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Tokurakawa Lab
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A lab that develops its own ultrashort-pulse and mid-infrared laser sources.
AboutAbout the lab
Developing light sources and studying their applications entirely in-house
The Tokurakawa Lab develops high-intensity ultrashort-pulse laser sources, centered on the 2 μm wavelength band, and studies their applications.
Laser sources are an important technology supporting Japanese industry and academia, but most are now imported from overseas, and the latest sources are sometimes unavailable in Japan.
The lab therefore aims to develop and use cutting-edge lasers that are not on the market.
Its long-term goal is a tabletop-sized, high-brightness light source that bridges soft X-rays, the mid-infrared, and terahertz (THz) regions.
Key terms
- Ultrashort-pulse laser
- A laser that emits light for only an extremely short time, on the order of picoseconds or femtoseconds
- Fiber laser
- A laser that amplifies light and produces laser oscillation inside an optical fiber
- Mid-infrared
- The infrared region with wavelengths of 2–20 μm, which includes the "fingerprint region" where each molecule has characteristic absorption
NewsLab news
A doctoral student received a Poster Award at the UFO Committee
A doctoral student received an Excellence Award at the international conference ALPS
A master's student received the Outstanding Presentation Award at the Optical Engineering Program master's thesis presentation and the Outstanding Poster Presentation Award at the Laser Society of Japan Tokyo Branch research meeting
A master's student received an Outstanding Poster Award at the Japan Society of Polymer Processing
A master's student received the Branch Chair Award at the Laser Society of Japan Tokyo Branch research meeting
ResearchResearch themes
The Tokurakawa Lab studies new light sources with the long-term goal of a tabletop-sized, high-brightness source that bridges soft X-rays, the mid-infrared, and THz regions. In collaboration with companies and universities in Japan and abroad, it works on the development and application of high-intensity laser sources in the 2 μm wavelength band.
*Illustrative imageA tabletop light source bridging soft X-rays to THz
The lab is developing ultrashort-pulse light sources in the 2–2.5 μm band using Tm-, Ho-, and Cr-doped solid-state lasers. Next, starting with higher-power Ho lasers, it aims to develop high-brightness light sources covering the ultraviolet to soft X-ray region and the 2–20 μm band.
*Illustrative imageUltrashort-pulse Ho laser in the 2.1 μm band
Ho can lase in the 2.1 μm band when pumped in the 1.9 μm band. Because Tm fiber lasers with diffraction-limited beam quality can be used as pump sources, cavity designs that are difficult with Yb lasers become possible. The lab is developing high-energy mode-locked oscillators with repetition rates of 1–10 MHz.
*Illustrative imageHigh-power Ho laser amplifier
Using a Tm fiber pump source with an average power of 100 W or more and diffraction-limited beam quality, the lab is developing a chirped-pulse amplifier with an average power of 50–100 W and a repetition rate of 100 kHz–10 MHz.
*Illustrative imageHigh-power Tm fiber laser
The lab is developing a high-power Tm fiber laser operating in the 1900–1950 nm band as a pump source for Ho-doped solid-state lasers. The goal is a turnkey system that is maintenance-free for long periods, with a maximum output of 200 W (random polarization) and 100 W (single polarization).
MembersFaculty
The members of the Tokurakawa Lab consist of faculty, doctoral, master's, and undergraduate students, and collaborative researchers.As of 2026
- Associate ProfessorMasaki Tokurakawa
VoicesStudent voices
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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: “Fiber laser cutting machine” Messer Cutting Systems India / CC0 (cropped)
- A tabletop light source bridging soft X-rays to THz: “Nd laser VisNatural” FDominec / CC BY-SA 3.0 (cropped)
- Ultrashort-pulse Ho laser in the 2.1 μm band: “Infrared (1064 nm) Laser Beams and Pre-Mode Cleaner” Tobin from Rochester, NY, USA / CC BY-SA 2.0 (cropped)
- High-power Ho laser amplifier: “Laser with amplifier” Tourbillon / CC BY-SA 3.0 (cropped)
- High-power Tm fiber laser: “Combined-fiber laser diagram” SMDCARSTRAT image, Official Web-site of the United States Army / Public domain (cropped)
- Related lab (Yoneda Lab): “European XFEL DESY Undulator” Dirtsc / CC BY-SA 3.0 (cropped)
- Related lab (Haruka Tanji Lab): “Optical cavities” No machine-readable author provided. Fffred~commonswiki assumed (based on copyright claims). / Public domain (cropped)
- Related lab (Hirata Lab): “Fluorescent dye” Swastipandey / CC BY-SA 4.0 (cropped)
- Related lab (Katsuragawa Lab): “Starfire Optical Range - sodium laser” 作者不詳 / Public domain (cropped)
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