| Budget Amount *help |
¥43,160,000 (Direct Cost: ¥33,200,000、Indirect Cost: ¥9,960,000)
Fiscal Year 2016: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2015: ¥11,830,000 (Direct Cost: ¥9,100,000、Indirect Cost: ¥2,730,000)
Fiscal Year 2014: ¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2013: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
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| Outline of Final Research Achievements |
High-sensitivity displacement sensor had been developed to beat Standard Quantum Limit (SQL) using a technique of Displacement-noise Free Interferometer (DFI). In order to access to the SQL, high-displacement sensitivity is required in low frequency band, so it is essentially important to surpress disturbance remarkable in low-frequency band, like seismic noise. As one of solutions, employing the monolithic interferometer that fix the optics rigidly on the single base plate for a interferometer with optical fiber for laser light delivery, the sensitivity of the interferometer was limited by the shot noise (quantum noise) down to several Hz. Moreover, an active isolation system was developed as a way to surpress the seismic noise itself. Seismic isolation ratio of 2-3 orders of magnitude was realized in lo-frequency region, which corresponds to the seismic noise level of most quiet region on the earth.
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