2017 Fiscal Year Final Research Report
high-speed spectrometer by using a large optical dispersion
| Project/Area Number |
16K13858
|
|---|
| Research Category |
Grant-in-Aid for Challenging Exploratory Research
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Atomic/Molecular/Quantum electronics
|
|---|
| Research Institution | Meiji University |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2016-04-01 – 2018-03-31
|
| Keywords | レーザー物理 / 超短パルスレーザー / 超高速分光 |
|---|
| Outline of Final Research Achievements |
We investigated the possibility of high-speed spectroscopy of ultrashort optical pulses by using large optical dispersion. An optical pulse becomes elongated with temporally varying frequency by passing through a dispersive material. Therefore, one can obtain the spectrum of the pulse in the form of its temporal waveform. In this study, we developed a high-speed spectrometer based on this principle. We examined the dependence on the fiber length of the pulse length and the rate of frequency variation. We evaluated the frequency resolution of this scheme experimentally as well as numerically by assuming second-order dispersion and Gaussian-shape pulses. We also verified that the spectroscopic technique works for interference spectra using a single-mode optical fiber.
Additionally, we attempted to apply the scheme for Raman spectroscopy of molecular vibrations and found that higher sensitivity is required for nonlinear spectroscopy.
|
| Free Research Field |
レーザー物理学
|
