Working Paper Article Version 2 This version is not peer-reviewed

Ghost Beam Suppression in Deep Frequency Modulation Interferometry for Compact on-Axis Optical Heads

Version 1 : Received: 10 February 2021 / Approved: 12 February 2021 / Online: 12 February 2021 (13:54:12 CET)
Version 2 : Received: 4 March 2021 / Approved: 5 March 2021 / Online: 5 March 2021 (11:13:44 CET)

A peer-reviewed article of this Preprint also exists.

Gerberding, O.; Isleif, K.-S. Ghost Beam Suppression in Deep Frequency Modulation Interferometry for Compact On-Axis Optical Heads. Sensors 2021, 21, 1708. Gerberding, O.; Isleif, K.-S. Ghost Beam Suppression in Deep Frequency Modulation Interferometry for Compact On-Axis Optical Heads. Sensors 2021, 21, 1708.

Journal reference: Sensors 2021, 21, 1708
DOI: 10.3390/s21051708

Abstract

We present a compact optical head design for wide-range and low noise displacement sensing using deep frequency modulation interferometry. The on-axis beam topology is realised in a quasi-monolithic component and relies on cube beamsplitters and beam transmission through perpendicular surfaces to keep angular alignment constant when operating in air or vacuum, which leads to the generation of ghost beams that can limit the phase readout linearity. We investigate the coupling of these beams into the non-linear phase readout scheme of DFMI and demonstrate adjustments of the phase estimation algorithm to reduce this effect. This is done through a combination of balanced detection and the inherent orthogonality of beat signals with different relative time-delays in deep frequency modulation interferometry that is a unique feature not available for heterodyne, quadrature or homodyne interferometry.

Subject Areas

laser interferometry; displacement sensing; ghost beams

Comments (1)

Comment 1
Received: 5 March 2021
Commenter: Oliver Gerberding
Commenter's Conflict of Interests: Author
Comment: Submission of the final version after peer-review.
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