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Photon and Quantum Devices Lab [Institute of Laser Engineering]
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The lab makes crystals and devices that change the wavelength of light, aiming to realize deep-ultraviolet lasers.
AboutAbout the lab
Making crystals and devices that change the wavelength of light
The Photon and Quantum Devices research area (Yoshimura Lab) studies nonlinear optical crystals that change the wavelength of laser light, as well as devices for deep-ultraviolet lasers.
Professor Masashi Yoshimura's group works on reducing crystal defects, aiming to realize high-power deep-ultraviolet laser processing machines through industry-academia collaboration.
Assistant Professor Tomoaki Nambu's group studies fingertip-sized compact deep-ultraviolet laser sources and "unbreakable" optical elements for ultra-large power lasers.
As a cooperating chair of the School of Engineering and the Graduate School of Engineering, the lab is in charge of research supervision for undergraduate and graduate students.
Key terms
- Nonlinear optical crystal
- A crystal that can convert incident laser light into light of a different wavelength
- Deep-ultraviolet laser
- A laser in the ultraviolet range with an extremely short wavelength. In principle, it can be focused to a very small spot
- Laser fusion
- A technology that irradiates deuterium and tritium with high-power laser light to compress and heat them, causing on Earth a fusion reaction like that of the Sun
NewsLab news
A master's student received the ALPS2026 Student Award (Poster Presentation Award)
A master's student's research results were published in Optics Express
A master's student received the Encouragement Award for Paper Presentation at the Laser Society of Japan Annual Meeting
A student received a poster award at the Institute of Laser Engineering's year-end report meeting
Assistant Professor Nambu received the Research Encouragement Award at the Nanostructure Epitaxial Growth Lecture Meeting
ResearchResearch themes
The lab makes crystals and devices that change the wavelength of laser light, aiming to realize deep-ultraviolet laser processing machines and optical elements for ultra-large power lasers. Professor Yoshimura works on reducing crystal defects, while Assistant Professor Nambu works on compact light sources and unbreakable optical elements.
*Illustrative imageHigher-quality crystals for deep-ultraviolet lasers
Using a deep-ultraviolet laser with a wavelength of 266 nm to drill microscopic holes in substrates requires extremely high output power, but current crystals suffer problems such as laser damage. The lab aims to reduce crystal defects further and to realize high-power processing machines through industry-academia collaboration.
*Illustrative imageFingertip-sized deep-ultraviolet laser sources
The lab studies devices that convert the wavelength of a blue-violet semiconductor laser into deep-ultraviolet light using crystals with finely engineered structures. The aim is to make the light source, for which large and expensive gas lasers are currently the mainstream, compact and efficient.
*Illustrative imageDevelopment of unbreakable optical elements
For the next-generation ultra-large power lasers that are key to laser fusion, the lab studies "unbreakable" optical elements in collaboration with European research institutions. The lab engineers structures on the nanometer scale and also uses state-of-the-art equipment and machine learning.
MembersFaculty
The Yoshimura Lab's members consist of faculty, visiting professors, researchers, secretaries, and master's and undergraduate students.As of 2026
- ProfessorMasashi Yoshimura
- Assistant ProfessorTomoaki Nambu
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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: “Extreme ultraviolet (EUV) frequency comb ( )” National Institute of Standards and Technology / Public domain (cropped)
- Higher-quality crystals for deep-ultraviolet lasers: “Laser-iron PCB 3 - etched, drilled 04” Retired electrician / CC0 (cropped)
- Fingertip-sized deep-ultraviolet laser sources: “Hood Ultraviolet Light” Alyssa LaGrange / CC BY 4.0 (cropped)
- Development of unbreakable optical elements: “The first 22-watt sodium laser of the Adaptive Optics Facility” ESO / CC BY 4.0 (cropped)
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