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C. Raman - One of the best experts on this subject based on the ideXlab platform.
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high quality factor microring resonator for strong atom light interactions using miniature Atomic Beams
Optics Letters, 2020Co-Authors: Ali Eshaghian Dorche, C. Raman, Bochao Wei, Ali AdibiAbstract:An integrated photonic platform is proposed for strong interactions between Atomic Beams and annealing-free high-quality-factor (Q) microresonators. We fabricated a thin-film, air-clad SiN microresonator with a loaded Q of 1.55×106 around the optical transition of 87Rb at 780 nm. This Q is achieved without annealing the devices at high temperatures, enabling future fully integrated platforms containing optoelectronic circuitry. The estimated single-photon Rabi frequency (2g) is 2π×64MHz 100 nm above the resonator. Our simulation result indicates that miniature Atomic Beams with a longitudinal speed of 0.2 m/s to 30 m/s will interact strongly with our resonator, allowing for the detection of single-atom transits and realization of scalable single-atom photonic devices. Interactions between racetrack resonators and thermal Atomic Beams are also simulated.
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near source fluorescence spectroscopy for miniaturized thermal Atomic Beams
arXiv: Atomic Physics, 2019Co-Authors: Bochao Wei, Xiao Chai, Jeremy Yang, Anosh Daruwalla, Farrokh Ayazi, C. RamanAbstract:Miniature Atomic Beams can provide new functionalities for atom based sensing instruments such as Atomic clocks and interferometers. We recently demonstrated a planar silicon device for generating well-collimated thermal Atomic Beams [Nat Commun 10, 1831 (2019)]. Here, we present a near-source fluorescence spectroscopy (NSFS) technique that can fully characterize such miniature Beams even when measured only a few millimeters from the nozzle exit. We also present a recipe for predicting the fluorescence spectrum, and therefore, the source angular distribution, even under conditions of strong laser saturation of the probing transition. Monte Carlo simulations together with multi-level master equation calculations fully account for the influence of optical pumping and spatial extension of the Gaussian laser beam. A notable consequence of this work is the agreement between theory and experimental data that has allowed fine details of the angular distribution of the collimator to be resolved over 3 decades of dynamic range of Atomic beam output flux.
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Cascaded collimator for Atomic Beams traveling in planar silicon devices
Nature Communications, 2019Co-Authors: Chao Li, Xiao Chai, Jeremy Yang, Anosh Daruwalla, Farrokh Ayazi, C. RamanAbstract:Micro- and increasingly, nano-fabrication have enabled the miniaturization of Atomic devices, from vapor cells to atom chips for Bose-Einstein condensation. Here we present microfabricated planar devices for thermal Atomic Beams. Etched microchannels were used to create highly collimated, continuous rubidium atom Beams traveling parallel to a silicon wafer surface. Precise, lithographic definition of the guiding channels allowed for shaping and tailoring the velocity distributions in ways not possible using conventional machining. Multiple miniature Beams with individually prescribed geometries were created, including collimated, focusing and diverging outputs. A “cascaded” collimator was realized with 40 times greater purity than conventional collimators. These localized, miniature atom beam sources can be a valuable resource for a number of quantum technologies, including atom interferometers, clocks, Rydberg atoms, and hybrid atom-nanophotonic systems, as well as enabling controlled studies of atom-surface interactions at the nanometer scale. Bringing Atomic beam technology to the chip scale is challenging due to the long distance required to filter the velocity distribution. Here, the authors report an engineering strategy for on-chip filtering of the velocity profile of Atomic Beams by fabricating planar, etched microchannel arrays.
Alonso Castro - One of the best experts on this subject based on the ideXlab platform.
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Isotopic spectroscopy of uranium Atomic Beams produced by thermal reduction of uranium compounds
Spectrochimica Acta Part B: Atomic Spectroscopy, 2019Co-Authors: Joshua H. Bartlett, Alonso CastroAbstract:Abstract We present a method for producing Atomic Beams of uranium from molecular uranium precursors in a micro-crucible. In previous work, we have shown that uranium in an Atomic beam can be analyzed for isotopic abundances down to enrichment levels of 0.7%. Here, we show that the same method can be utilized to analyze samples of any of the most common uranium-containing compounds to obtain the same quality of analytical results. This technique relies only on the addition of a metal species capable of reducing the uranium compound of interest. This work presents a brief discussion of the necessary criteria for thermal reduction, development and proof-of-principle of the technique using Er2O3 as a non-radioactive surrogate material, and application to samples of the uranium compounds UO2, U3O8, UO2(NO3)2, UO2F2, and UF4, to obtain isotope-resolved absorption spectra from an Atomic beam produced from these molecular precursors.
