A method to eliminate the matching problem and improve the spectral property of Talbot spectrometer. (January 2022)

• Record Type: Journal Article
• Authors: Li, Yixuan; Huang, Yu; Li, Haochen; Yang, Xiaohu; Li, Zhanfeng; Zhang, Zihui; Wang, Shurong
• Is Part Of: Optics and lasers in engineering. Volume 148(2022)
• Publication Date: 2022-01
• Subjects: Talbot spectrometer -- Mask of detector -- Cover the (phase-inverted) self-imaging -- Eliminate the matching problem; Lasers in engineering -- Periodicals; Optical measurements -- Periodicals; Optics -- Periodicals; Lasers en ingénierie -- Périodiques; Mesures optiques -- Périodiques; Optique -- Périodiques; 621.36605
• DOI: 10.1016/j.optlaseng.2021.106755
• Languages: English
• ISSNs: 0143-8166

Abstract

Highlights: Proposed a method by mask detector to eliminate the matching problem between grating and detector in the design of Talbot spectrometer, hence, the bottleneck of the spectrum performance of the current Talbot spectrometer is broken through. Making the design of Talbot spectrometer with both high-density gratings and large pixel imager is possible, which can be improved the spectral resolution greatly. The high spectral resolution can be received under the best interference fringe contrast of Talbot pattern. The formular of maximum pixel pitch is proposed, which can be used to design a Talbot spectrometer with detector mask. Abstract: At present, the mutual restriction between the spectral resolution and the dynamic range limits the further improvement of the spectral property of Talbot spectrometer. This mutual restriction is caused by the matching problem of grating and detector. Here, a method, which focuses on eliminating the relationship between grating and detector in the design of Talbot spectrometer, for masking detector to cover the (phase-inverted) self-imaging is introduced. Both theoretical simulation and experimental analysis validate the method, which maintains the contrast of pattern while changing the size of pixels and thus the matching problem no longer exists. Overall, this method breaking the bottleneck of spectral property for current talbot spectrometers, which makes the system design more flexible and enhances the universality of Talbot spectrometer, and the spectral resolution of the spectrometer under this method can be superior to 0.3nm while keeping the contrast of pattern, better than the previously reported best spectral resolution 1nm of current talbot spectrometer.