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Optical Quantum Physics Lab
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The lab aims to create optical vortices, light that traces a spiral, and use them to measure and manipulate matter.
AboutAbout the lab
Measuring and manipulating matter with spiraling light
The Optical Quantum Physics Lab studies quantum physics using lasers.
At its center is a new kind of light called an "optical vortex," which carries orbital angular momentum.
The lab combines techniques for creating optical vortices with techniques for making laser light high-intensity and ultrashort-pulsed, as well as nonlinear optics.
It aims to apply this to the search for new physical properties, the control and processing of materials, and ultra-high-precision measurement.
Key terms
- Optical vortex
- Light that carries orbital angular momentum and travels along a spiral
- Orbital angular momentum
- The rotational momentum carried by a particle of light (a photon), corresponding to revolution around an axis rather than spin
- Ultrashort pulse
- Laser light, like a flash, that shines for only a very short time
ResearchResearch themes
Since a method for generating optical vortices carrying orbital angular momentum was developed in 1992, research has progressed on them as a new parameter of light. The lab seeks to make use of the potential of optical vortices from the perspectives of nonlinear optics and ultrashort pulses.
*Illustrative imageAmplification of Ultrashort Optical Vortex Pulses
An ultrashort pulse is laser light like a flash that shines for only a very short time. The lab built an optical system that produces ultrashort optical vortex pulses lasting only a few femtoseconds, and succeeded in amplifying them for the first time in the world.
*Illustrative imageOrbital Angular Momentum-Resolved Measurement of Broadband Optical Vortices
For laser light with a wide wavelength range, the orbital angular momentum could previously be examined only for the portion of wavelengths cut out with a filter. The lab is developing a technique that uses a diffraction grating to determine the distribution of orbital angular momentum at each wavelength for broadband optical vortices.
*Illustrative imageExtended Stokes Parameters and Extended Degree of Polarization
"Polarization vortices," typified by radial and azimuthal polarization, could previously be examined only qualitatively. The lab newly defined extended Stokes parameters and an extended degree of polarization, which express the state and quality of a polarization vortex numerically, making it possible to compare the quality of lasers and conversion elements.
*Illustrative imagePrecision Length Measurement with an Optical Clock Laser
The meter, the unit of length, is defined based on the time light takes to travel. This research repeatedly generates laser pulses whose width matches the time to be measured and counts them, determining very short times with high precision in order to read small differences and changes in length.
MembersFaculty
The members of the Optical Quantum Physics Lab consist of faculty, doctoral students, master's students, and undergraduates.As of 2024
- ProfessorRyuji Morita
- Associate ProfessorKeisaku Yamane
- Assistant ProfessorSeiichi Kakuma
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: “532nm” Netweb01 / CC BY-SA 3.0 (cropped)
- Amplification of Ultrashort Optical Vortex Pulses: “ChirpedPulseAmplificatiopnAction” Шмелёв Артемий Геннадьевич / CC BY-SA 3.0 (cropped)
- Orbital Angular Momentum-Resolved Measurement of Broadband Optical Vortices: “"Lines made with light" - diffraction gratings at the UK ATC ( )” Science and Technology Facilities Council / CC BY-SA 2.0 (cropped)
- Extended Stokes Parameters and Extended Degree of Polarization: “Birefringence of stress areas on a DVD jewel case” Mk2010 / CC BY-SA 3.0 (cropped)
- Precision Length Measurement with an Optical Clock Laser: “Newton rings” Ulfbastel / Public domain (cropped)
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- Related lab (Condensed Matter Physics Engineering Lab): “CdTe quantum dots” Ruslan.Ka / CC BY 4.0 (cropped)
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