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Quantum Optoelectronics Lab
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A lab that builds ultrashort-pulse lasers with optical fibers and applies them to measurement.
AboutAbout the lab
New optical technologies with ultrashort-pulse lasers
Nishizawa Lab researches new laser technologies and laser measurement technologies.
Using optical fibers, the lab builds ultrashort-pulse laser sources, which emit light for only an extremely short time, and controls that light freely.
With the sources it has developed, the lab is developing optical frequency combs, ultrabroadband light, and technologies for measuring living tissue.
Lasers are used in a wide range of fields, from basic research to industry and medicine, and the development of new applications is anticipated.
Key terms
- Ultrashort pulse
- Pulsed laser light that shines for only an extremely short time. Its time width is very narrow, and it can produce intense light.
- Optical frequency comb
- Laser light whose components are lined up at equal intervals like the teeth of a comb. It serves as a ruler for precision measurement.
- OCT
- Optical coherence tomography. A technology that uses light interference to image cross sections of the interior of living tissue and other samples without contact or damage.
NewsLab news
View More ↗ResearchResearch themes
Aiming to create new laser technologies and laser measurement technologies, the lab develops cutting-edge, practical ultrashort-pulse fiber laser sources covering the visible to mid-infrared range. Using these sources, it is developing optical frequency combs, ultrabroadband supercontinuum light, and technologies for measuring living tissue.
*Illustrative imageUltrashort-pulse fiber lasers
The lab develops ultrashort-pulse fiber laser sources using single-walled carbon nanotubes and nonlinear optical effects that occur inside optical fibers. Its results include generating extremely short pulses in the optical communication wavelength band.
*Illustrative imageOptical frequency comb sources
When the spectrum of ultrashort-pulse light is examined, its components are lined up at equal intervals like the teeth of a comb. Aiming at ultra-high-precision measurement and new applications of light, the lab develops optical frequency comb sources from the near-infrared to the mid-infrared based on fiber lasers.
*Illustrative imageGenerating ultrabroadband light
Using nonlinear optical effects in optical fibers, the lab has succeeded in developing sources of ultrabroadband light (supercontinuum light) with a flat spectrum across a wide range of wavelengths. Taking advantage of this breadth and flatness, it is extending the work to high-precision spectroscopic measurement and the generation of extremely short pulses.
*Illustrative imageUltrahigh-resolution optical tomography
OCT is a technology for measuring cross sections of the interior of living tissue and other samples without contact or damage, and it is widely used in medicine and biology. The lab develops ultrahigh-resolution OCT using the ultrabroadband fiber laser sources it has developed itself.
MembersFaculty
Nishizawa Lab consists of faculty members, doctoral, master's, and undergraduate students, and secretaries.As of 2025
- ProfessorNorihiko Nishizawa
- LecturerShotaro Kitajima
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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: “Ti Sapphire laser TIS-SF-07” Sergey100 / Public domain (cropped)
- Ultrashort-pulse fiber lasers: “Optical fiber in protective coating that transports a Laser beam - Laser Physics Lab - NTNU-NT” NTNU, Faculty of Natural Sciences and Technology / CC BY 2.0 (cropped)
- Optical frequency comb sources: “Comb Apparatus ( )” National Institute of Standards and Technology / Public domain (cropped)
- Generating ultrabroadband light: “Additive colour mixing of focused light (cropped)” Anatolii Kashchuk / CC BY-SA 4.0 (cropped)
- Ultrahigh-resolution optical tomography: “Nd-YAG laser” Thctamm / CC BY-SA 3.0 (cropped)
- Related lab (Nano Information Devices Lab): “Wafer” Santi / CC BY-SA 2.0 (cropped)
- Related lab (Optoelectronics Lab): “Laser experiment - Photonics Laboratory - Physics Department - Ateneo de Manila University” Physics Department Ateneo de Manila University / CC BY 2.0 (cropped)
- Related lab (Cryptography and Information Security Lab): “Enigma Crypto Machine - Flickr - Latente 囧 www.latente.it” ☰☵ Michele M. F. / CC BY-SA 2.0 (cropped)
- Related lab (Life Electronics Lab): “Plasma-filaments” The original uploader was Iantresman at English Wikipedia. / CC BY 2.5 (cropped)
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