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

K. Yamada, Y. Tajima, T. Murayoshi, X. Fan, A. Ishida, T. Namba, S. Asai, M. Kuwata-Gonokami, E. Chae, K. Shu, and K. Yoshioka

Phys. Rev. Applied 16, 014009 – Published 6 July 2021

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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Received 24 January 2021
Revised 6 May 2021
Accepted 14 June 2021

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

Physics Subject Headings (PhySH)

Bose-Einstein condensates Cooling & trapping Laser dynamics Laser spectroscopy Nonlinear optics

Positronium

Gamma-ray techniques

Atomic, Molecular & Optical

Authors & Affiliations

K. Yamada ¹, Y. Tajima ², T. Murayoshi¹, X. Fan ^1,†, A. Ishida ¹, T. Namba³, S. Asai ¹, M. Kuwata-Gonokami ¹, E. Chae ^2,4,5, K. Shu ^1,2,4, and K. Yoshioka ^2,4,*

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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Vol. 16, Iss. 1 — July 2021

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