Thermal detuning of a bichromatic narrow linewidth optical cavity

authored by: L. D. Bonavena, M. Lequime, M. Vardaro, Y. Zhao, M. Barsuglia, M. Bawaj, A. Bertolini, R. Bonnand, E. Capocasa, M. De Laurentis, J. Ding, S. Di Pace, R. Flaminio, B. Garaventa, A. Grimaldi, Y. Guo, P.-E. Jacquet, A. Masserot, M. Mehmet, R. Passaquieti, L. Pinard, E. Polini, V. Sequino, F. Sorrentino, M. Tacca, H. Vahlbruch, J. P. Zendri
Abstract: In the Advanced Virgo+ interferometric gravitational-wave detector, the length control of the Fabry-Pérot cavities in the arms and of the detuned filter cavity, used for generating frequency-dependent squeezing, uses an auxiliary green beam at half of the operation laser wavelength (1064 nm). While operating the filter cavity with such a bichromatic control scheme for tens of hours, we observed that the mirror reflection phase shift of the fields at the two wavelengths responds differently to temperature changes in the mirrors, causing a change in the relative resonance condition of the two beams. In this paper we show that this thermal detuning effect can be explained by considering the thermomechanical properties of the mirror coating. Our experimental measurements are in good agreement with the theoretical predictions and allow us to drive requirements on the bicolor coating design and mirror temperature stability for long-term stable cavity control.
Organisation(s): QuantumFrontiers
Institute of Gravitation Physics
External Organisation(s): University of Padova
Astronomical Observatory of Padua
UMR CNRS 8009
Maastricht University
National Institute for Subatomic Physics (Nikhef)
University of Perugia
Universita degli Studi di Napoli Parthenope
Istituto Nazionale di Fisica Nucleare (INFN)
University Rome III
University of Montreal
University of Genova
University of Trento
Sorbonne Université
Type: Article
Journal: Phys. Rev. A
Volume: 109
Pages: 043709
No. of pages: 1
ISSN: 2469-9926
Publication date: 01.04.2024
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Atomic and Molecular Physics, and Optics
Electronic version(s): https://hal.science/hal-04543330 (Access: Open)
https://doi.org/10.1103/PhysRevA.109.043709 (Access: Closed)

BibTeX

@article{07ace422ac9c4a489479b48e05868a06,
title = "Thermal detuning of a bichromatic narrow linewidth optical cavity",
abstract = "In the Advanced Virgo+ interferometric gravitational-wave detector, the length control of the Fabry-P{\'e}rot cavities in the arms and of the detuned filter cavity, used for generating frequency-dependent squeezing, uses an auxiliary green beam at half of the operation laser wavelength (1064 nm). While operating the filter cavity with such a bichromatic control scheme for tens of hours, we observed that the mirror reflection phase shift of the fields at the two wavelengths responds differently to temperature changes in the mirrors, causing a change in the relative resonance condition of the two beams. In this paper we show that this thermal detuning effect can be explained by considering the thermomechanical properties of the mirror coating. Our experimental measurements are in good agreement with the theoretical predictions and allow us to drive requirements on the bicolor coating design and mirror temperature stability for long-term stable cavity control.",
author = "Bonavena, {L. D.} and M. Lequime and M. Vardaro and Y. Zhao and M. Barsuglia and M. Bawaj and A. Bertolini and R. Bonnand and E. Capocasa and {De Laurentis}, M. and J. Ding and {Di Pace}, S. and R. Flaminio and B. Garaventa and A. Grimaldi and Y. Guo and P.-E. Jacquet and A. Masserot and M. Mehmet and R. Passaquieti and L. Pinard and E. Polini and V. Sequino and F. Sorrentino and M. Tacca and H. Vahlbruch and Zendri, {J. P.}",
year = "2024",
month = apr,
day = "1",
doi = "10.1103/PhysRevA.109.043709",
language = "English",
volume = "109",
pages = "043709",
journal = "Phys. Rev. A",
issn = "2469-9926",
publisher = "American Physical Society",
number = "4",
}