An extended light source based on multimode fiber in interferometers

Xu Zhang; Qi Lu; Weichao Gong; Shijie Liu

doi:10.1117/12.2688917

27 November 2023 An extended light source based on multimode fiber in interferometers

Xu Zhang, Qi Lu, Weichao Gong, Shijie Liu

Proceedings Volume 12769, Optical Metrology and Inspection for Industrial Applications X; 127691G (2023) https://doi.org/10.1117/12.2688917
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Conference Poster

Abstract

In interferometers, defects on the surface of optical elements can generate coherent noise, such as “Newton’s rings,” in interferograms, thereby affecting measurement accuracy. To address this issue, this paper proposes a method for extending the light source using a multimode fiber. By adjusting the parallel beam coupling into the multimode fiber, the coherent noise of the light source can be eliminated. The proposed method is verified in a Twyman-Green interferometer with a 25.4 mm diameter, employing a multimode fiber with a core diameter of 1 mm. Experimental results demonstrate a 36.9% reduction in scattering contrast and a 43% improvement in signal-to-noise ratio (SNR) of the interferometer when the fiber is moved ±1 mm perpendicular to the optical axis, while maintaining a fixed incidence angle of 1° to the optical axis. These findings confirm the effectiveness of the proposed method.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Xu Zhang, Qi Lu, Weichao Gong, and Shijie Liu "An extended light source based on multimode fiber in interferometers", Proc. SPIE 12769, Optical Metrology and Inspection for Industrial Applications X, 127691G (27 November 2023); https://doi.org/10.1117/12.2688917

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