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Plasma Environmental Process Lab
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The lab uses lasers to see inside plasma, for applications in manufacturing and the environment.
AboutAbout the lab
Making plasma an industrial star performer.
The Plasma Environmental Process Lab studies how to put plasma to use in industrial and environmental technologies.
Plasma is widely used in industry, for example in materials processing, but users often say it is "incomprehensible" or "impossible to control."
The lab develops methods that use lasers to probe the inside of plasma, and works on technologies for producing ammonia and hydrogen as well as on reactions between liquids and plasma.
Students are welcome regardless of their undergraduate field, and applicants to the graduate school from other universities or from advanced courses at technical colleges (KOSEN) are also welcome.
Key terms
- Plasma
- A state in which the atoms or molecules of a gas are separated into electrons and ions. It conducts electricity, glows, and readily triggers reactions.
- Atmospheric-pressure plasma
- Plasma generated at ordinary air pressure, without vacuum equipment.
- Catalyst
- A substance that makes a chemical reaction proceed more easily but is itself unchanged before and after the reaction.
NewsLab news
A doctoral student received the Japan Society of Applied Physics Plasma Electronics Presentation Encouragement Award at the Plasma Processing Symposium
A doctoral student received the Presentation Encouragement Award at the 59th (Autumn 2025) Japan Society of Applied Physics meeting
A researcher received a Poster Award at ISPlasma2025/IC-PLANTS2025
ResearchResearch themes
The lab aims to make plasma usable in advanced industrial fields such as materials processing, and researches ways to broaden its range of applications. Its work includes laser-based plasma diagnostics, development of new plasma sources, material synthesis and hydrogen production using plasma, and interactions between plasma and liquids.
*Illustrative imageProbing the inside of plasma with lasers
The lab is developing methods to investigate the inside of plasma, which cannot be understood just by observing it from outside, by shining laser light into it. By examining how atoms, molecules, electrons, and fine particles absorb and scatter the laser light, the lab measures quantities that no other method can provide.
*Illustrative imageDeveloping atmospheric-pressure plasma devices
The lab develops atmospheric-pressure plasma sources that do not require vacuum equipment. With an atmospheric-pressure plasma jet that uses no noble gas, the lab observed that adding a small amount of oxygen produces a green plasma emitting the same light as an aurora.
*Illustrative imageProducing ammonia with plasma
Ammonia is a raw material for fertilizer and is also being considered as a carrier of energy. Until now it has been produced in large-scale facilities, and the lab is developing plasma devices for synthesizing ammonia on a small to medium scale.
*Illustrative imageProducing organic compounds with plasma
Using the interaction between plasma and liquids, the lab succeeded in converting benzene directly into phenol using only water, air, and electricity, without a catalyst.
MembersFaculty
The members of the Plasma Environmental Process Lab consist of faculty, secretaries, students in the doctoral program (including working professionals), master's program, and undergraduate program, and collaborators.As of 2026
- ProfessorKoichi Sasaki
- Associate ProfessorNaoki Shirai
- Assistant ProfessorYoshinobu Inagaki
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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: “Plasma-lamp 2” Luc Viatour / CC BY-SA 3.0 (cropped)
- Probing the inside of plasma with lasers: “Argon laser beam and diffraction mirror” Lazord00d / CC BY-SA 3.0 (cropped)
- Developing atmospheric-pressure plasma devices: “Aurora in Abisko near Torneträsk” Pavel.shyshkouski / CC BY-SA 4.0 (cropped)
- Producing ammonia with plasma: “Nitrogen-glow” Jurii / CC BY 3.0 (cropped)
- Producing organic compounds with plasma: “Water plasma” Original uploader was Sfusare at en.wikipedia. A later version was uploaded by Equazcion also at en.wikipedia. / CC BY-SA 3.0 (cropped)
- Related lab (Plasma Materials Engineering Lab): “Plasma generation in air” Rcaravit / CC BY 4.0 (cropped)
- Related lab (Plasma Bio-Application Engineering Lab): “LHD plasma vacuum vessel” National Institute for Fusion Science / CC BY-SA 4.0 (cropped)
- Related lab (Space Environment Systems Engineering Lab): “Rocket Engine Hot Fire” camelNotation / CC0 (cropped)
- Related lab (Space Environment Applied Engineering Lab): “Candle Flame in Microgravity” NASA / Public domain (cropped)
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