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Hong-Akamatsu-Asakawa Lab
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The lab studies optical frequency combs and optical clocks, using lasers to measure the frequency of light with extreme precision.
AboutAbout the lab
Opening up ultra-precise measurement with optical frequency combs and optical clocks.
The Hong-Akamatsu-Asakawa Lab specializes in quantum electronics and focuses its research on ultra-precise laser spectroscopy.
The lab conducts research and education on optical frequency combs, laser cooling, optical (atomic) clocks, atoms and molecules, quantum standards, and microparticle trapping.
The lab's website explains that optical frequency combs are used in the search for exoplanets, and that optical clocks are used in the search for dark matter and in tests of whether physical constants remain unchanged.
Key terms
- Optical frequency comb
- Light whose frequencies are lined up at equal intervals like the teeth of a comb. It is used as a ruler for measuring laser frequencies.
- Doppler-free spectroscopy
- A spectroscopic method that removes the frequency shifts caused by the motion of atoms or molecules, allowing spectra to be examined in fine detail.
- Magneto-optical trap
- A method that combines laser light and a magnetic field to confine cooled atoms in one place.
NewsLab news
A doctoral student received the Outstanding Poster Presentation Award at the Annual Meeting of the Laser Society of Japan
A paper on precision spectroscopy of iodine molecules was published in JJAP, the journal of the Japan Society of Applied Physics
A master's student received the Student Excellent Presentation Award at the Atom Meeting of the cold atom research group
A paper on phase control of a fiber interferometer for quantum communication was published in JJAP
ResearchResearch themes
The lab focuses on ultra-precise laser spectroscopy and studies optical frequency combs, laser cooling, optical (atomic) clocks, microparticle trapping, and related topics. Its list of research themes includes the development of ultra-stabilized lasers, spectroscopy with cold atoms, optical trapping of nanoparticles, dual-comb spectroscopy, precision spectroscopy of iodine molecules, astro-combs, and optical fiber links.
*Illustrative imageDoppler-Free Spectroscopy with a Red Laser
The lab converts a laser with a wavelength of 1.3 micrometers into red light by second harmonic generation and uses that light for Doppler-free spectroscopy. It is also working on laser frequency stabilization and on measuring laser frequencies with an optical frequency comb.
*Illustrative imageLaser Frequency References for Quantum Communication
Laser frequency control plays an important role in quantum communication. The lab is developing laser frequency and wavelength references that can actually be used on the ITU communication channels commonly used in quantum communication.
*Illustrative imageOptical Fiber Interferometers for Quantum Communication
In single-photon interference experiments, controlling the length of the optical fiber that carries the photons is essential. The lab uses different wavelength-multiplexed channels in the optical communication band for fiber-length control and for photon transmission, and conducts control experiments with optical fiber interferometers.
*Illustrative imageCooling Yb Atoms and Laser Stabilization
Laser cooling of Yb atoms is carried out with magneto-optical traps. Following the first stage using a 399 nm laser, the lab is conducting experiments on a second-stage magneto-optical trap using a 556 nm laser, along with laser frequency stabilization experiments for that purpose.
MembersFaculty
The members of the Hong-Akamatsu-Asakawa Lab consist of faculty, doctoral, master's, and undergraduate students, ROUTE students, and administrative assistants.As of 2026
- ProfessorFenglei Hong
- ProfessorDaisuke Akamatsu
- Assistant ProfessorKanta Asakawa
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Optical atomic clock ( )” National Institute of Standards and Technology / Public domain (cropped)
- Doppler-Free Spectroscopy with a Red Laser: “Red Laser Diode” Mar11 / CC BY-SA 4.0 (cropped)
- Laser Frequency References for Quantum Communication: “Light Amplification by Stimulated Emission of Radiation” 彭嘉傑 at Chinese Wikipedia / CC BY-SA 3.0 (cropped)
- Optical Fiber Interferometers for Quantum Communication: “Optical fiber cable-07ASD” Asurnipal / CC BY-SA 4.0 (cropped)
- Cooling Yb Atoms and Laser Stabilization: “Ytterbium-3” Jurii / CC BY 3.0 (cropped)
- Related lab (Horikiri-Ozawa Lab): “Full wafer of Intel quantum computers” Steve Jurvetson from Menlo Park, USA / CC BY 2.0 (cropped)
- Related lab (Kosaka-Sekiguchi Lab): “Alice in BBN laboratory - DARPA Quantum Network, January 2003” Daderot / CC0 (cropped)
- Related lab (Ohno (Shinya) Lab): “Atomic Force Microscope 02” Gannu03 / CC BY-SA 4.0 (cropped)
- Related lab (Shuto Lab): “PES Hemispherical Analyzer With Electrons And Signs” Ichwarsnur / CC BY-SA 4.0 (cropped)
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