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Kobayashi Lab
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The lab builds its own new lasers to see what could not be seen before.
AboutAbout the lab
Building lasers to pioneer new spectroscopy
The Kobayashi Lab conducts research and development on cutting-edge lasers, as well as applied research that uses them.
Its research style is to pioneer spectroscopic methods that did not exist before by freely designing and building lasers.
The optical frequency comb emerged from the fusion of two technologies: one that increases spectral purity and one that shortens pulses to the extreme.
Applications span a wide range of fields, from combs for optical lattice clocks to photoelectron spectroscopy using vacuum ultraviolet light and building the scientific foundations of laser processing.
Key terms
- Optical frequency comb
- A set of optical frequencies lined up at equal intervals like the teeth of a comb. It serves as a ruler for accurately measuring the frequency of light.
- Femtosecond laser
- A laser that emits extremely short light pulses, on the order of one quadrillionth of a second (10^-15 s).
- Mode-locked laser
- A laser in which the phases of the light inside the cavity are aligned so that it emits short pulses one after another.
NewsLab news
Electronic states at the edges of MoS2 cut with a laser observed in a joint study
Fine laser processing of next-generation semiconductor glass substrates achieved
Joint study clarifies the mechanism behind why the lifetime and intensity of luminescence differ from metal to metal
Press release on semiconductor back-end processes published
ResearchResearch themes
The lab conducts research and development on quantum electronics, especially cutting-edge lasers, as well as applied research. Because there are many types of lasers and a wide range of applications, the lab carries out research jointly with research institutions in Japan and abroad.
*Illustrative imageBuilding the Science of Laser Processing
Why a laser can cut things is, in fact, still not understood. The lab is clarifying how phenomena at scales that differ by orders of magnitude are connected, from the fundamental processes of cutting to actual processing.
*Illustrative imageThe World's Smallest Femtosecond Laser
The lab miniaturized a Kerr-lens mode-locked laser, which is capable of emitting the shortest pulses in the world, and built the smallest one in the world. A smaller laser has a faster pulse repetition rate, which makes it possible to perform spectroscopy that resolves the optical modes one by one.
*Illustrative imageExtremely Stable CW Lasers
The lab stabilizes continuous-wave lasers to optical cavities made of glass that expands very little with heat. By giving the cavity a shape that is resistant to deformation from vibration, the lab improves the long-term stability of the resonant frequency.
*Illustrative imageOptical Frequency Combs Linking Optical Atomic Clocks
An optical frequency comb bridges the microwave world, which electronic circuits can count, and the optical world of atomic resonance. To compare optical atomic clocks with one another, the lab is developing stable ytterbium-doped fiber combs.
MembersFaculty
The members of the Kobayashi Lab consist of faculty, technical staff and academic specialist staff, researchers, commissioned researchers and collaborative researchers, secretaries, doctoral and master's students, and research trainees.As of 2026
- ProfessorKobayashi YoheiPublications ↗
- Assistant ProfessorKotaro Nakagawa
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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 and Pulse Compressor - Optics Lab - INRIM” Giorgio Brida from Torino, Italy / CC BY 2.0 (cropped)
- Building the Science of Laser Processing: “Bauteil Laserpoliert” Bestemrc / CC BY-SA 4.0 (cropped)
- The World's Smallest Femtosecond Laser: “Titanium sapphire oscillator” Hankwang / CC BY 2.5 (cropped)
- Extremely Stable CW Lasers: “Fabry-perot-interferometer” Geek3 / CC BY-SA 4.0 (cropped)
- Optical Frequency Combs Linking Optical Atomic Clocks: “Ytterbium Optical Lattice Clock purple and green light” NMIJ, National Metrology Institute of Japan / CC BY-SA 3.0 (cropped)
- Related lab (Shibauchi-Ishida Lab): “Quantum locking” Maxim Bilovitskiy / CC BY-SA 4.0 (cropped)
- Related lab (Koashi Lab): “New Quantum Key System Combines Speed, Distance ( )” National Institute of Standards and Technology / Public domain (cropped)
- Related lab (Complex Fluid Physics Lab): “Colloid lithography, artificial opal, polystyrene” Simpik / CC BY-SA 4.0 (cropped)
- Related lab (Sato Lab): “Boerdijk-Coxeter helices” Carsten Steger / CC BY-SA 4.0 (cropped)
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