Summary of Research Project Results under JSPS FY2001
"Research for the Future Program"

1.Research Institution The University of Tokyo
2.Research Area Physical and Engineering Sciences
3.Research Field Photoscience
4.Term of Project FY 1997 〜 FY 2001
5.Project Number 97P00101
6.Title of Project Materials for Ultrafast Opto-optical Control

7.Project Leader
Name Institution,Department Title of Position
Takayoshi, Kobayashi The University of Tokyo, Graduate School of Science Professor

8.Core Members

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.

10.Key Words

(1)Optical Prametric Amplifier、(2)Ultrashort optical pulse、(3)quasi-dimensional material
(4)Organic Semiconductor、(5)Carrier-Envelop Phase、(6)real-time spectroscopy
(7)molecular vibration