| Project/Area Number |
13640398
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
物理学一般
|
|---|
| Research Institution | The University of Electro-Communications |
|---|
Principal Investigator |
KATSURAGAWA Masayuki The University of Electro-Communications, Faculty of Electro-Communicaitons, Associate Professor, 電気通信学部, 助教授 (10251711)
|
|---|
| Project Period (FY) |
2001 – 2002
|
| Project Status |
Completed (Fiscal Year 2002)
|
| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2002: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2001: ¥2,200,000 (Direct Cost: ¥2,200,000)
|
|---|
| Keywords | Vacuum ultraviolet / Stimulated Raman Scattering / Tunable laser / Solid hydrogen / Frequency conversion / Single frequency / coherence / 国体水素 / 真空紫外レーザー / ビート |
|---|
| Research Abstract |
The purpose of the present project is to realize useful coherent radiations in vacuum ultraviolet (vuv) region using solid hydrogen as a nonlinear optical material. We have tried to efficiently modulate single-frequency tunable laser radiations around 200 nm with extremely high Raman-coherence in solid hydrogen and generate single-frequency tunable laser radiations in vuv region. In the following, we summarize our principal results.
1, We have generated 201nm laser radiation by taking sum-frequency of 266nm- (forth harmonics of YAG laser) and 827nm- (Ti : sapphire laser) laser radiations with energy conversion efficiency of 〜10%. The pulse duration of the generated 201 nm laser radiation was 10 ns with the Fourier transform limited linewidth of 〜 30 MHz.
2, We have modulated the single-frequency tunable laser radiations at 201 nm by the Raman-coherence with the frequency of 125 THz that was adiabatically driven in solid hydrogen, leading vuv coherent radiation at 186 nm with quantum efficiency of 〜 8%.
3, We have demonstrated laser spectroscopy in vuv region for a transition in Schumann-Runge band (B ^3Σ_<-u> (v'=8, N'=20) ←X ^3Σ_<-g> (v"=0, N"=19), wavelength : 185.987nm) by using the coherent vuv radiation realized above. We have shown that the laser spectroscopy with spectral resolution of 〜 50 MHz is possible in vuv, leading the precise spectral profile and cross section of this transition.
|