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note micro channel array crucible for isotope resolved laser spectroscopy of high temperature Atomic Beams
Review of Scientific Instruments, 2017Co-Authors: Vyacheslav Lebedev, Joshua H. Bartlett, Alexander Malyzhenkov, Alonso CastroAbstract:We present a novel compact design for a multichannel Atomic oven which generates collimated Beams of refractory atoms for fieldable laser spectroscopy. Using this resistively heated crucible, we demonstrate spectroscopy of an erbium sample at 1300 °C with improved isotopic resolution with respect to a single-channel design. In addition, our oven has a high thermal efficiency. By minimizing the surface area of the crucible, we achieve 2000 °C at 140 W of applied electrical power. As a result, the design does not require any active cooling and is compact enough to allow for its incorporation into fieldable instruments.
Joshua H. Bartlett - One of the best experts on this subject based on the ideXlab platform.
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Isotopic spectroscopy of uranium Atomic Beams produced by thermal reduction of uranium compounds
Spectrochimica Acta Part B: Atomic Spectroscopy, 2019Co-Authors: Joshua H. Bartlett, Alonso CastroAbstract:Abstract We present a method for producing Atomic Beams of uranium from molecular uranium precursors in a micro-crucible. In previous work, we have shown that uranium in an Atomic beam can be analyzed for isotopic abundances down to enrichment levels of 0.7%. Here, we show that the same method can be utilized to analyze samples of any of the most common uranium-containing compounds to obtain the same quality of analytical results. This technique relies only on the addition of a metal species capable of reducing the uranium compound of interest. This work presents a brief discussion of the necessary criteria for thermal reduction, development and proof-of-principle of the technique using Er2O3 as a non-radioactive surrogate material, and application to samples of the uranium compounds UO2, U3O8, UO2(NO3)2, UO2F2, and UF4, to obtain isotope-resolved absorption spectra from an Atomic beam produced from these molecular precursors.
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note micro channel array crucible for isotope resolved laser spectroscopy of high temperature Atomic Beams
Review of Scientific Instruments, 2017Co-Authors: Vyacheslav Lebedev, Joshua H. Bartlett, Alexander Malyzhenkov, Alonso CastroAbstract:We present a novel compact design for a multichannel Atomic oven which generates collimated Beams of refractory atoms for fieldable laser spectroscopy. Using this resistively heated crucible, we demonstrate spectroscopy of an erbium sample at 1300 °C with improved isotopic resolution with respect to a single-channel design. In addition, our oven has a high thermal efficiency. By minimizing the surface area of the crucible, we achieve 2000 °C at 140 W of applied electrical power. As a result, the design does not require any active cooling and is compact enough to allow for its incorporation into fieldable instruments.
Sung Hoon Yang - One of the best experts on this subject based on the ideXlab platform.
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Generation of a slow and continuous cesium Atomic beam for an Atomic clock
Journal of The Optical Society of America B-optical Physics, 2002Co-Authors: Sang Eon Park, Eun-joo Shin, Taeg Yong Kwon, Sung Hoon YangAbstract:A thermal Atomic beam from a cesium oven was slowed down by use of the Hoffnagle modified white-light cooling technique. In addition, the Atomic beam was collimated by use of a two-dimensional optical molasses that was installed transverse to the Atomic-beam direction. The flux of the Atomic beam was 2×1010 atoms/s, an increase of a factor of 16 as a result of the collimation. The mean longitudinal velocity was ∼24.4 m/s, and the rms velocity spread of the slowed Atomic beam was ∼1 m/s. Compared with other methods, we found that the Hoffnagle method is suitable for the generation of slow Atomic Beams to be used in an Atomic clock, which requires an ultralow magnetic field environment. This Atomic beam was deflected by an angle of 30° by a one-dimensional optical molasses to separate it from laser light and high-velocity atoms.
X D Zhu - One of the best experts on this subject based on the ideXlab platform.
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fabrication of nano structural arrays by channeling pulsed Atomic Beams through pulsed laser standing waves under off resonant condition
Applied Physics Letters, 1999Co-Authors: X D ZhuAbstract:We show that it is feasible to produce one- and two-dimensional nano-structure arrays by passing microsecond pulsed Atomic Beams through microsecond laser standing-wave patterns under completely off-resonant condition. This method enables fabrication of vertically heterogeneous nanostructures such as multilayers with one pulsed laser system.