092-802-6093

Studies on Electronic Exited State and Sensitive Detection of Nitrogen Dioxide by Means of Laser-Induced Time-Resolved Fluorescence Spectroscopy

No

Applied Analytical Chemistry

0000-0003-4152-3257

01years00months

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

B.Education
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

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