Distortion measurement of optical system using phase diffractive beam splitter

Wang, Feng; Zhang, Zhe; Wang, Ruoqiu; Zeng, Xuefeng; Yang, Xu; Lv, Shiliang; Zhang, Feng; Deng, Xue; Yan, Jiwang; Zhang, Xuejun

doi:10.1364/oe.27.029803

Cited by 13 publications

(4 citation statements)

References 18 publications

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“…In practical applications [30][31][32][33][34][35][36], some operating changes are inevitable. Therefore, it is necessary to analyze the performance with different incident wavelengths.…”

Section: Analysis and Discussionmentioning

confidence: 99%

Bullet-alike arrays for TE-one/TM-two splitting under second Bragg incidence at communication laser wavelength

Fu¹,

Wang²

2020

Laser Phys.

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A polarization-selective bullet-alike reflective grating is described in this paper. Based on the finite element method, the parameters are continuously optimized to obtain the nice structure. During the simulation, within the incident wavelength of 1528–1563 nm or the incident angle range of 49.9–51.4°, the -2nd order of TE-polarized light achieves more than 95% efficient reflection, and the 0th and -2nd order of TM-polarized light achieves more than 40% efficient reflection for two ports. The results show the good process tolerance and incident characteristics of the grating. In addition, the normalized electric field distribution of bullet-alike reflective gratings is analyzed, which explains the complex physical mechanism well. The polarization-selective bullet-alike reflective grating can be well applied in the laser field.

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“…In practical applications [30][31][32][33][34][35][36], some operating changes are inevitable. Therefore, it is necessary to analyze the performance with different incident wavelengths.…”

Section: Analysis and Discussionmentioning

confidence: 99%

Bullet-alike arrays for TE-one/TM-two splitting under second Bragg incidence at communication laser wavelength

Fu¹,

Wang²

2020

Laser Phys.

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“…Finally, the proposed method solves the warping problem of the 2D pixel coordinates x p (x s , y s ) of the document image by using the radial distortion algorithm in [44][45][46][47], which depends on low-order polynomials, as shown as follows:…”

Section: Warping Correctionmentioning

confidence: 99%

An Efficient Method for Document Correction Based on Checkerboard Calibration Pattern

et al. 2022

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Portable digital devices such as PDAs and camera phones are the easiest and most widely used methods to preserve and collect information. Capturing a document image using this method always has warping issues, especially when capturing pages from a book and rolled-up documents. In this article, we propose an effective method to correct the warping of the captured document image. The proposed method uses a checkerboard calibration pattern to calculate the world and image points. A radial distortion algorithm is used to handle the warping problem based on the computed image and world points. The proposed method obtained an error rate of 3% using a document de-warping dataset (CBDAR 2007). The proposed method achieved a high level of quality compared with other previous methods. Our method fixes the problem of warping in document images acquired with different levels of complexity, such as poor lighting, low quality, and different layouts.

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“…Diffractive optical elements (DOEs) are gaining attention due to their superior characteristics such as small size, light weight, high diffraction efficiency, and large-scope production capability [1,2]. The rapid development of lithography has made the fabrication of subwavelength DOEs increasingly economical, thereby enabling their use in various applications, such as beam shaping [3,4], beam splitting [5,6], structured light [7,8], and optical system distortion measurement [9]. Conventional DOE typically rely on etching different heights on the substrate to achieve phase control.…”

Section: Introductionmentioning

confidence: 99%

An improved Fourier modal method for design of metasurface diffractive optical elements

Dai,

Zhang,

et al. 2024

J. Opt.

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An improved Fourier modal method (FMM) is developed for the design of metasurface diffractive optical elements (DOEs), which combines the iterative Fourier transform algorithm (IFTA) with FMM. In which, the IFTA is executed for a coarse solution; then, FMM is for a precise solution. We take a 5 × 5 metasurface DOE with nanorods as an example to explore the improved FMM (IFTA + FMM). By varying the diameter of the nanorods on the metasurface DOE, a 5 × 5 spot array DOE has been created with a diffraction angle of 48°× 48° in the far field. The analysis results show that the improved FMM (IFTA + FMM) requires fewer iterations, about 17 times, while direct FMM requires about 70 times. The DOE designed with an improved FMM achieves a diffraction efficiency of 79.6% with a uniformity of 24.2%, while the DOE designed with a direct FMM shows a diffraction efficiency of 76.9% with a uniformity of 27.7%. The improved FMM (IFTA + FMM) shows a similar accuracy, but is more timesaving, simple, and intuitive.

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Distortion measurement of optical system using phase diffractive beam splitter

Cited by 13 publications

References 18 publications

Bullet-alike arrays for TE-one/TM-two splitting under second Bragg incidence at communication laser wavelength

Bullet-alike arrays for TE-one/TM-two splitting under second Bragg incidence at communication laser wavelength

An Efficient Method for Document Correction Based on Checkerboard Calibration Pattern

An improved Fourier modal method for design of metasurface diffractive optical elements

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