Kyushu University Academic Staff Educational and Research Activities Database
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IMASAKA Totaro Last modified date:2020.04.09

Professor Emeritus / Professor Emeritus

Graduate School
Undergraduate School

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URL of Imasaka Laboratory .
Academic Degree
Studies on Electronic Exited State and Sensitive Detection of Nitrogen Dioxide by Means of Laser-Induced Time-Resolved Fluorescence Spectroscopy
Country of degree conferring institution (Overseas)
Field of Specialization
Applied Analytical Chemistry
ORCID(Open Researcher and Contributor ID)
Total Priod of education and research career in the foreign country
Outline Activities
A. Research
1) Generation of Ultimately-Short Optical Pulse Using Two-Color Stimulated Raman Effect-Rainbow Stars-
2) Study on High-Intensity Multi-Color Laser Source and Its Application to Laser Display
3) Study on Non-Linear Optical Phenomenon
4) Laser-Induced Time-Resolved Fluorescence Spectroscopy
5) Thermal Lens Spectrometry
6) Semiconductor Laser Spectrometry
7) Supersonic Jet Spectrometry
8) Optical Chromatography
9) Diffractive Optical Chemical Sensor

Totaro Imasaka is teaching "Analytical Instrumentation" and "Small-Group Freshman's Course" and also supervising "Laboratory Course" and "Research Traning Course" in the undergraduate school. Imasaka is teaching "Analytical Instrumentation Using Lasers" and "Molecular Thermodynamics" and also supervising the students for their dissertation works in the graduate school.

