ISSP - The institute for Solid State Physics

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Kobayashi Group
Associate Professor
KOBAYASHI,
Yohei

Research Associate
TANI,
Shuntaro

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We are developing advanced laser technologies and their applications. Both ultimate technologies of ultrashort pulse generations and ultra narrow-band laser generations were mixed, the optical frequency comb then was born. It opened up a new research area such as carrier-envelope-phase dependent phenomena, attosecond physics, and precision spectroscopy by using a femtosecond light source. It also realized the high-repetition and high-intensity physics. It could create wide field of applications in the physics, metrology, medical science, and astronomy. We are developing an Yb-fiber laser-base optical frequency comb, XUV frequency comb, and high-power fiber chirped pulse amplifier system for these applications. The high-repetition-rate laser system will be applied for a calibration of a spectrograph in an observatory or an arbitrary waveform generation in an optical field, or a breath diagnosis. In addition, we are studying the fundamental processes of laser processing and bridging the gap between them and industrial applications.

Optical frequency comb based ultra-high precision spectroscopy. The combination of ultra-high repetition-rate laser and ultra-high resolution spectrograph makes it possible to resolve each comb tooth to detect the meta-stable He atom.
Offset-free optical frequency comb.
Measurement of laser processing dynamics with sub-picosecond time resolution.

Research Subjects

  1. Development and precise control of ultrashort pulse laser system
  2. High-rep rate, high-field physics
  3. Precision spectroscopy
  4. Astronomical, medical, and metrological application of the optical frequency comb
  5. Fundamental understanding on laser processing