Recent research in augmented reality (AR) eyewear has prompted interest in using volume holographic optical elements for this application. However, many sensing operations in AR systems require the use of wavelengths in the near-infrared (NIR) (750 to 900 nm). These wavelengths typically exceed the sensitivity range of available commercial holographic recording materials (450 to 650 nm), which complicates the design of optical elements with power since significant aberrations result when the reconstruction wavelength differs from the construction wavelength. Several methodologies for designing a waveguide hologram imaging system in NIR are reviewed and evaluated. The design approach presented in our work integrates the most effective practices such as fabrication point source location optimization and aberration analysis to realize effective holographic waveguide couplers formed with visible wavelength light and reconstructed in the NIR. The technique is demonstrated by designing and fabricating an input waveguide hologram in conjunction with a multiplexed output coupling hologram. The resulting input/output waveguide holograms can achieve an image resolution of (∼3 lp / mm) with a 0.6-mm-thick glass substrate that has a refractive index of 1.8.

中文翻译：

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基于全息光学元件的近红外光波导眼动追踪系统的设计

最近对增强现实 (AR) 眼镜的研究激发了人们对此应用使用体积全息光学元件的兴趣。然而，AR 系统中的许多传感操作需要使用近红外 (NIR)（750 至 900 nm）波长。这些波长通常超过可用的商用全息记录材料的灵敏度范围（450 到 650 nm），这使得具有功率的光学元件的设计变得复杂，因为当重建波长与构造波长不同时会导致显着的像差。回顾和评估了在 NIR 中设计波导全息成像系统的几种方法。我们工作中提出的设计方法集成了最有效的实践，例如制造点光源位置优化和像差分析，以实现由可见波长光形成并在 NIR 中重建的有效全息波导耦合器。该技术通过设计和制造输入波导全息图与多路复用输出耦合全息图来演示。由此产生的输入/输出波导全息图可以实现（~3 lp / mm）的图像分辨率，0.6 mm厚的玻璃基板具有1.8的折射率。