Article
Physics, Multidisciplinary
T. K. Langin, D. DeMille
Summary: Recent experiments have shown that it is possible to directly cool and trap diatomic and triatomic molecules in magneto-optical traps (MOTs). However, the density achieved in molecular MOTs is still 10(-5) times smaller than in atomic MOTs. The main limitations are the inefficiencies in slowing down molecules to capture velocities and the density limits within the MOT due to sub-Doppler heating. Driving 'Type-II' optical cycling transitions that involve dark states in Zeeman sublevels is necessary to avoid rotational branching. Simulations have been presented to address these limitations and pave the way for evaporative cooling of molecules to quantum degeneracy.
NEW JOURNAL OF PHYSICS
(2023)
Article
Multidisciplinary Sciences
Nathaniel B. Vilas, Christian Hallas, Loic Anderegg, Paige Robichaud, Andrew Winnicki, Debayan Mitra, John M. Doyle
Summary: In this study, the successful magneto-optical trapping of a polyatomic molecule, calcium monohydroxide (CaOH), demonstrates the feasibility and practicality of laser cooling and trapping for polyatomic species. This achievement has significant implications for various applications in quantum science.
Article
Physics, Multidisciplinary
D. V. Bykova, A. E. Afanasiev, V. I. Balykin
Summary: This article discusses the focusing of an atomic beam using a two-dimensional magneto-optical trap to increase the number of atoms in the region of their laser cooling and localization near an atom chip. Two regimes of atom-laser field interaction are considered: (i) Doppler interaction regime at small detunings, and (ii) sub-Doppler interaction regime at large detunings. The efficiency of focusing is low in the first case due to momentum diffusion, while in the second case, the momentum diffusion is insignificant, allowing for sharp focusing of the atomic beam.
Review
Chemistry, Multidisciplinary
Rui Xu, An Li, Dongyi Li, Jiujiang Yan
Summary: The cold atomic gravimeter (CAG) achieves high measurement accuracy without needing regular calibration. The choice and design of magneto-optical traps (MOTs) directly impact atomic interference and measurement accuracy. This paper reviews MOT research history, analyzes their structure and principles, highlights the current applications, summarizes their pros and cons, and presents future perspectives for MOT development in cold atomic gravimetry.
APPLIED SCIENCES-BASEL
(2023)
Article
Optics
A. Golovizin, D. Tregubov, D. Mishin, D. Provorchenko, N. Kolachevsky
Summary: This article introduces a compact vacuum system for laser cooling and spectroscopy of neutral thulium atoms, achieving compactness through adjustments in configuration. The system demonstrates potential for use in optical atomic clocks.
Article
Physics, Atomic, Molecular & Chemical
Daniil Provorchenko, Dmitry Tregubov, Denis Mishin, Mikhail Yaushev, Denis Kryuchkov, Vadim Sorokin, Ksenia Khabarova, Artem Golovizin, Nikolay Kolachevsky
Summary: In this work, the narrow-line laser cooling of thulium atoms at 506.2nm wavelength was achieved, widening the control limits of atomic cloud parameters. Temperatures of about 400nK, phase-space density of up to 3.5x10(-4), and 2x10(6) trapped atoms were achieved. The formation of a double cloud structure in an optical lattice was also demonstrated. These results have the potential to improve experiments with BEC, atomic interferometers, and optical clocks.
Article
Optics
M. Gaudesius, Y-C Zhang, T. Pohl, R. Kaiser, G. Labeyrie
Summary: This study analyzed the spatiotemporal instabilities of large clouds of cold atoms in a magneto-optical trap through three-dimensional simulations. The research revealed different dynamical regimes in the phase space of the instabilities, providing a detailed analysis of the experimental observations.
Article
Quantum Science & Technology
Tomasz P. Sakrejda, Liudmila A. Zhukas, Boris B. Blinov
Summary: By studying sympathetic cooling of the radial ion motion in a linear RF trap with mixed barium-ytterbium chains, we demonstrate efficient sympathetic cooling of all radial normal modes for the trap aspect ratio of approximately 2.9.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Optics
Martin Schlederer, Alexandra Mozdzen, Thomas Lompe, Henning Moritz
Summary: A modified scheme is proposed to address the issue of stringent minimization of stray light from the MOT beams, achieving reliable discrimination of up to 17 K-40 atoms with classification fidelities of similar to 98% for up to 5 atom numbers and fidelities of more than 85% for up to 17 atoms.
