| Project/Area Number |
11640374
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
物性一般(含基礎論)
|
|---|
| Research Institution | Osaka University |
|---|
Principal Investigator |
KAREMATSU Yasao Osaka University, Faculty of Engineering, Assosiate Professor, 工学研究科, 助教授 (00211855)
|
|---|
| Project Period (FY) |
1999 – 2000
|
| Project Status |
Completed (Fiscal Year 2000)
|
| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2000: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1999: ¥1,900,000 (Direct Cost: ¥1,900,000)
|
|---|
| Keywords | Optical Kerr effect / Ultra fast spectroscopy / laser / Fluorescence |
|---|
| Research Abstract |
We have developed an ultrafast time-resolved fluorescence measurement system, utilizing the ultrafast electronic response of the optical Kerr effect in solid. An amplified titanium-sapphire laser system with the pulse width of 150 fs and the repitation rate of 200 kHz and a CCD-attached polychromator are used as excitation and gating light source and as a detection system, respectively. The main part of the system is consist of an excitation source of the SH-light generator, a sample in a flow cell, parabolic mirrors as a collimator and a condenser of the fluorescence, a Kerr gate (polarizer, Kerr material, analyze) and an optical delay line. We have examined various choices for the individual optical elements and the optical arrangements in order to obtain high signal to noise ratio, less wavelength-dependent time-delay dispersion and high time-resolution so that we have obtained a guideline for the better system. We have demonstrated that this system enables us in the direct and efficient manner to measure the time-resolved spectral shape of the fluorescence of dye solutions such as the S_2→S_0 fluorescence of Zn-tetraphenylporohyrin in ethanol. A total set of the data has been obtained in one-order shorter time than the conventional method. Direct recognition of the dynamic Stokes shift has been achieved in the measurement for several dye solutions. We have also conducted the measurements for photoactive yellow protein and found the anomalous behavior of spectral narrowing in the ps-time region, the origin of which is now under investigation. It can be said that the results of this study shows the usefulness of the developed system as a standard measurement system for the next generation.
|
