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Ultra-Broadband Photonics (UP) Lab
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The lab develops deep ultraviolet laser sources and nonlinear optical devices.
AboutAbout the lab
Creating deep ultraviolet lasers with crystals that change the color of light.
The Ultra-Broadband Photonics Lab centers on developing deep ultraviolet laser sources, and also works on new nonlinear optical devices and thin-film technology.
The lab works with nonlinear optical crystals and devices that change the wavelength of light, and investigates a variety of nonlinear optical phenomena through both experiments and numerical simulation.
Professor Yoshimura and Assistant Professor Nambu supervise undergraduate and graduate students as a cooperating chair of the Graduate School of Engineering.
On the lab's website, it is presented under the name "Yoshimura Lab."
Key terms
- Deep ultraviolet laser
- A laser that emits deep ultraviolet light, which has an extremely short wavelength. In principle, it can be focused to a very small spot.
- Nonlinear optical crystal
- A crystal that converts laser light into light of a different wavelength.
- Laser fusion
- A technology that irradiates deuterium and tritium with laser light to compress and heat them and trigger nuclear fusion reactions.
NewsLab news
A master's student received the ALPS2026 Student Award (Poster Presentation Award)
Research results by a master's student were published in Optics Express
A master's student received the Paper Presentation Encouragement Award at the Annual Meeting of the Laser Society of Japan
A master's student and an undergraduate student received poster awards at the Institute of Laser Engineering's year-end report meeting
Assistant Professor Nambu received the Research Encouragement Award at the 17th Nanostructure Epitaxial Growth Conference
ResearchResearch themes
This lab develops crystals and devices that change the wavelength of laser light, aiming to realize deep ultraviolet lasers. It also studies optical elements that are resistant to laser-induced damage, for use in ultra-large power lasers.
Improving the quality of crystals for deep ultraviolet lasers
The lab is improving the quality of CsLiB6O10 (CLBO), a nonlinear optical crystal discovered at Osaka University. To achieve higher output for processing applications, it aims to further reduce crystal defects and, through industry-academia collaboration, to realize a high-power deep ultraviolet laser processing machine.
*Illustrative imageCompact devices for deep ultraviolet laser sources
This research uses wavelength conversion devices with fine structures built into the crystal to convert blue-violet semiconductor laser light into deep ultraviolet light. The goal is a compact, efficient deep ultraviolet laser source about the size of a fingertip.
*Illustrative imageDeveloping damage-resistant optical elements
In collaboration with European research institutions, the lab studies damage-resistant optical elements for ultra-large power lasers, which are key to laser fusion. It builds in structures on the nanometer order and also incorporates methods such as machine learning.
MembersFaculty
The members of the Ultra-Broadband Photonics Lab consist of faculty, visiting professors, researchers, secretaries, and doctoral, 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: “Ultraviolet laser effects” www.LaserLightShow.ORG / CC BY-SA 3.0 (cropped)
- Compact devices for deep ultraviolet laser sources: “Excimer laser 1” IoOALP / CC BY-SA 4.0 (cropped)
- Developing damage-resistant optical elements: “Optical coating - Polarizer - CILAS” CILAS / CC BY-SA 3.0 (cropped)
- Related lab (Power Photonics (PLP) Lab): “Table Mountain Facility Sends DSOC Laser Beacon to NASA’s Psyche (Infrared Image) (PIA26661)” JPL / Public domain (cropped)
- Related lab (Laser Materials Science (LMO) Lab): “High-power laser welding” Krorc / CC BY-SA 3.0 (cropped)
- Related lab (Materials and Applied Technology (MAT) Lab): “6 Maiman Laser Ruby Crystal” Guy Immega / CC0 (cropped)
- Related lab (Power Laser Systems Engineering (PLS) Lab): “VULCAN laser hall with disc amplifiers 1986” Colin N. Danson et al. / CC BY 4.0 (cropped)
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