Review
Green & Sustainable Science & Technology
Ji Zhang, Jianjuan Yuan, Junwei Liu, Zhihua Zhou, Jiyuan Sui, Jincheng Xing, Jian Zuo
Summary: Radiative cooling is a technology that emits infrared thermal radiation to achieve cooling without energy consumption. By using an IR-transparent cover shield, the cooling performance can be improved, and selective cover shields can reflect solar radiation while transmitting infrared thermal radiation to enhance cooling power.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Materials Science, Multidisciplinary
Rehana Gul, Hazrat Ali, M. Imtiaz Khan, Rafi Ud Din, Muhammad Shafiq, Bin Amin, Mahidur R. Sarker, Sawal Hamid Md Ali
Summary: This study examines the magneto-optical and image state rotation of left and right circularly plane-polarized light pulse through a double Lambda-type four-level configuration of Rubidium atom using Kerr field and Doppler broadening. The experiment shows that enhanced and lossless rotation can be achieved by applying a control field, and almost complete polarization rotation can be observed under specific conditions.
RESULTS IN PHYSICS
(2022)
Article
Optics
Junyi Duan, Xiaochi Liu, Yadong Zhou, Xin-Biao Xu, Liang Chen, Chang-Ling Zou, Zhendong Zhu, Zhilong Yu, Ning Ru, Jifeng Qu
Summary: Magneto-optical traps based on grating chips simplify cold atom physical package architectures significantly. A high-diffraction-efficiency grating magneto-optical trap (GMOT) design and fabrication are reported. The fabricated grating chip achieved a diffraction efficiency of up to 40% and successfully trapped a large number of atoms. The proposed atom chip can be used for compact cold atom clocks and other cold atom-based quantum sensors.
OPTICS COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Jongmin Lee, Grant Biedermann, John Mudrick, Erica A. Douglas, Yuan-Yu Jau
Summary: This study demonstrates the generation of a cold-atom ensemble in a sub-millimeter diameter hole in a transparent membrane, achieving temperatures as low as 10 μK through sub-Doppler cooling. The membrane MOT device allows for efficient loading of cold atoms into an optical trap for strong atom-light interaction, representing a key step towards the development of a photonic atom trap integrated platform (ATIP).
SCIENTIFIC REPORTS
(2021)
Review
Physics, Multidisciplinary
Eunmi Chae
Summary: This article summarizes the recent progress on laser cooling of molecules. Since the 1980s, laser cooling has been used to cool and trap atoms for frontier research on quantum simulations, quantum sensing, and precision measurements. Despite the complex internal structures of molecules, laser cooling of molecules has been achieved with the deepened understanding of molecular structures and the interaction between light and molecules. The development of laser technology and the use of multiple lasers have greatly aided the process of laser cooling of molecules. The article provides a detailed overview of the principle, development, and current status of laser cooling of molecules, offering an introduction to the growing field of ultracold molecular physics.
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
(2023)
Article
Multidisciplinary Sciences
M. Bohman, V. Grunhofer, C. Smorra, M. Wiesinger, C. Will, M. J. Borchert, J. A. Devlin, S. Erlewein, M. Fleck, S. Gavranovic, J. Harrington, B. Latacz, A. Mooser, D. Popper, E. Wursten, K. Blaum, Y. Matsuda, C. Ospelkaus, W. Quint, J. Walz, S. Ulmer
Summary: The article introduces a new method to cool a single proton efficiently by resonantly coupling laser-cooled Be+ ions through a superconducting LC circuit. The application of this technique also helps to improve the precision of matter-antimatter comparisons and drive the exploration of dark matter.
