1998 Fiscal Year Final Research Report Summary
WHITE-LIGHT PHOTON RECYCLING LOOP INTERFEROMETER
| Project/Area Number |
09650051
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied optics/Quantum optical engineering
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| Research Institution | OSAKA UNIVERSITY |
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Principal Investigator |
KITAGAWA Masahiro GRADUATE SCHOOL OF ENGINEERING SCIENCE, OSAKA UNIVERSITY, ASSOCIATE PROFESSOR, 大学院・基礎工学研究科, 助教授 (20252629)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHARA Junichi GRADUATE SCHOOL OF ENGINEERING SCIENCE, OSAKA UNIVERSITY, RESEARCH ASSOCIATE, 大学院・基礎工学研究科, 助手 (90273606)
KOBAYASHI Tetsuro GRADUATE SCHOOL OF ENGINEERING SCIENCE, OSAKA UNIVERSITY, PROFESSOR, 大学院・基礎工学研究科, 教授 (10029522)
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| Project Period (FY) |
1997 – 1998
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| Keywords | interferometer / loop / gyroscope / fiber gyro / recycling / white-light / gravity wave / multimode |
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| Research Abstract |
A. White-light photon recycling loop interferometer with Ti : Sapphire laser
・ One of the end mirrors of Ti : Sapphire laser is replaced with a loop interferometer with 3.6 m loop length. Dark fringe is clearly observed even under the threshold, which suggests the broadband nature of the loop interferometer. The multimode oscillation with 1 nm (FWHM) total spectral width and 45.5 MHz mode separation is observed above the threshold.
・ The phase sensitivity measured by intra-loop phase modulator is very close to the shot noise limit due to the leakage light. To achieve the true standard quantum limit governed by the intra-cavity photon number, the leakage photon must be eliminated by improving the alignment of the loop.
B. White-light photon recycling fiber gyro with EDFA
・ Erbium-doped fiber is terminated by a loop interferometer consisting of 500 m polarization maintaining fiber (PANDA) and pumped with 980 nm laser diode. The fundamental characteristics of the very long cavity laser is investigated.
・ The phase sensitivity measured by intra-loop phase modulator is improved by 26 times by white-light photon recycling.
・ The rotation sensitivity actually measured is limited by the intensity fluctuations of the laser and is far from the true quantum limit enabled by white-light photon recycling. To achieve the true quantum limit, the intensity noise of the laser must be suppressed.
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