|1.Research Institution||The University of Tokyo|
|2.Research Area||Physical and Engineering Sciences|
|4.Term of Project||FY 1997 〜 FY 2001|
|6.Title of Project||Materials for Ultrafast Opto-optical Control|
|Name||Institution,Department||Title of Position|
|Takayoshi, Kobayashi||The University of Tokyo, Graduate School of Science||Professor|
|Names||Institution,Department||Title of Position|
|Hatchiro, Nakanishi||Tohoku University, Institute for Chemical Reaction Science||Professor|
|Hideki, Hashimoto||Shizuoka University, Faculty of Engineering||Associated Professor|
|Kazuhiko, Misawa||Tokyo University of Agriculture and Technology, Faculty of Technology||Associated Professor|
9.Summary of Research Results
In order to evaluate ultrafast nonlinear optical properties of materials for optolectronic devices, we
develop new methods for time-resolved nonlinear spectroscopy and measure time dependence of
optical nonlinearities. On the basis of these measurements we clarify mechanisms of nonlinearities,
and provide guiding principles for designing new optoelectronic devices.
1. Development of ultrashort pulse laser: We have succeeded in generating 3.9 fs optical pulses, the shortest optical pulses in the world, using a newly developed noncollinear optical parametric amplifier.
2. Quasi-one-dimensional materials: Using the shortest optical pulses, we have studied vibrational dynamics in various organic materials. Especially, many new information about the nonlinear properties has been obtained for one-dimensional organic materials including conjugated polymers and J-aggregates.
3. J-aggregates: Using a scanning near-field optical microscope developed in this project, mechanism of energy transfer between two-types of J-aggregates has been studied.
4. Infrared spectroscopy: Using femtosecond infrared pulse laser system developed in this project, vibrational dynamics in organic semiconductors has been studied.
5. New polydiacetlenes: We have succeeded in composition of new plolydiacetlenes, which have large nonlinear susceptibility.
6. Cavity QED: The cavity length dependence of spontaneous Raman scattering intensity of acetonytryl in mircocavity has been studied.
7. Carrier-Envelop Phase locked laser: Using noncollinear optical parametric amplifier, we have succeeded in controlling the carrier-envelope phase of ultrashort pulses. This can be very useful for ultrashort coherent X-ray pulse generation.
(1)Optical Prametric Amplifier、(2)Ultrashort optical pulse、(3)quasi-dimensional material
(4)Organic Semiconductor、(5)Carrier-Envelop Phase、(6)real-time spectroscopy