Optical testbed for the LISA phasemeter

11th Edoardo Amaldi Conference on Gravitational Waves

Schwarze, T.S.^1 ; Fernández Barranco, G.^1 ; Penkert, D.^1 ; Gerberding, O.^1 ; Heinzel, G.^1 ; Danzmann, K.^1

Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), And Institut für Gravitationsphysik, Leibniz Universitat Hannover, Callinstrasse 38, Hannover

30167, Germany^1

关键词: Auxiliary functions;    Electronic readout;    Gravitational wave detectors;    Inter-satellite ranging;    Metrology systems;    Satellite geodesy;    Technical University of Denmark;    Technology development projects;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/716/1/012004/pdf
DOI  :  10.1088/1742-6596/716/1/012004

来源: IOP

【 摘 要 】

The planned spaceborne gravitational wave detector LISA will allow the detection of gravitational waves at frequencies between 0.1 mHz and 1 Hz. A breadboard model for the metrology system aka the phasemeter was developed in the scope of an ESA technology development project by a collaboration between the Albert Einstein Institute, the Technical University of Denmark and the Danish industry partner Axcon Aps. It in particular provides the electronic readout of the main interferometer phases besides auxiliary functions. These include clock noise transfer, ADC pilot tone correction, inter-satellite ranging and data transfer. Besides in LISA, the phasemeter can also be applied in future satellite geodesy missions. Here we show the planning and advances in the implementation of an optical testbed for the full metrology chain. It is based on an ultra-stable hexagonal optical bench. This bench allows the generation of three unequal heterodyne beatnotes with a zero phase combination, thus providing the possibility to probe the phase readout for non-linearities in an optical three signal test. Additionally, the utilization of three independent phasemeters will allow the testing of the auxiliary functions. Once working, components can individually be replaced with flight-qualified hardware in this setup.