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Photo-thermal Shot Noise in End Mirrors of LIGO due to Correlation of Power Fluctuation |
| WU Shi-Chen1;WAN Zhen-Zhu1,2;LI Huan¹;LIU Zhong-Zhu1 |
| ¹Department of Physics, Huazhong University of Science and Technology, Wuhan 430074
²Department of Physics, School of Mathematics and Physics, China University of Geosciences, Wuhan 430074
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| Cite this article: |
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WU Shi-Chen, WAN Zhen-Zhu, LI Huan&sup et al 2006 Chin. Phys. Lett. 23 3173-3175 |
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Abstract The effect of input power fluctuation on photo-thermal shot noise in the end mirrors of a laser interferometer gravitational-wave observatory (LIGO) is analysed according to the statistical optics, which is a supplement of Braginsky's research. The laser light folding in LIGO increases a correlation of input power fluctuation in the photo-thermal shot noise. This part of noise has spectral density proportional to ω-2 in low frequency bands, and ω-4 in high frequency bands. It is not a white noise and may affect the processing about data of interferometers. To obtain an advanced LIGO, photo-thermal shot noise in end mirrors due to correlation of input power fluctuation is up to Braginsky's photo-thermal noise in the frequency range 1--100 Hz.
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| Keywords:
04. 80. Nn
04. 80. Cc
95. 55. Ym
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Published: 01 December 2006
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