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    Theoretical Analysis and Experimental Demonstration of a Chirped Pulse-Train Generator and its Potential for Efficient Cooling of Positronium

    K. Yamada1, Y. Tajima2, T. Murayoshi1, X. Fan1,†, A. Ishida1, T. Namba3, S. Asai1, M. Kuwata-Gonokami1, E. Chae2,4,5 et al.

    K. Shu1,2,4 and K. Yoshioka2,4,*

    • 1Department of Physics, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
    • 2Department of Applied Physics, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
    • 3International Center for Elementary Particle Physics (ICEPP), The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
    • 4Photon Science Center, Graduate School of Engineering, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
    • 5Department of Physics, Korea University, Anam-ro 145, Seongbuk-gu, Seoul 02841, Republic of Korea
    • *yoshioka@fs.t.u-tokyo.ac.jp
    • †Present address: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
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    Phys. Rev. Applied 16, 014009 – Published 6 July, 2021

    DOI: https://doi.org/10.1103/PhysRevApplied.16.014009

    Abstract

    We propose an injection-locked pulsed laser with an electro-optic phase modulator in a Ti:sapphire laser cavity to realize both broadband optical spectra and long pulse durations. Further, we experimentally and theoretically demonstrate that the output microsecond-long pulse consists of a train of short pulses in the time domain and a comblike broadband spectrum with fast chirping in the positive and negative directions in the frequency domain. Finally, we discuss the potential of the proposed system for efficient Doppler cooling of positronium, a short-lived exotic atom.

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    Phys. Rev. Applied 16, 014009– Published 6 July, 2021
    • Received 24 January 2021
    • Revised 6 May 2021
    • Accepted 14 June 2021
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