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Keywords = talbot wavemeter

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13 pages, 4221 KiB  
Article
A Method to Address the Impact of Incident Conditions on the Spectral Reconstruction of the Talbot Wavemeter
by Yiming Wang, Yu Huang, Xiaohu Yang, Zhanfeng Li and Yue Li
Sensors 2025, 25(5), 1609; https://doi.org/10.3390/s25051609 - 6 Mar 2025
Viewed by 640
Abstract
The Talbot wavemeter has attracted widespread attention from researchers in recent years due to its advantages of miniaturization and low cost. However, the impact of varying incident conditions caused by factors such as alignment has remained a challenge for spectral retrieval. This paper [...] Read more.
The Talbot wavemeter has attracted widespread attention from researchers in recent years due to its advantages of miniaturization and low cost. However, the impact of varying incident conditions caused by factors such as alignment has remained a challenge for spectral retrieval. This paper first derives the influence of different incident conditions on the interference pattern based on Fresnel diffraction and verifies the derivation through simulations. We propose a method to address the impact of incident conditions on the interference pattern. By adding a grating with a different periodicity in front of the detector, Moiré fringes are generated in the periodicity dimension, increasing the fringe period and thus enlarging the tolerance for angular misalignment. Finally, we constructed a Talbot wavemeter based on a double-grating structure, achieving a spectral resolution of 9 nm at 360 nm. This method provides a reference for the future development of a high-precision, high-resolution Talbot wavemeter. Full article
(This article belongs to the Section Optical Sensors)
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