2017 Fiscal Year Final Research Report
Exploring temporal variation of the fine structure constant using single-ytterbium-ion optical clocks
| Project/Area Number |
26287092
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Partial Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Atomic/Molecular/Quantum electronics
|
|---|
| Research Institution | Kyoto University |
|---|
Principal Investigator |
|
|---|
| Co-Investigator(Renkei-kenkyūsha) |
KITANO Masao 京都大学, 大学院工学研究科, 教授 (70115830)
|
|---|
| Project Period (FY) |
2014-04-01 – 2018-03-31
|
| Keywords | 量子エレクトロニクス / 物理定数 / イオントラップ / 周波数標準 / 光周波数コム / 光時計 |
|---|
| Outline of Final Research Achievements |
We explore a temporal variation of the fine structure constant by measuring frequency ratios between clock transitions in Yb+.
In addition to the 2S1/2－2D5/2 transition in 174Yb+, we developed single-ion spectroscopy of the 2S1/2－2D3/2 magnetic-insensitive transition in 171Yb+. We found that the many sidebands observed in the spectra were caused by nonlinear ion motion enlarged by a displacement of the ion from the trap center, and that they were reduced by eliminating excess micromotions. This leads to improvement of the uncertainties caused by ion motions in the clock transition frequencies.
We developed the phase locking of an optical frequency comb to a clock laser. We realized continuous optical frequency ratio measurement for three hours using a laser-diode pumped Yb:KYW laser.
|
| Free Research Field |
量子エレクトロニクス
|