Article
Acoustics
H. Pihan-Le Bars, C. Guerlin, R. -D. Lasseri, J. -P. Ebran, Q. G. Bailey, S. Bize, E. Khan, P. Wolf
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2018)
Article
Optics
J. J. McFerran
Article
Engineering, Electrical & Electronic
K. Yu Pavlenko, Yu K. Pavlenko, A. A. Belyaev, I. Yu Blinov, M. N. Khromov, S. Bize, L. Lorini
QUANTUM ELECTRONICS
(2018)
Article
Optics
F. C. Reynolds, J. J. McFerran
Article
Instruments & Instrumentation
F. Riedel, A. Al-Masoudi, E. Benkler, S. Doerscher, V Gerginov, C. Grebing, S. Haefner, N. Huntemann, B. Lipphardt, C. Lisdat, E. Peik, D. Piester, C. Sanner, C. Tamm, S. Weyers, H. Denker, L. Timmen, C. Voigt, D. Calonico, G. Cerretto, G. A. Costanzo, F. Levi, I Sesia, J. Achkar, J. Guena, M. Abgrall, D. Rovera, B. Chupin, C. Shi, S. Bilicki, E. Bookjans, J. Lodewyck, R. Le Targat, P. Delva, S. Bize, F. N. Baynes, C. F. A. Baynham, W. Bowden, P. Gill, R. M. Godun, I. R. Hill, R. Hobson, J. M. Jones, S. A. King, P. B. R. Nisbet-Jones, A. Rolland, S. L. Shemar, P. B. Whibberley, H. S. Margolis
Article
Instruments & Instrumentation
C. Guo, M. Favier, N. Galland, V. Cambier, H. Alvarez-Martinez, M. Lours, L. De Sarlo, M. Andia, R. Le Targat, S. Bize
REVIEW OF SCIENTIFIC INSTRUMENTS
(2020)
Article
Physics, Applied
Jesse S. Schelfhout, Lilani D. Toms-Hardman, John J. McFerran
Summary: We demonstrate an improved method for detecting weak optical transitions in cold atoms by modulating the ground state atom population periodically, resulting in enhanced sensitivity. This method can be applied to detect and measure clock transitions in atoms with greater efficiency compared to conventional scanning methods.
APPLIED PHYSICS LETTERS
(2021)
Article
Optics
Raymon S. Watson, John J. McFerran
Summary: Efficiency of loading atoms into a one-dimensional optical lattice from a cold ensemble is modeled considering various parameters, with simulations comparing well against experimental results and guiding the computation of an optimal lattice-waist-to-cloud-radius ratio based on a given optical power.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Optics
Daniel M. Jones, Frank Van Kann, John J. Mcferran
Summary: We performed frequency measurements on the (6s2)1S0 - (6s6p)3P1 transition in 171Yb using sub-Doppler spectroscopy and a 556 nm laser locked to a discriminator. The optical frequency measurements were referenced to a high-quality quartz oscillator, synchronized to the GNSS time scale with a frequency comb. The accuracy of the reference was validated to approximately 3 x 10-12 by spectroscopy on the 1S0 - 3P0 (clock) line in laser cooled and trapped 171Yb atoms. The hyperfine constant A(3P1) was determined to be 3957833(28) kHz based on the hyperfine separation between the F = 1/2 and F = 3/2 levels of 3P1.
Article
Optics
Jesse S. Schelfhout, John J. McFerran
Summary: In this study, multiconfiguration Dirac-Hartree-Fock calculations were performed for neutral cadmium and mercury using the GRASP2018 package. The mass- and field-shift parameters for the S-1(0) - P-3(0)o and S-1(0) - P-3(1)o lines were evaluated. Revised estimates of the nuclear charge parameters and differences in mean-square charge radii were made, and the second-order hyperfine interaction for the P-3(0,1)o levels was examined.
Article
Optics
Jesse S. Schelfhout, John J. McFerran
Summary: Relativistic multiconfiguration Dirac-Hartree-Fock calculations were conducted for different states of neutral ytterbium, evaluating mass- and field-shift parameters and hyperfine interaction. Isotope shifts were estimated by multiple means to predict clock-line frequencies, with implications for nonlinear tests and signatures beyond the standard model.
Article
Optics
Peggy E. Atkinson, Jesse S. Schelfhout, John J. McFerran
Proceedings Paper
Engineering, Electrical & Electronic
G. D. Rovera, S. Bize, B. Chupin, J. Guena, Ph. Laurent, L. Lorini, P. Uhrich, M. Abgrall
2018 CONFERENCE ON PRECISION ELECTROMAGNETIC MEASUREMENTS (CPEM 2018)
(2018)
Article
Optics
Alexander Guttridge, Stephen A. Hopkins, Matthew D. Frye, John J. McFerran, Jeremy M. Hutson, Simon L. Cornish
Proceedings Paper
Automation & Control Systems
John McFerran, Emeric de Clercq
2017 JOINT CONFERENCE OF THE EUROPEAN FREQUENCY AND TIME FORUM AND IEEE INTERNATIONAL FREQUENCY CONTROL SYMPOSIUM (EFTF/IFC)
(2017)
