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Long-term stable optical cavity for Special Relativity tests in space

Sanjuan, Josep and Abich, Klaus and Gohlke, Martin and Resch, Andreas and Schuldt, Thilo and Wegehaupt, Timm and Barwood, Geoffrey P. and Gill, Patrick and Braxmaier, Claus (2019) Long-term stable optical cavity for Special Relativity tests in space. Optics Express, 27 (25), pp. 36206-36220. Optical Society of America. DOI: 10.1364/OE.27.036206 ISSN 1094-4087

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Official URL: https://www.osapublishing.org/oe/abstract.cfm?uri=oe-27-25-36206


BOOST (BOOst Symmetry Test) is a proposed space mission to search for Lorentz invariance violations and aims to improve the Kennedy-Thorndike parameter constraint by two orders of magnitude. The mission consists of comparing two optical frequency references of different nature, an optical cavity and a hyperfine transition in molecular iodine, in a low Earth orbit. Naturally, the stability of the frequency references at the orbit period of 5400 s (f =0.18 mHz) is essential for the mission success. Here we present our experimental efforts to achieve the required fractional frequency stability of 7.4x10^(-14) Hz^(-1/2) at 0.18 mHz (in units of the square root of the power spectral density), using a high-finesse optical cavity. We have demonstrated a frequency stability of (9 +/- 3)x10^(-14) Hz^(-1/2) at 0.18 mHz, which corresponds to an Allan deviation of 10^(-14) at 5400 s. A thorough noise source breakdown is presented, which allows us to identify the critical aspects to consider for a future space-qualified optical cavity for BOOST. The major noise contributor at sub-milli-Hertz frequency was related to intensity fluctuations, followed by thermal noise and beam pointing. Other noise sources had a negligible effect on the frequency stability, including temperature fluctuations, which were strongly attenuated by a five-layer thermal shield.

Item URL in elib:https://elib.dlr.de/130311/
Document Type:Article
Title:Long-term stable optical cavity for Special Relativity tests in space
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Abich, KlausKlaus.Abich (at) dlr.deUNSPECIFIED
Gohlke, MartinMartin.Gohlke (at) dlr.deUNSPECIFIED
Resch, AndreasAndreas.Resch (at) dlr.deUNSPECIFIED
Schuldt, Thilothilo.schuldt (at) dlr.deUNSPECIFIED
Wegehaupt, TimmTimm.Wegehaupt (at) dlr.deUNSPECIFIED
Barwood, Geoffrey P.National Physical LaboratoryUNSPECIFIED
Gill, PatrickNational Physical LaboratoryUNSPECIFIED
Braxmaier, Clausclaus.braxmaier (at) dlr.deUNSPECIFIED
Journal or Publication Title:Optics Express
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
DOI :10.1364/OE.27.036206
Page Range:pp. 36206-36220
Publisher:Optical Society of America
Keywords:cavity optical resonator frequency stabilization
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Systems Engineering Optische Systeme
Location: Bremen
Institutes and Institutions:Institute of Space Systems > Systems Enabling Technologies
Deposited By: Hamann, Ines
Deposited On:14 Nov 2019 09:03
Last Modified:13 Jan 2020 10:05

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