Journal Article

PUBDB-2024-06397

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Applying Differential Wave-Front Sensing and Differential Power Sensing for Simultaneous Precise and Wide-Range Test-Mass Rotation Measurements

Meshksar, N. (Corresponding author) ; Mehmet, M. (Corresponding author) ; Isleif, K.-S.DESY* ; Heinzel, G.

2021
MDPI Basel

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Please use a persistent id in citations: doi:10.3390/s21010164  doi:10.3204/PUBDB-2024-06397

Abstract: We propose to combine differential wave-front sensing (DWS) and differential power sensing (DPS) in a Mach-Zehnder type interferometer for measuring the rotational dynamics of a test-mass. Using the DWS method, a high sensitive measurement of 6 nrad Hz(-1/2) in sub-Hz frequencies can be provided around the test-mass nominal position (+/- 0.11 mrad), whereas the measurement of a wide rotation range (+/- 5 mrad) is realized by the DPS method. The interferometer can be combined with deep frequency modulation (DFM) interferometry for measurement of the test-mass translational dynamics. The setup and the resulting interferometric signals are verified by simulations. An optimization algorithm is applied to find suitable positions of the lenses and the waist size of the input laser in order to determine the best trade of between the slope of DWS, dynamic range of DPS, and the interferometric contrast. Our simulation further allows to investigate the layout for robustness and design tolerances. We compare our device with a recent experimental realization of a DFM interferometer and find that a practical implementation of the interferometer proposed here has the potential to provide translational and rotational test-mass tracking with state-of-the-art sensitivity. The simple and compact design, and especially the capability of sensing the test-mass rotation in a wide range and simultaneously providing a high-precision measurement close to the test-mass nominal position makes the design especially suitable for example for employment in torsion pendulum setups.

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Contributing Institute(s):

1. Strahlkontrollen (MSK)

Research Program(s):

1. 621 - Accelerator Research and Development (POF4-621) (POF4-621)
2. DFG project G:(GEPRIS)390837967 - EXC 2123: QuantumFrontiers - Licht und Materie an der Quantengrenze (390837967) (390837967)

Experiment(s):

1. No specific instrument

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