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Yoshioka Lab
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The lab uses highly controlled laser light to precisely measure and manipulate matter.
AboutAbout the lab
Precisely measuring matter with controlled light.
The Yoshioka Lab conducts research on precisely observing and controlling matter using highly controlled laser light.
Its current main projects include cooling and precision spectroscopy of gases of positronium and neutral carbon atoms, and Bose-Einstein condensation of excitons.
Through the science of light, the lab aims to solve mysteries of physics and to develop technologies that will benefit future society.
The lab places importance on building experimental equipment by hand, and makes its own laser sources and control circuits.
Key terms
- Optical frequency comb
- Laser light made up of light of known frequencies lined up at equal intervals, like the teeth of a comb. It serves as a ruler for accurately measuring the frequency of light.
- Exciton
- A state in a semiconductor that has absorbed light, in which an electron and its vacancy, called a hole, are bound together like a hydrogen atom.
- Bose-Einstein condensation
- A phenomenon in which, at extremely low temperatures, many particles gather in the same quantum state and the whole behaves like a single wave.
NewsLab news
An undergraduate student was selected for the Outstanding Graduation Thesis Award of the Department of Applied Physics
Laser cooling research was selected as one of Physics World's Top 10 of the year
Associate Professor Yoshioka received the Sir Martin Wood Prize
Paper on laser cooling of positronium published in Nature
A doctoral student received the Outstanding Student Presentation Award from the Physical Society of Japan
ResearchResearch themes
The lab aims to measure and control matter at unprecedented levels of precision, using light controlled to the extreme in both frequency and time. Through such measurements, its goal is to develop technologies that help solve long-standing mysteries of physics and lay the foundation for future optical technologies.
*Illustrative imageFemtosecond Optical Frequency Combs
The lab precisely controls two frequencies of a femtosecond laser to build optical frequency combs, which accurately measure the frequency of light. It is also developing astro-combs for astronomical observation and other applications.
*Illustrative imageBose Condensation of Excitons
This research cools excitons in semiconductors to extremely low temperatures, using equipment such as dilution refrigerators, and condenses them. In collaboration with a lab in the Graduate School of Science, the lab became the first in the world to succeed in observing a condensate formed by excitons.
*Illustrative imageLaser Cooling of Positronium
This research uses lasers to cool positronium, an atom made of an electron and a positron, and performs precision spectroscopy on it. In collaboration with the Graduate School of Science and the High Energy Accelerator Research Organization (KEK), among others, the lab achieved the world's first laser cooling of positronium.
MembersFaculty
The members of the Yoshioka Lab are faculty members, doctoral, master's, and undergraduate students, and visiting researchers.As of 2024
- ProfessorKosuke YoshiokaPublications ↗
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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: “Femtosecond laser filament” Onlywww / CC BY 4.0 (cropped)
- Femtosecond Optical Frequency Combs: “Femtosecond laser spark” Smirnov Semen / CC BY 4.0 (cropped)
- Bose Condensation of Excitons: “Bose Einstein condensate” NIST/JILA/CU-Boulder / Public domain (cropped)
- Laser Cooling of Positronium: “Positronium Beam - positron source” UCL Faculty of Mathematical & Physical Sciences / CC BY 2.0 (cropped)
- Related lab (Yoneda Lab): “Dilution Fridge 009 8K” OJB Quantum / CC BY 4.0 (cropped)
- Related lab (Endo Lab): “Infrared (1064 nm) Laser Beams and Pre-Mode Cleaner” Tobin from Rochester, NY, USA / CC BY-SA 2.0 (cropped)
- Related lab (Ashihara Lab): “Femtosecond Laser and Pulse Compressor - Optics Lab - INRIM” Giorgio Brida from Torino, Italy / CC BY 2.0 (cropped)
- Related lab (Ishizaka Lab): “Sample holder in ultrahigh vacuum chamber for angle-resolved photoemission spectroscopy” Ponor / CC BY-SA 4.0 (cropped)
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