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  • Optica Publishing Group  (2)
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  • Optica Publishing Group  (2)
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  • 1
    Online Resource
    Online Resource
    Virtually imaged phased-array-based 2D nonmechanical beam-steering device for FMCW LiDAR
    Optica Publishing Group ; 2021
    In:  Applied Optics Vol. 60, No. 8 ( 2021-03-10), p. 2177-
    Details
    In: Applied Optics, Optica Publishing Group, Vol. 60, No. 8 ( 2021-03-10), p. 2177-
    Abstract: Nonmechanical beam-steering devices are of importance to achieve fast, compact, and reliable LiDAR. We propose a 2D nonmechanical beam-steering device based on a virtually imaged phased array (VIPA) for frequency-modulated continuous-wave (FMCW) LiDAR. In the design, 2D nonmechanical beam steering and high-resolution FMCW ranging can be achieved at the same time by wavelength tuning. The design formulas of the VIPA-based 2D disperser are greatly simplified by introducing appropriate approximation, and a feasible design procedure is proposed for the first time, to the best of our knowledge. Based on the proposed method, several design examples with different optimal properties are exhibited.
    Type of Medium: Online Resource
    ISSN: 1559-128X , 2155-3165
    URL: Article
    DOI: 10.1364/AO.414128
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
    detail.hit.zdb_id: 207387-0
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Extended ray-mapping method based on differentiable ray-tracing for non-paraxial and off-axis freeform illumination lens design
    Optica Publishing Group ; 2023
    In:  Optics Express Vol. 31, No. 19 ( 2023-09-11), p. 30066-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 31, No. 19 ( 2023-09-11), p. 30066-
    Abstract: The ray-mapping method has been widely used for designing freeform illumination lenses. However, in non-paraxial or off-axis situations, it remains challenging to obtain an integrable ray-mapping, often requiring a complex iterative correction process for the initial mapping. To address this challenge, we propose an extended ray-mapping method that incorporates differentiable ray-tracing into the design pipeline of the ray-mapping method. This enables accurate surface construction according to ray-mapping and efficient shape correction based on irradiance distribution. The proposed method involves two optimization stages. In the first stage, the freeform surface is preliminarily optimized to closely match the optimal transport mapping. The obtained freeform surface is then further optimized in the second stage to minimize the divergence between the target and simulated irradiance distributions. Additionally, the mean curvature of the freeform surface is also constrained in the second stage to facilitate the fabrication of the final freeform surface. Non-paraxial illumination lenses and off-axis illumination lenses have been designed using the proposed method within ten minutes, and simulations demonstrate that the approach is effective and robust.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.499001
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2023
    detail.hit.zdb_id: 1491859-6
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