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Kozawa Lab
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A lab that manipulates the spatial structure of light for use in measurement and processing.
AboutAbout the lab
Changing light itself, starting from its shape
Drawing on its strengths in laser technology and wavefront control, the Kozawa Lab conducts applied research based on the interaction between light and matter.
Basic properties of light such as intensity, phase, and polarization are usually spread uniformly across the cross-section of a beam.
It has become clear that designing their distribution in space gives rise to new properties that did not exist before.
Using such light, the lab is expanding applications to optical imaging, measurement, laser processing, and optical trapping.
Key terms
- Polarization
- The direction in which the waves of light oscillate. The direction can be aligned or rotated.
- Vector beam
- A light beam whose polarization direction varies from place to place across its cross-section. Radially polarized and azimuthally polarized beams are examples.
- Super-resolution
- A technique that distinguishes details finer than an ordinary optical microscope can resolve.
NewsLab news
A paper on an electron lens using vector beams was published in Physical Review Research
A paper on two-photon super-resolution microscopy was published in Biomedical Optics Express
A paper on highly efficient, high-precision three-dimensional surface measurement was published
A paper on an optical electron lens and spherical aberration correction was published in Physical Review A
A review paper on holography technology was published
ResearchResearch themes
The lab conducts applied research that controls light itself and makes use of the new properties that result. It is particularly interested in the spatial distribution of intensity, polarization, and amplitude across the cross-section of a light beam, and works on high-performance optical imaging, laser micromachining, and interaction with matter.
*Illustrative imageGeneration of light with spatial structure
The lab creates light beams whose intensity, phase, and polarization distributions are designed in space. Its work ranges widely, from developing sources that produce vector beams and optical vortex beams, to clarifying their focusing properties and developing applications.
*Illustrative imageHigh-performance laser microscopy
The lab uses the spatial structure of light to improve the performance of laser scanning microscopes. It is developing super-resolution fluorescence imaging and needle microscopy, which obtains a three-dimensional image from a single two-dimensional scan.
*Illustrative imageLaser micromachining technology
By controlling the distribution of intensity and polarization near the focus of a femtosecond pulsed laser, the lab improves the resolution and precision of processing. It works on nanofabrication with radially polarized beams and interference-fringe processing of thin films.
*Illustrative imageInteraction between laser light and electrons
The lab is developing electron microscope components that use laser light to manipulate electron beams, by exploiting stimulated scattering between light and free electrons.
MembersFaculty
The members of the Kozawa Lab consist of faculty, administrative assistants, and master's students.As of 2026
- ProfessorYuichi Kozawa
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: “Argon laser beam and diffraction mirror” Lazord00d / CC BY-SA 3.0 (cropped)
- Generation of light with spatial structure: “Square diffraction” V81, from the English Wikipedia / Public domain (cropped)
- High-performance laser microscopy: “Multicolor fluorescence image of living HeLa cells” 8x57is / CC BY-SA 4.0 (cropped)
- Laser micromachining technology: “Laser cutting of a thick steel plate” Chutianlaser / CC BY-SA 3.0 (cropped)
- Interaction between laser light and electrons: “Ernst Ruska Electron Microscope - Deutsches Museum - Munich” J Brew / CC BY-SA 2.0 (cropped)
- Related lab (Takeda-Zhu Lab): “Molten Flinak Salt” Brian Kelleher / CC BY-SA 3.0 (cropped)
- Related lab (Xu-Uchiyama Lab): “Триболюминесценция в кварце” Yaroslav Ulyushin / CC BY 4.0 (cropped)
- Related lab (Kumagai Lab): “NIO defect surface” Dmurra01 / CC BY-SA 3.0 (cropped)
- Related lab (Ohara-Nagakubo Lab): “35th MXS Nondestructive Inspection Airmen ensure safety and mission readiness (9240945)” U.S. Air Force photo by Senior Airman Patrick Boyle / Public domain (cropped)
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