首页|Substrate material selection model for dual-band multilayer diffractive optical elements with wide angle of incidence
Substrate material selection model for dual-band multilayer diffractive optical elements with wide angle of incidence
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NSTL
Elsevier
Large angle of incidence and multi-band are the goals pursued by modern multilayer diffractive optical element (MLDOE). The polychromatic integral diffraction efficiency (PIDE) is sensitive to the incident angle and refractive index of the substrate material. Therefore, we propose a new solution for selecting a set of optimal substrate materials of MLDOE to obtain the maximum PIDE in a large angle incidence. A mathematical model is established and the substrate material selection method based on comprehensive PIDE difference comparison (SMS-CPDC) for dual-band MLDOE is proposed. The three-layer DOEs in visible-NIR dual-band and the double-layer DOEs in MWIR-LWIR dual-band are designed and discussed as the examples. In visible-NIR dual-band and MWIR-LWIR dual-band, the optimal substrate material combinations are N-PK52A-PC-P-SF69 and ZNSE-ZNS, respectively. When the comprehensive PIDE decreases to 90%, the available incident angle range is +/- 51.6 degrees for N-PK52A-PC-P-SF69 MLDOE and that is +/- 10.9 degrees for ZNSE-ZNS MLDOE; When the comprehensive PIDE decreases to 85%, the available incident angle range is +/- 54.2 degrees for N-PK52A-PC-P-SF69 MLDOE and that is is +/- 12.1 degrees for ZNSE-ZNS MLDOE. The results are of great significance for the application of MLDOEs in hybrid system with a large range of incident angle and multi operating band.
NSTL
Elsevier
