Holography for automotive applications: from HUD to LIDAR

Holography for automotive applications: from HUD to LIDAR
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汽车应用的全息术:从 HUD 到 LIDAR

DOI:
10.1117/12.2323771
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发表时间:
2018
期刊:
Optical Data Storage 2018: Industrial Optical Devices and Systems;
影响因子:
--
通讯作者:
Takashima, Yuzuru
Takashima, Yuzuru
中科院分区:
--
文献类型:
--
作者:
Draper, Craig T.;McDonald, Joshua;Blanche, Pierre-Alexandre J.;Bigler, Colton M.;Sarma, Kalluri;Katayama, Ryuichi;Takashima, Yuzuru

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全息技术可以为汽车光学系统所面临的特定问题提供独特的解决方案。通常,当使用折射和折射设计的可能性已经用尽时,衍射可以通过打开一个新的维度来进行探索。例如,全息光学元件(HOE)是可以有利地代替透镜、棱镜或反射镜的薄膜光学器件。用于自动驾驶汽车的平视显示器(HUD)和激光雷达是我们团队使用HOE为经典光学限制提供原始答案的两个系统。使用HUD,HOE解决了投影系统中常见的有限视场和小眼箱的问题。我们的方法是在波导内多次回收光,这样组合器就可以和整个挡风玻璃一样大。在该系统中,全息图用于在波导的一端注入小图像,并且另一个全息图用于多次提取图像,从而提供扩展的眼箱。在LIDAR系统的情况下,基于衍射空间光调制器(SLM)的非机械光束扫描仅能够实现几度的角度范围。我们使用多路复用体全息图(VH)来放大来自SLM的初始衍射角,以在紧凑的外形中实现高达4π球面度的覆盖。
Holography can offer unique solutions to the specific problems faced by automotive optical systems. Frequently, when possibilities have been exhausted using refractive and refractive designs, diffraction can come to the rescue by opening a new dimension to explore. Holographic optical elements (HOEs), for example, are thin film optics that can advantageously replace lenses, prisms, or mirrors. Head up display (HUD) and LIDAR for autonomous vehicles are two of the systems where our group have used HOEs to provide original answers to the limitations of classical optic. With HUD, HOEs address the problems of the limited field of view, and small eye box usually found in projection systems. Our approach is to recycle the light multiple times inside a waveguide so the combiner can be as large as the entire windshield. In this system, a hologram is used to inject a small image at one end of a waveguide, and another hologram is used to extract the image several times, providing an expanded eye box. In the case of LIDAR systems, non-mechanical beam scanning based on diffractive spatial light modulator (SLM), are only able to achieve an angular range of few degrees. We used multiplexed volume holograms (VH) to amplify the initial diffraction angle from the SLM to achieve up to 4π steradian coverage in a compact form factor.
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