-level systems represented by atoms in suitable Rydberg states -- can play the role of control field for the optically-dense medium of atoms. This induces transparency of the medium for a number of probe photons $n_p$ not exceeding the number of spins $n_s$, while all the excess photons are resonantly absorbed upon propagation. The system can thus serve as a photon-number filter or a transistor, with the number of appropriately prepared spins $n_s =0,1,\ldots$ being the switch. [Preview Abstract] |
Thursday, June 8, 2017 11:42AM - 11:54AM |
N4.00007: Towards efficient photon-photon interaction at room temperature Reihaneh Shahrokhshahi, Mehdi Namazi, Steven Sagona-Stophel, Bertus Jordaan, Eden Figueroa Strong atom mediated photon-photon interactions are the backbone of future deterministic quantum gates. Here we present our current results regarding the interaction of few photon level fields mediated by $^{87}Rb$ atoms in a room temperature atomic vapor. We have implemented a double-lambda atomic scheme [1]. The first EIT system uses a weak probe coupling to the $D_1$, $\ket{5S_{1/2}, F = 1 }\leftrightarrow\ket{5P_{1/2}, F = 1 }$ transition and strong control field coupling to the $\ket{5S_{1/2}, F = 2 }\leftrightarrow\ket{5P_{1/2}, F = 1 }$ transition, while the second EIT system addresses the same atomic levels albeit with an extra 80 MHz one photon detuning. The presence of few photon level signal field is used to steer the phase of the probe photon wave packet . We have achieved meaningful crossed phase modulation for 400ns long probe and signal pulses containing only a few photons. The magnitude of the probe field phase shift per photon in the signal field is quantified using a homodyne detector and is several orders of magnitude larger as compared to what we have observed in our previous characterization of a Kerr nonlinearity [2]. [1] Z.-Y. Liu, et al. Phys. Rev. Lett., 117, 203601 (2016). [2] C. Kupchak, et al, Sci. Rep, 5, 16581 (2015). [Preview Abstract] |
Thursday, June 8, 2017 11:54AM - 12:06PM |
N4.00008: Quantum Nonlinear Interferometry for Occultation Satellite Remote Sensing Felix Jaetae Seo, Jia Su, Quinton Rice, Dulitha Jayakodige, William Moore, Pat McCormick, Bagher Tabibi Quantum nonlinear interferometry is of great interest for quantum information and sensing applications. The quantum measurement of atmospheric gases is proposed with the principle of the nonlocal correlation of signal and idler beams by spontaneous parametric down conversion (SPDC). If the phase and amplitude of idler in the mid-infrared from a nonlinear crystal in the transmitter satellite at geosynchronous equatorial orbit (GEO) are nonlocally correlated to those of its own signal, and if the phase difference between two idlers of nonlinear crystals in the transmitter (GEO) and receiver (LEO or GEO) satellites forms a constructive interference, the measurement of signal interference between visible photons from two nonlinear crystals provides the information of interaction between idler photon and atmospheric gases. The transmittance reduction of idler due to atmospheric gas absorption results in the interference amplitude reduction, which is nonlocally correlated to the interference amplitude of signal beams. If the nonlocal interference visibility of signal beams indicates the normalized difference of outer and inner envelopes, the absorption coefficients and the concentration of atmospheric gases can be analyzed through the quantum nonlinear interferometry. Therefore, the nonlocal and nonlinear quantum interferometry is proposed to develop satellite remote sensing with shallow and deep occultation techniques, and promote the laser interferometer space antenna for gravitational wave measurement. [Preview Abstract] |
Thursday, June 8, 2017 12:06PM - 12:18PM |
N4.00009: Atmospheric remote sensing via optically pumped CO$_{\mathrm{2}}$ laser Anton Shutov, Mariia Shutova, Alexander Goltsov, Alexei Sokolov, Marlan Scully With the growing global warming problem atmospheric remote sensing, especially remote detection of CO$_{\mathrm{2}}$ levels, has become a hot topic nowadays. Here we discuss an idea on how CO$_{\mathrm{2}}$ gas in air can be turned into a laser medium. This type of CO$_{\mathrm{2}}$ laser is pumped via Raman vibrational mode excitation of the nitrogen present in air. We propose an experiment to implement this type of a laser, where vibrational excitation of nitrogen is produced by a pair of Raman-resonant laser pulses. We quantify the efficiency of the Raman excitation process by observing cascaded Raman sideband generation. When excitation of the first vibrational state takes place in some portion of nitrogen molecules, it is accompanied by generation of multiple Stokes and anti-Stokes sideband. Following the excitation of the vibrations in nitrogen, carbon dioxide molecules become excited due to collisions and lasing takes place as in a conventional carbon dioxide laser. [Preview Abstract] |
Thursday, June 8, 2017 12:18PM - 12:30PM |
N4.00010: Double Stokes-Mueller polarimetry in KTP (Potassium Titanyl Phosphate) crystal Chitra Shaji, Sruthil Lal S B, Alok Sharan Ultra-structural properties of material are being probed by Double Stokes-Mueller polarimetry (DSMP) technique. It makes use of higher dimensions of Stokes vector (9 X 1) and Mueller matrix (4 X9) to characterize the nonlinear optical properties of a material. Second harmonic generation (SHG) at 532nm using 1064nm as fundamental cw beam from Nd: YAG laser in type II phase matched KTP (Potassium Titanyl Phosphate) crystal is studied using DSMP. The experimental measurements for determining double Mueller matrix are carried out in the “Polarization In Polarization Out” (PIPO) arrangement. Nine input polarization states are incident on the sample and the linear Stokes vector of the emerging light from the sample is measured. The KTP crystal is oriented such that the SHG signal efficiency at the incident horizontal and vertical polarizations is high as compared to diagonal polarization states. The susceptibility tensor components and the phase difference between them at this orientation are determined from the double Mueller matrix elements. These determined values give information regarding the crystal axis orientations. To our knowledge, this is the first report of the use of DSMP technique to determine the crystal orientations of a biaxial crystal. [Preview Abstract] |
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