Initial structure of dispersion objective for chromatic confocal sensor based on doublet lens

Zhang, Zilong; Lu, Rongsheng

doi:10.1016/j.optlaseng.2020.106424

Cited by 25 publications

(6 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown by related studies, a DCL with a positive lens and a negative lens will effectively reduce the aberration of the system [18] and expand the collimated beam, while the working distance will have less influence on the coupling. The FC/APC interface was used to facilitate the connection of fibers and reduce losses, and the structure of the fiber coupler is shown in Figure 1.…”

Section: Structure Analysismentioning

confidence: 92%

Optical Coupling Efficiency of a Coupler with Double-Combined Collimating Lenses and Thermally Expanded Core Fibers

Zhao

Ye³

et al. 2022

Micromachines

View full text Add to dashboard Cite

Improving the coupling efficiency of two optical signals is a hot issue, where the efficiency of optical coupling has a significant effect on the signal transmission over the fiber link. To this end, the Large-Beam Fiber Coupler (LBFC) with a Double-combined Collimating Lens (DCL) and a single-mode TEC fiber structure are proposed in this study. Based on the propagation principle of Gaussian beams and the coupling requirements, the coupling mechanism of the fiber coupler and the coupling mismatch between the coupler is analytically modeled. The model and the optical path are optimized, then the ray tracing is used to calculate the coupling efficiency of inter-coupler signals for different SMF. The coupling efficiency is evaluated through experiments in terms of coupling efficiency and the radial, axial, and angular mismatches between the couplers. The results showed that with a large Mode Field Diameter (MFD), better coupling efficiency can be obtained, i.e., a large MFD of 28 μm is tested with its maximal efficiency of 95.16%. Moreover, the angular mismatch has the most significant impact on the coupling efficiency, while the axial mismatch has the least. The use of large MFD can alleviate the angular mismatch and thus improve the optical coupling efficiency.

show abstract

Section: Structure Analysismentioning

confidence: 92%

Optical Coupling Efficiency of a Coupler with Double-Combined Collimating Lenses and Thermally Expanded Core Fibers

Zhao

Ye³

et al. 2022

Micromachines

View full text Add to dashboard Cite

show abstract

“…In this study, the structure of a dispersion lens was designed based on the working principle of a spectral confocal system and the dispersion principle of the objective. The initial structure proposed by Zhang Zilong was selected as the dispersion focusing lens [10] and further optimized using Zemax software. Within the design wavelength range of 450nm to 720nm, ten evenly spaced wavelengths were chosen, and an optimization function was utilized to ensure equal distances between the focal points of adjacent wavelengths.…”

Section: Optimization Of Linear Dispersion Objectivementioning

confidence: 99%

Novel parallel measurement method of spectral confocal sensor with multi-point scanning

Xu,

Liu,

Han

et al. 2023

Optical Metrology and Inspection for Industrial Applications X

View full text Add to dashboard Cite

Spectral confocal technology has widespread applications in the field of surface topography measurement. However, conventional spectral confocal sensors are limited to acquiring height information for one point at a time during the measurement process. Consequently, the need for point-by-point scanning compromises the efficiency of existing methodologies. To address this challenge, we propose a novel measurement method utilizing a Nipkow disk and spectral imaging technology. This innovative approach enables simultaneous acquisition of height information for multiple points. In this paper, a dispersive objective lens is designed by using Zemax OpticStudio optical design software, specifically tailored for simultaneous multi-point measurements. The dispersive lens group consists of five single lenses and one double cemented lens, working within the wavelength range of 450nm to 720nm. The dispersion range can reach 450μm, with a dispersion linearity coefficient of 0.998. The accuracy of the dispersive objective lens for multi-point measurement is validated through non-sequential mode simulations in Zemax OpticStudio. The results demonstrate a measurement linearity of 0.998 for each individual measurement point. This simulation experiment provides theoretical foundations and guidance for subsequent experimental endeavors.

show abstract

“…By inserting the Formula ( 16) to (9) and Formula ( 17) to (10), the focal lengths of the lenses (i=1;2 at the different wavelengths f iF , f iC can be computed using only the Abbe number V i and the central focal length f i .…”

Section: Paraxial Consideration Of the Equivalent Abbe Number For The...mentioning

confidence: 99%

“…Purely refractive systems have been neglected, and the influence of lens materials on axial color distribution has not been addressed. Zhang et al [10] presented various doublets that are suitable for the creation of hyperchromatic systems. The doublets discussed are only used in combination with other optical elements and the systems are not optimized for imaging spot quality.…”

Section: Introductionmentioning

confidence: 99%

Extreme Refractive-, Diffractive- and Hybrid-Hyperchromats: Minimizing the Equivalent Abbe Number of a Two-Lens System

et al. 2023

View full text Add to dashboard Cite

This work provides a comprehensive analysis of the maximum chromatic axial split of two-element hyperchromats, with the distance between the two lenses being a key variable. Purely refractive and diffractive systems are considered, as well as hybrid layoutscombining refractive and diffractive elements. In order to achieve extreme chromatic axial splitting and accordingly a minimum equivalent Abbe number for lens combinations, a three-step procedure was used. In the first paraxial step, purely optical quantities such as focal lengths of the lenses, inter-lens distances and dispersion properties of the lenses were investigated. In the second step, which also takes place in the paraxial domain, additional geometric boundary conditions such as the radii, diameters and thicknesses of the lenses are taken into account. The results of this step serve as an input for the final optimization using optical design software, which derives practical solutions for minimum equivalent Abbe numbers with diffraction-limited image quality. As a significant result, the comparison with directly cemented lens doublets shows that the introduction of a distance between the elements allows for a much stronger chromatic decomposition for refractive, diffractive and also hybrid combinations. Quantitatively, the minimum equivalent Abbe number for refractive systems is reduced from 2.5 (without spacing) to 1.79 (with spacing). For hybrid combinations, a corresponding reduction from 0.4 to 0.29 is achieved.

show abstract

Initial structure of dispersion objective for chromatic confocal sensor based on doublet lens

Cited by 25 publications

References 8 publications

Optical Coupling Efficiency of a Coupler with Double-Combined Collimating Lenses and Thermally Expanded Core Fibers

Optical Coupling Efficiency of a Coupler with Double-Combined Collimating Lenses and Thermally Expanded Core Fibers

Novel parallel measurement method of spectral confocal sensor with multi-point scanning

Extreme Refractive-, Diffractive- and Hybrid-Hyperchromats: Minimizing the Equivalent Abbe Number of a Two-Lens System

Contact Info

Product

Resources

About