Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2007-07-25
Class.Quant.Grav.25:015008,2008
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
17 pages, 5 figures. Submitted to: Phys. Rev. D 15
Scientific paper
10.1088/0264-9381/25/1/015008
We previously showed how the measurements of some eighteen time series of relative frequency or phase shifts could be combined (1) to cancel the phase noise of the lasers, (2) to cancel the Doppler fluctuations due to non-inertial motions of the six optical benches, and (3) to remove the phase noise of the onboard reference oscillators required to track the photodetector fringes, all the while preserving signals from passinggravitational waves. Here we analyze the effect of the additional noise due to the optical modulators used for removing the phase fluctuations of the onboard reference oscillators. We use a recently measured noise spectrum of an individual modulator to quantify the contribution of modulator noise to the first and second-generation Time-Delay Interferometric (TDI) combinations as a function of the modulation frequency. We show that modulator noise can be made smaller than the expected proof-mass acceleration and optical-path noises if the modulation frequencies are larger than $\approx 682$ MHz in the case of the unequal-arm Michelson TDI combination $X_1$, $\approx 1.08$ GHz for the Sagnac TDI combination $\alpha_1$, and $\approx 706$ MHz for the symmetrical Sagnac TDI combination $\zeta_1$. These modulation frequencies are substantially smaller than previously estimated and may lead to less stringent requirements on the LISA's oscillator noise calibration subsystem.
Armstrong John W.
Estabrook Frank B.
Tinto Massimo
No associations
LandOfFree
Modulator noise suppression in the LISA Time-Delay Interferometric combinations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Modulator noise suppression in the LISA Time-Delay Interferometric combinations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modulator noise suppression in the LISA Time-Delay Interferometric combinations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-40366