Atomic, Molecular, Optical Science

AMOS encompasses the research in
atomic, molecular, and optical science
at the Weizmann Institute of Science.

AMOS Research Areas

AMOS is a center for quantum physics with atomic, molecular, and optical systems, at the Weizmann Institute of Science. The center includes 15 research groups and activities ranging across most contemporary topics in AMO physics - from atto-second pulses and intense lasers, through precision spectroscopy of ultracold atoms, molecules or ions, to quantum information and quantum optics. AMOS members hold faculty appointments in both the Physics and Chemistry Faculties at the Weizmann Institute of Science.

A wide range of interests and scientific excellence contribute to making AMOS one of Israel's leading research centers. AMOS scientists publish annually numerous scientific manuscripts in leading journals.

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Seminars

  • Date:
    09
    Jul 2024
    13:15

    Computer vision beyond conventional imaging

    Speakers
    Mark Sheinin - Weizmann Institute of Science

    Abstract:

    Computer vision aims to endow machines with the ability to understand the environment through images and videos. It has made great progress in the past decade due to the combination of large datasets, novel architectures, and powerful computing. While the architectures and computing have changed dramatically over time, most vision algorithms still train on images captured with 'conventional' imaging, limiting the type of information that can be extracted about the environment. This talk will overview several works that expand computer vision by combining novel imaging hardware with task-specific physics-based inverse problems to reveal hidden phenomena.

    First, I will describe the ACam - a camera designed to capture the minute flicker of artificial lights ubiquitous in our modern environments. I will show that bulb flicker is a powerful visual cue that enables various applications like scene light source unmixing, reflection separation, and remote analyses of the electric grid itself. Then, I will describe Diffraction Line Imaging, a novel imaging principle that exploits diffractive optics to capture sparse 2D scenes with 1D (line) sensors. The method's applications include fast motion capture, PIV, and structured light 3D scanning. I will also present a new approach for sensing minute high-frequency surface vibrations (up to 63kHz) for multiple scene sources simultaneously, using "slow" sensors rated for only 130Hz. Applications include capturing vibration caused by audio sources (e.g., speakers, human voice, and musical instruments) and localizing vibration sources (e.g., the position of a knock on the door). Lastly, I will present a novel active vision system that combines thermal imaging with laser illumination to enable dynamic vision tasks like object tracking, structure from motion, and optical flow on completely textureless objects.

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Publications

  • Simple few-shot method for spectrally resolving the wavefront of an ultrashort laser pulse

    Smartsev S., Liberman A., Andriyash I. A., Cavagna A., Flacco A., Giaccaglia C., Kaur J., Monzac J., Tata S., Vernier A., Malka V., Lopez-Martens R. & Faure J. (2024) Optics Letters.
    We present a novel, to the best of our knowledge, and straightforward approach for the spatio-spectral characterization of ultrashort pulses. This minimally intrusive method relies on placing a mask with specially arranged pinholes in the beam path before the focusing optic and retrieving the spectrally resolved laser wavefront from the speckle pattern produced at focus. We test the efficacy of this new method by accurately retrieving chromatic aberrations, such as pulse-front tilt (PFT), pulse-front curvature (PFC), and higher-order aberrations introduced by a spherical lens. The simplicity and scalability of this method, combined with its compatibility with single-shot operation, make it a strong complement to existing tools for high-intensity laser facilities.
  • The Future of Attosecond Science

    Dudovich N., Fang L., Gaarde M., Keller U., Landsman A., Richter M., Rohringer N. & Young L. (2024) .
    Conferences are incredible opportunities to strengthen the inclusive outlook of our scientific community. The participation of female scientists, postdocs, and graduate students in the ATTO VIII conference was remarkable, with more than 40% of female invited speakers. The Local Organizing Committee seized this opportunity to promote an atmosphere that welcomes all. An entirely female evening panel, with experience across the attosecond science spectrum, was convened to explore the Future of Attosecond Science in the evening session of Wednesday, July 13. Furthermore, a booklet entitled Perspectives in Attosecond Science was compiled by Dr. Shima Gholam-Mirzaei of the University of Ottawa and ATTO co-chairs Luca Argenti and Michael Chini, in collaboration with members of the Local Organizing Committee and others, which included interviews with female scientists at all career levels and which was included in the conference materials. The text has been minimally edited to improve clarity and readability.