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Substrate material selection method for multilayer diffractive optics in a wide environmental temperature range.

Mingxu Piao, Qingfeng Cui, Chunzhu Zhao

    Applied Optics
    |April 5, 2017
    PubMed
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    We developed a method to select substrate materials for multilayer diffractive optical elements (MLDOEs) to maintain high polychromatic integral diffraction efficiency (PIDE) across temperatures. IRG26 and zinc sulfide are optimal for double-layer infrared DOEs.

    Area of Science:

    • Optical Engineering
    • Materials Science
    • Diffractive Optics

    Background:

    • Multilayer diffractive optical elements (MLDOEs) are crucial for optical systems.
    • Maintaining high polychromatic integral diffraction efficiency (PIDE) across varying environmental temperatures is a significant challenge.

    Purpose of the Study:

    • To present a substrate material selection method for MLDOEs.
    • To achieve high PIDE over a wide environmental temperature range.

    Main Methods:

    • Extended expressions for MLDOE surface relief heights were deduced, incorporating environmental temperature effects.
    • Introduced PIDE difference (Δη¯(λ)) and PIDE change factor (F) as metrics for material selection.
    • Analyzed double-layer and three-layer DOEs with various material combinations.

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    Main Results:

    • A smaller Δη¯(λ) or F value indicates better substrate material performance for maintaining PIDE.
    • IRG26 and zinc sulfide were identified as the optimal substrate combination for double-layer DOEs in the infrared waveband.
    • Polycarbonate is a more suitable middle filling material than polymethyl methacrylate for three-layer DOEs with identical substrates.

    Conclusions:

    • The proposed method effectively guides substrate material selection for temperature-stable MLDOEs.
    • Specific material combinations (IRG26/zinc sulfide, polycarbonate) are recommended for enhanced performance in infrared applications.