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Extreme Quantum Optics Lab
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The lab develops new light sources and spectroscopic methods to measure and control the behavior of matter in situ.
AboutAbout the lab
Creating new light to observe matter as it happens
The Extreme Quantum Optics Lab develops new light sources and spectroscopic methods, and uses light to measure and control material properties in real time.
The Adachi Group conducts basic and applied research focused on the spins of electrons, holes, and nuclei in semiconductor nanostructures.
The Sekikawa Group studies the interaction between the intense optical fields produced by ultrashort-pulse lasers and atoms and molecules.
Using ultrashort extreme ultraviolet pulses generated by high-order harmonics, the lab follows reactions that proceed on femtosecond timescales.
Key terms
- Spin
- A property of electrons and atomic nuclei that gives rise to behavior like that of a tiny magnet
- High-order harmonics
- Light with a frequency tens of times higher than the original, generated when intense laser light strikes atoms or molecules
- Photoelectron spectroscopy
- A method of probing the electronic states of a material from the energy of electrons ejected when light strikes it
NewsLab news
A paper on an ultrashort-pulse deep-ultraviolet light source was published in Optics Letters
A paper on a broadband retarder for the extreme ultraviolet region was published in Applied Optics
A paper from joint research with the Faculty of Science was published in J. Phys. Chem. A
A paper on circularly polarized high-order harmonic pulses was published in Optics Express
A master's student received a Poster Award from the Japan Society of Applied Physics
ResearchResearch themes
The lab develops new light sources and spectroscopic methods, and uses them to measure and control material properties in real time with light, aiming to open up new physics and technology. It has two groups: the Adachi Group, which works on spins in semiconductor nanostructures, and the Sekikawa Group, which works on the interaction between intense optical fields and atoms and molecules.
*Illustrative imageSpins in semiconductor nanostructures
The lab explores properties related to the spins of electrons, holes, excitons, and nuclei in semiconductor nanostructures, with the aim of controlling spins using light. It also develops the supporting techniques, including highly sensitive time-resolved optical measurements and imaging spectroscopy.
*Illustrative imageElectron and nuclear spins in quantum dots
The spin of an electron in a single quantum dot is coupled through hyperfine interaction to the nuclear spins of the tens of thousands of atoms that make up the dot. Because localized electrons have long spin relaxation times, they can interact with nuclear spins for a long time. The lab studies the mechanism by which a large nuclear spin polarization is produced.
*Illustrative imageDevelopment of a time-delay-compensated monochromator
Because high-order harmonics travel along the same path as the laser light used to generate them, separating them by harmonic order has long been a challenge. The lab built a monochromator that uses two diffraction gratings to cancel pulse stretching, and succeeded in obtaining extreme ultraviolet light with a pulse duration of 11 femtoseconds.
*Illustrative imageTime-resolved photoelectron spectroscopy of molecules
Photoelectron spectroscopy is a method of probing electronic states from the energy of electrons ejected when light strikes a sample. The lab irradiates gas-phase molecules with high-energy light from high-order harmonics and observes, with high time resolution, how molecular bonds break during chemical reactions.
MembersFaculty
The members of the Extreme Quantum Optics Lab consist of faculty and doctoral, master's, and undergraduate students.As of 2026
- ProfessorSatoru Adachi
- Project ProfessorHiroomi Nakajima
- Associate ProfessorTaro Sekikawa
- Associate ProfessorReina Kaji
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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: “405nm” Netweb01 / CC BY-SA 3.0 (cropped)
- Spins in semiconductor nanostructures: “12-inch silicon wafer” Peellden / CC BY-SA 3.0 (cropped)
- Electron and nuclear spins in quantum dots: “CdTe quantum dots plasmachem” PlasmaChem GmbH, Berlin, Germany. Original uploader was Antipoff at en.wikipedia / CC BY-SA 4.0 (cropped)
- Development of a time-delay-compensated monochromator: “An incandescent light-bulb viewed through a transmissive diffraction grating” © Robert D. Anderson / CC BY-SA 3.0 (cropped)
- Time-resolved photoelectron spectroscopy of molecules: “1,2-Butadiene-3D-balls” Jynto and Ben Mills / Public domain (cropped)
- Related lab (Semiconductor Quantum Engineering Lab): “Gallium Arsenide (GaAs) 2" wafer” La2O3 / CC BY-SA 3.0 (cropped)
- Related lab (Optical Properties Engineering Lab): “FemtosecondLaserAction” Шмелёв Артемий Геннадьевич / CC BY-SA 3.0 (cropped)
- Related lab (Quantum Functional Engineering Lab): “Optical Therapeutics and Medical Nanophotonics Laboratory ( )” The U.S. Food and Drug Administration / Public domain (cropped)
- Related lab (Condensed Matter Physics Engineering Lab): “CdTe quantum dots” Ruslan.Ka / CC BY 4.0 (cropped)
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