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Processing Physics Lab (CATs-Lab)
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A lab that uses lasers to microfabricate diamond and glass.
AboutAbout the lab
Uncovering and harnessing the physics of processing
The Processing Physics Lab (CATs-Lab) studies the physical phenomena that occur during processing, with microfabrication as its core.
Using special lasers such as femtosecond lasers, the lab develops ultrafast, high-precision microfabrication techniques.
It also works on processing hard-to-machine materials such as diamond and glass with high efficiency and precision.
The lab aims to give functions to the surface and interior of glass, leading to applications in areas such as semiconductors.
Key terms
- Microfabrication
- Processing that cuts or reshapes materials at scales finer than a millimeter
- Ultrashort-pulse laser
- A laser that emits light for only an extremely short time. It can alter the material only near the focal point
- Brittle material
- A material, such as glass or ceramics, that breaks with almost no deformation
NewsLab news
A paper on laser slicing of diamond was published in Diamond and Related Materials, and a press release was issued
A paper on laser processing of silver precipitates in glass was published in Applied Physics A
A technique for measuring the depth and penetration of laser processing was announced in a press release
A paper on forming through-holes in glass was published in Optics & Laser Technology
A paper on the joint strength of forge welding was published in the Journal of the Japan Society for Abrasive Technology
ResearchResearch themes
With microfabrication at its core, the lab works on a wide range of topics, from elucidating the physical phenomena that occur during processing to their applications. It develops processing techniques using special lasers and works on processing difficult-to-machine materials such as diamond and glass.
*Illustrative imageLaser Slicing of Diamond
Diamond is expected to be a next-generation semiconductor material, but it is extremely hard and difficult to cut into thin wafers. The lab is developing a technique that focuses an ultrashort-pulse laser inside the diamond to create a modified region and microcracks, then separates the diamond along the targeted plane.
*Illustrative imageSilver Precipitation in Glass
This lab discovered that silver can be precipitated inside glass by solid-state ion exchange under an applied voltage. The lab aims to control the shape of the precipitated silver as intended, leading to wiring and hole-drilling inside glass.
*Illustrative imageMetal Sphere Manipulation
When a metal foil is placed in close contact with glass and irradiated with a laser, a metal sphere forms in the molten glass. As the irradiation continues, the sphere moves, and the refractive index of the glass changes along its path. The lab aims to use this to give glass new functions.
*Illustrative imageWheel Cleaving
Wheel cleaving is a processing technique for brittle materials in which a disk-shaped tool is pressed against the material to create a crack, and the material is then separated by an external force. Although the process is simple, it is operated on empirical rules, so the lab aims to capture the processing phenomena and elucidate the mechanism.
MembersFaculty
The members of the Processing Physics Lab consist of faculty, a secretary, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorHirofumi Hidai
- ProfessorSota Matsusaka
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: “Light Amplification by Stimulated Emission of Radiation” 彭嘉傑 at Chinese Wikipedia / CC BY-SA 3.0 (cropped)
- Laser Slicing of Diamond: “Single-crystal CVD diamond disc” Matthias Schreck, Stefan Gsell, Rosaria Brescia & Martin Fischer / CC BY-SA 4.0 (cropped)
- Silver Precipitation in Glass: “Ion exchange-glass-melt” Jafari.milad / CC BY-SA 4.0 (cropped)
- Metal Sphere Manipulation: “Laser glass slab” 作者不詳 / Public domain (cropped)
- Wheel Cleaving: “Glassnijder” Rasbak / CC BY-SA 3.0 (cropped)
- Related lab (Aoki Lab): “Molybdenite in quartz” Eurico Zimbres Zimbres / CC BY-SA 3.0 (cropped)
- Related lab (Quantum Device Physics Lab): “Close-up of glass crystal with many facets causing dispersion spectrum from light” Pittigrilli / CC BY-SA 4.0 (cropped)
- Related lab (Matsubayashi Lab): “Ceramographic sections” His Manliness (talk) 04:59, 2 December 2008 (UTC) / Public domain (cropped)
- Related lab (Electrical Energy Applications Lab): “Superconductor” Edosz2010 / CC BY 4.0 (cropped)
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