Professional Education

  • Bachelor of Science, University Of Tokyo (2010)
  • Doctor of Philosophy, Massachusetts Institute of Technology (2017)

All Publications

  • Measurement of the Newtonian constant of gravitation G by precision displacement sensors CLASSICAL AND QUANTUM GRAVITY Kawasaki, A. 2020; 37 (7)
  • Robust kHz-linewidth distributed Bragg reflector laser with optoelectronic feedback OPTICS EXPRESS Yamoah, M., Braverman, B., Pedrozo-Penafiel, E., Kawasaki, A., Zlatkovic, B., Vuletic, V. 2019; 27 (26): 37714–20


    We demonstrate a combination of optical and electronic feedback that significantly narrows the linewidth of distributed Bragg reflector lasers (DBRs). We use optical feedback from a long external fiber path to reduce the high-frequency noise of the laser. An electro-optic modulator placed inside the optical feedback path allows us to apply electronic feedback to the laser frequency with very large bandwidth, enabling robust and stable locking to a reference cavity that suppresses low-frequency components of laser noise. The combination of optical and electronic feedback allows us to significantly lower the frequency noise power spectral density of the laser across all frequencies and narrow its linewidth from a free-running value of 1.1 MHz to a stabilized value of 1.9 kHz, limited by the detection system resolution. This approach enables the construction of robust lasers with sub-kHz linewidth based on DBRs across a broad range of wavelengths.

    View details for DOI 10.1364/OE.27.037714

    View details for Web of Science ID 000507254300053

    View details for PubMedID 31878548

  • Precision Mass and Density Measurement of Individual Optically Levitated Microspheres PHYSICAL REVIEW APPLIED Blakemore, C. P., Rider, A. D., Roy, S., Fieguth, A., Kawasaki, A., Priel, N., Gratta, G. 2019; 12 (2)
  • Near-Unitary Spin Squeezing in Yb-171 PHYSICAL REVIEW LETTERS Braverman, B., Kawasaki, A., Pedrozo-Penafiel, E., Colombo, S., Shu, C., Li, Z., Mendez, E., Yamoah, M., Salvi, L., Akamatsu, D., Xiao, Y., Vuletic, V. 2019; 122 (22)
  • Electrically driven, optically levitated microscopic rotors PHYSICAL REVIEW A Rider, A. D., Blakemore, C. P., Kawasaki, A., Priel, N., Roy, S., Gratta, G. 2019; 99 (4)
  • Three-dimensional force-field microscopy with optically levitated microspheres PHYSICAL REVIEW A Blakemore, C. P., Rider, A. D., Roy, S., Wang, Q., Kawasaki, A., Gratta, G. 2019; 99 (2)
  • Geometrically asymmetric optical cavity for strong atom-photon coupling PHYSICAL REVIEW A Kawasaki, A., Braverman, B., Pedrozo-Penafiel, E., Shu, C., Colombo, S., Li, Z., Ozel, O., Chen, W., Salvi, L., Heinz, A., Levonian, D., Akamatsu, D., Xiao, Y., Vuletic, V. 2019; 99 (1)
  • Search for kilogram-scale dark matter with precision displacement sensors PHYSICAL REVIEW D Kawasaki, A. 2019; 99 (2)
  • Impact of non-unitary spin squeezing on atomic clock performance NEW JOURNAL OF PHYSICS Braverman, B., Kawasaki, A., Vuletic, V. 2018; 20