Title Sensor noise in LISA Pathfinder: Laser frequency noise and its coupling to the optical test mass readout
Authors Armano M. , Audley H. , Baird J. , Binetruy P. , Born M. , Bortoluzzi D. , Brandt N. , Castelli E. , Cavalleri A. , Cesarini A. , Cruise A.M. , Danzmann K. , De Deus Silva M. , Diepholz I. , Dixon G. , Dolesi R. , Ferraioli L. , Ferroni V. , Fitzsimons E.D. , Flatscher R. , Freschi M. , García A. , Gerndt R. , Gesa L. , Giardini D. , Gibert F. , Giusteri R. , Grimani C. , Grzymisch J. , Guzman F. , Harrison I. , Hartig M.-S. , Hechenblaikner G. , Heinzel G. , Hewitson M. , Hollington D. , Hoyland D. , Hueller M. , Inchauspé H. , Jennrich O. , Jetzer P. , Johann U. , Johlander B. , Karnesis N. , Kaune B. , Killow C.J. , Korsakova N. , Lobo J.A. , López-Zaragoza J.P. , Maarschalkerweerd R. , Mance D. , Martín V. , Martin-Polo L. , Martin-Porqueras F. , Martino J. , McNamara P.W. , Mendes J. , Mendes L. , Meshksar N. , Monsky A. , Nofrarias M. , Paczkowski S. , Perreur-Lloyd M. , Petiteau A. , Plagnol E. , Ramos-Castro J. , Reiche J. , RIVAS GARCÍA, FRANCISCO, Robertson D.I. , Russano G. , Sanjuan J. , Slutsky J. , Sopuerta C.F. , Steier F. , Sumner T. , Texier D. , Thorpe J.I. , Vetrugno D. , Vitale S. , Wand V. , Wanner G. , Ward H. , Wass P.J. , Weber W.J. , Wissel L. , Wittchen A. , Zweifel P.
External publication No
Means Physical Review D
Scope Article
Nature Científica
JCR Quartile 1
SJR Quartile 1
Publication date 01/01/2024
ISI 001184938500004
DOI 10.1103/PhysRevD.109.042003
Abstract The LISA Pathfinder (LPF) mission successfully demonstrated the feasibility of the technology needed for the future space borne gravitational wave observatory LISA. A key subsystem under study was the laser interferometer, which measured the changes in relative distance in between two test masses (TMs). It achieved a sensitivity of 32.0-1.7+2.4 fm/Hz, which was significantly better than the prelaunch tests. This improved performance allowed direct observation of the influence of laser frequency noise in the readout. The differences in optical path lengths between the measurement and reference beams in the individual interferometers of our setup determined the level of this undesired readout noise. Here, we discuss the dedicated experiments performed on LPF to measure these differences with high precision. We reached differences in path length difference between (368±5) µm and (329.6±0.9) µm which are significantly below the required level of 1 mm or 1000 µm. These results are an important contribution to our understanding of the overall sensor performance. Moreover, we observed varying levels of laser frequency noise over the course of the mission. We provide evidence that these do not originate from the laser frequency stabilization scheme which worked as expected. Therefore, this frequency stabilization would be applicable to other missions with similar laser frequency stability requirements. © 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article\'s title, journal citation, and DOI. Open access publication funded by the Max Planck Society.
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