| Budget Amount *help |
¥14,820,000 (Direct Cost: ¥11,400,000、Indirect Cost: ¥3,420,000)
Fiscal Year 2017: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2016: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2015: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2014: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
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| 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.
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