High diffraction efficiency of three-layer diffractive optics designed for wide temperature range and large incident angle

Shan, Mingguang; Cui, Qiu; Piao, Mingxu; Zhao, Lidong

doi:10.1364/ao.55.003549

Cited by 20 publications

(6 citation statements)

References 20 publications

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“…Therefore, it is necessary to design DOE for thermal aberration elimination in infrared refractive diffractive hybrid optical systems. DOE and refractive optical elements have different temperature characteristics, and the change in focal length is only determined by the material's expansion coefficient, and is not related to the change in refractive index caused by temperature changes [52]. In order to reduce the limitations of environmental temperature on DOE applications, the design goal is to achieve polychromatic integrated diffraction efficiency [53], which can improve the imaging quality of the imaging system.…”

Section: Infrared Imaging Systemmentioning

confidence: 99%

Design and application of diffractive optical element: a review

Xu,

Wang,

Wang

et al. 2024

Practical Holography XXXVIII: Displays, Materials, and Applications

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Diffractive optical element (DOE) has the characteristics of lightweight, flexibility, and easy replication, which meet the needs of miniaturization, integration, and mass production of optical systems. They play and will continue to play an important role in multiple fields of modern optics. In application scenarios with different requirements, researchers need to flexibly apply design methods to customize DOE with specific functions. On the basis of reviewing the basic principles of DOE design, existing DOE design methods based on diffraction principle and interference principle are briefly described. Combined with the latest application progress of DOE in the field of imaging and display, the applicability of DOE design methods is elaborated. Finally, the difficulties faced in DOE design are summarized, and potential application directions in future technology are prospected.

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Section: Infrared Imaging Systemmentioning

confidence: 99%

Design and application of diffractive optical element: a review

Xu,

Wang,

Wang

et al. 2024

Practical Holography XXXVIII: Displays, Materials, and Applications

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“…Virtual Conference 30 March-2 April 2021 extension of a diffractive lens and was already described in many papers. [12][13][14][15][16] This paper major results are the expression of the chromatic focal shift of MLDOEs and the study of their image quality.…”

Section: Icso 2020 International Conference On Space Opticsmentioning

confidence: 99%

Making compact and innovative dual-band thermal imagers using hybrid optical elements

Laborde

Loicq

Habraken

et al. 2021

International Conference on Space Optics — ICSO 2020

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Infrared (IR) remote sensing offers a huge range of applications, mostly addressing make-or-break issues of our century (crops water content monitoring, forest fires and volcanic eruption detection and imaging, etc.). These applications fall under different spectral bands, known as mid and long-wave infrared, which are very hard to combine in a single compact instrument. In this article we propose to explore the infrared (IR) behaviour of a dual-band diffractive component: the multilayer diffractive optical element (MLDOE). We use and discuss the thin element approximation as a valid phase model. Using Fourier optics, we are able to simulate the resulting image of the MLDOE. Thereby, ray-tracing software are not accurate to model a complex diffractive component. The Strehl ratio is used to determine the focalization efficiency for the working order, which is above 95% in the mid and long-wave infrared bands. This result, along with the very low energy content of the other orders, proves the strong imaging potential of MLDOEs for dual-band applications. It is also demonstrated that the MLDOE has the same chromatic behaviour as standard DOEs, making it a very useful component for infrared achromatization.

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“…In the frame of this analytical theory, the diffraction efficiency of MLDOEs reaches over 95% in the whole MWIR-LWIR bandwidth for on-axis incidence and any material combination [7,8]. On the other hand, off-axis incidence studies [9][10][11] have shown that an increase of the incident angle results in a loss of diffraction efficiency, which depends on the material combination. A widely used material selection method (MSM) [12] is based on the following observation: an "optimal" MLDOE design should undergo the smallest diffraction efficiency drop for the highest incidence angle.…”

Section: Introductionmentioning

confidence: 99%

Multilayer diffractive optical element material selection method based on transmission, total internal reflection, and thickness

Laborde¹,

Loicq²,

HASTANIN³

et al. 2022

Appl. Opt.

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The polychromatic integral diffraction efficiency (PIDE) metric is generally used to select the most suitable materials for multilayer diffractive optical elements (MLDOEs). However, this method is based on the thin element approximation, which yields inaccurate results in the case of thick diffractive elements such as MLDOEs. We propose a new material selection approach, to the best of our knowledge, based on three metrics: transmission, total internal reflection, and the optical component’s total thickness. This approach, called “geometric optics material selection method” (GO-MSM), is tested in mid-wave and long-wave infrared bands. Finite-difference time-domain is used to study the optical performance (Strehl ratio) of the “optimal” MLDOE combinations obtained with the PIDE metric and the GO-MSM. Only the proposed method can provide MLDOE designs that perform. This study also shows that an MLDOE gap filled with a low index material (air) strongly degrades the image quality.

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High diffraction efficiency of three-layer diffractive optics designed for wide temperature range and large incident angle

Cited by 20 publications

References 20 publications

Design and application of diffractive optical element: a review

Design and application of diffractive optical element: a review

Making compact and innovative dual-band thermal imagers using hybrid optical elements

Multilayer diffractive optical element material selection method based on transmission, total internal reflection, and thickness

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