C.Social Activities
In the above research areas, Imasaka is involved in collaborative works with several companies. Especially in dioxin analysis using supersonic jet spectrometry, Imasaka carried out the NEDO Consortium Project (300 million yen/three year) during 200-2002. Imasaka supervised many companies about this subject for practical applications. Imasaka is studying on a multi-color ultrashort laser, which is supported by a large grant provided from the JSPS. Imasaka expects that this technology and its product will be commercialized in the near future. These researach subjects are introduced in numerous mass communications such as newspapers and televisions. In 2000, Imasaka worked as one of the commettee members for evaluation of the education system in Kyushu Institute of Design. Imasaka served as a head of the Kyushu Branch of the Spectroscopical Society of Japan, and one of the commettee members for selecting several awards. Imasaka also served as a member of IUPAC and worked for standarizing technologies in science and as editorial advisory boards in many scientific journals. Imasaka is, at present, trying to construct a venture company in Kyusu University.
Research Interests
  • Study on Multi-Color Ultrashort Pulse Laser
    keyword : Laser, Display, Ultrashort Optical Pulse, Four-Wave Raman Mixing, Nonlinear Optics
    2000.01When a laser beam is focused into a Raman medium such as hydrogen, a colorful laser beam appears. This laser source can be utilized for multi-color laser display. By phase locking the emission lines, it is possible to generate an ultimately-short optical pulse. This laser source can be applied to the studies of ultrafast phenomena, femtosecond laser processing, and optical data communication..
  • Study on Supersonic Jet Spectrometry
    keyword : Laser, Multiphoton Ionization, Mass Spectrometry, Dioxins, Trace Analysis
    2000.01A sample molecule is expanded into a vaccum for molecular cooling to several degree of Kelvin. By taking the advantage of well-resolved spectral feature, the analyte molecule can be selectively measured based on this method. Multiphoton ionization followed by mass analysis is succussfully used for determination of the analyte molecule. This approach is developed for dioxin analysis, which is expected to be commercialized in the near future.
  • Trace Analysis of Biological Substances
    keyword : Laser, Electrophoresis, Fluorescence Spectrometry, Biology, Trace Analysis
    2000.01A sensitive laser-induced fluorometric technique has been developed for practical trace analysis using a semiconductor laser as an exciting source. By a combination with a separation technique such as capillary electrophoresis, a selective and sensitive analytical means has been developed and applied to trace analysis of amino acids, proteins, and DNAs. Recently, the sensitivity is further improved by the use of a mathematical technique based on Hadamard transformation..
Current and Past Project
  • We develop a mass spectrometer using a laser ionization source and use this technology for protection of environment in China.
  • We generate a three-primary-color laser and a train of optical pulses at an ultimately-high repetition rate using a two-color stimulated Raman effect.
  • We develop a mass spectrometer using a laser ionization source and measure dioxins present in the environment at ultratrace levels. We are scheduled to construct a venture company based on this technology.
  • We develop a new type of laser system that generates an ultrashort optical pulse based on the two-color stimulated Raman effect and apply it to analysis of trace chemical species.
  • Toxic dioxins are present in the environment. In this project, we develop a new analytical instrumentation for trace analysis of dioxins based on multiphoton ionization mass spectrometry.
  • We developed three elemental technologies for on-line real-time monitoring of dioxins: (1) an instrument for trapping, concentration, and pretreatment of dioxins emitted from an incinerator (2) a tunable picosecond laser for efficient ionization of dioxin molecules (3) a mass spectrometer for efficient beam focusing of ions induced by multiphoton ionization. We are, at present, developing a total analytical system for on-line real-time monitoring of dioxins by combining these three elemental technologies
  • A multifrequency laser will be generated by focusing a laser beam into a Raman medium such as molecular hydrogen. By phase locking the emission lines, an ultrashort optical pulse will be generated. A coloful laser beam can be used for a multi-color laser display. On the other hand, an ultrashort optical pulse can be used for various applications such as femtosecond laser processing and studies on ultrafast phenomena. A highly-repetitive ultrashort optical pulse (17 THz) will be generated and applied to ultrafast optical data communication.
Academic Activities
1. Siddihalu Lakshitha Madunil, Tomoko Imasaka, Totaro Imasaka, Resonant and Non-Resonant Femtosecond Ionization Mass Spectrometry of Organochlorine Pesticides, Analyst, 145, 777-783, 2020.02.
2. Vu Van Son, Hiroshi Nakamura, Tomoko Imasaka, Totaro Imasaka, Determination of Nerve Agent Metabolites in Human Urine by Femtosecond Laser Ionization Mass Spectrometry Using 2-(bromomethyl)naphthalene as a Derivatizing Reagent, Analytica Chimica Acta, 1069, 82-88, 2019.09.
3. Thang Dinh Phan, Duong Vu, Totaro Imasaka, Vacuum-Ultraviolet Stimulated Emission Generated via Four-Wave Raman Mixing in Molecular Hydrogen, Applied Physics B, 125, 7, 128, 2019.07.
4. Yuta Nakano, Anton D. Shutov, Totaro Imasaka, Alexei V. Sokolov, Generation of Ultrafast Optical Pulses via Molecular Modulation in Ambient Air, Applied Sciences, 9, 2509, 2019.06.
5. Yuanyuan Tang, Shigekazu Yamamoto, Adan Li, Totaro Imasaka, Determination of Nitrated Polycyclic Aromatic Hydrocarbons in Particulate Matter 2.5 by Laser Ionization Mass Spectrometry Using an On-Line Chemical-Reduction System, Analyst, 144, 2909-2913, 2019.05.
6. Vu Duong, Dinh Phan Thang, Totaro Imasaka, Ro-vibrational Revival of the Molecular Hydrogen Wave Packet by a Two-Color Pump in Four-Wave Raman Mixing, Optics and Laser Technology, 10.1016/j.optlastec.2017.12.016, 102, 22-24, 2018.06.
7. Yoshifumi Mori, Totaro Imasaka, Generation of Ultrashort Optical Pulses in the Deep-Ultraviolet Region Based on Four-Wave Raman Mixing, Applied Sciences, 8, 784, 2018.05.
8. Xixiang Yang, Tomoko Imasaka, Totaro Imasaka, Determination of Pesticides by Gas Chromatography Combined with Mass Spectrometry Using Femtosecond Lasers Emitting at 267, 400, and 800 nm as the Ionization Source, Analytical Chemistry, 90, 4886-4893, 2018.04.
9. Adan Li, Tomoko Imasaka, Totaro Imasaka, Optimal Laser Wavelength for Femtosecond Ionization of Polycyclic Aromatic Hydrocarbons and Their Nitrated Compounds in Mass Spectrometry, Analytical Chemistry, 10.1021/acs.analchem.8b00125, 90, 2963-2969, 2018.02.
Works, Software and Database
1. .
Other Educational Activities
  • 2012.11.
  • 2011.11.
  • 2010.11.
  • 2010.11.
  • 2009.11.
  • 2008.11.
  • 2007.11.
  • 2006.12.
  • 2004.07.
Professional and Outreach Activities
Totaro Imasaka carried out a collaborative works with several companies about the research work related to supersonic jet spectrometry. This work was introduced in several newspapers such as Nikkei Newspaper, and many peoples in more than 20 companies came to my laboratory and discussed about this work and future projects in our laboratory. His work was supported by the NEDO foundation for a consortium project in the title of "Development of analytical instrument for on-line real-time monitoring of dioxins", and 10 groups in institutes and companies joined to this collaborative work for future commercialization of the developed technology.
Imasaka performed a cooperative work with a company, which is financially supported by Kitakyushu City, for a development of a multi-color laser display. This project was also supported by the government. This technology is scheduled to be commercialized in the future.
Imasaka joined to a consortium project for the development of a plasma display panel, in which Imasaka developed an analytical instrument for the evaluation of inorganic fluorophores. For this purpose, Imasaka constructed a VUV fluorescence spectrometer combined with a VUV pulsed laser for the measurement of a transient luminescence process.
In other social activities, Imasaka developed an analytical instrument for capillary electrophoresis and also for optical chromatography..