Details
| Original language | English |
|---|---|
| Pages (from-to) | 5022-5029 |
| Number of pages | 8 |
| Journal | Physical Review A |
| Volume | 43 |
| Issue number | 9 |
| Publication status | Published - 1 May 1991 |
| Externally published | Yes |
Abstract
We treat the shot noise of a light source modulated in power as a nonstationary random process. The spectrum of such modulated shot noise, although it is still white, is shown to contain correlations between different frequency components. In addition, the noise is not equally distributed in phase. These effects can deteriorate the shot-noise-limited sensitivity of modulated interferometers. Maximizing the signal-to-noise ratio (SNR) introduces constraints on both the modulation and demodulation waveforms. The sensitivities obtained with several commonly used modulation schemes are calculated, and new modulation strategies are proposed to realize good SNR. We apply the results to the case of laser interferometer gravitational wave detectors where it is essential to reach a shot-noise-limited sensitivity. By taking into account the additional noise contribution from the modulated shot noise, we reduce the 3-dB discrepancy between the measured sensitivity of the Garching prototype detector and the theoretical shot-noise limit to about 1.5 dB.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
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In: Physical Review A, Vol. 43, No. 9, 01.05.1991, p. 5022-5029.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Nonstationary shot noise and its effect on the sensitivity of interferometers
AU - Niebauer, T. M.
AU - Schilling, R.
AU - Danzmann, K.
AU - R̈diger, A.
AU - Winkler, W.
PY - 1991/5/1
Y1 - 1991/5/1
N2 - We treat the shot noise of a light source modulated in power as a nonstationary random process. The spectrum of such modulated shot noise, although it is still white, is shown to contain correlations between different frequency components. In addition, the noise is not equally distributed in phase. These effects can deteriorate the shot-noise-limited sensitivity of modulated interferometers. Maximizing the signal-to-noise ratio (SNR) introduces constraints on both the modulation and demodulation waveforms. The sensitivities obtained with several commonly used modulation schemes are calculated, and new modulation strategies are proposed to realize good SNR. We apply the results to the case of laser interferometer gravitational wave detectors where it is essential to reach a shot-noise-limited sensitivity. By taking into account the additional noise contribution from the modulated shot noise, we reduce the 3-dB discrepancy between the measured sensitivity of the Garching prototype detector and the theoretical shot-noise limit to about 1.5 dB.
AB - We treat the shot noise of a light source modulated in power as a nonstationary random process. The spectrum of such modulated shot noise, although it is still white, is shown to contain correlations between different frequency components. In addition, the noise is not equally distributed in phase. These effects can deteriorate the shot-noise-limited sensitivity of modulated interferometers. Maximizing the signal-to-noise ratio (SNR) introduces constraints on both the modulation and demodulation waveforms. The sensitivities obtained with several commonly used modulation schemes are calculated, and new modulation strategies are proposed to realize good SNR. We apply the results to the case of laser interferometer gravitational wave detectors where it is essential to reach a shot-noise-limited sensitivity. By taking into account the additional noise contribution from the modulated shot noise, we reduce the 3-dB discrepancy between the measured sensitivity of the Garching prototype detector and the theoretical shot-noise limit to about 1.5 dB.
UR - http://www.scopus.com/inward/record.url?scp=0000105847&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.43.5022
DO - 10.1103/PhysRevA.43.5022
M3 - Article
AN - SCOPUS:0000105847
VL - 43
SP - 5022
EP - 5029
JO - Physical Review A
JF - Physical Review A
SN - 1050-2947
IS - 9
ER -