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首页> 外文会议>High and low concentrator systems for solar electric applications VIII >Grating-Over-Lens Concentrating Photovoltaic Spectrum Splitting Systems with Volume Holographic Optical Elements
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Grating-Over-Lens Concentrating Photovoltaic Spectrum Splitting Systems with Volume Holographic Optical Elements

机译：带有体积全息光学元件的透镜光栅聚光光伏光谱分离系统

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摘要

In grating-over-lens spectrum splitting designs, a planar transmission grating is placed at the entrance of a plano-convex lens. Part of the incident solar spectrum is diffracted at 15-30° from normal incidence to the lens. The diffracted spectral range comes to a focus at an off-axis point and the undiffracted spectrum comes to a focus on the optical axis of the lens. Since the diffracted wave is planar and off-axis, the off-axis focal points suffer from aberrations that increase system loss. Field curvature, chromatic and spherical aberrations are compensated using defocusing and a curved focal plane (approximated with each photovoltaic receiver). Coma is corrected by modifying the off-axis wavefront used in constructing the hologram. In this paper, we analyze the use of non-planar transmission gratings recorded using a conjugate object beam to modify the off-axis wavefront. Diverging sources are used as conjugate object and reference beams. The spherical waves are incident at the lens and the grating is recorded at the entrance aperture of the solar concentrator. The on-axis source is adjusted to produce an on-axis planar wavefront at the hologram plane. The off-axis source is approximated to a diffraction limited spot producing a non-planar off-axis wavefront on the hologram plane. Illumination with a planar AM1 .5 spectrum reproduces an off-axis diffraction-limited spot on the focal plane. This paper presents ray trace and coupled wave theory simulations used to quantify the reduction in losses achieved with aberration correction.
机译：在透镜对透镜的光谱分裂设计中，将平面透射光栅放置在平凸透镜的入口处。入射太阳光谱的一部分从法线入射到透镜的衍射角为15-30°。衍射光谱范围聚焦在离轴点，未衍射光谱聚焦在透镜的光轴上。由于衍射波是平面且离轴的，因此离轴焦点的像差会增加系统损耗。场曲，色差和球差使用散焦和弯曲的焦平面（与每个光电接收器近似）进行补偿。通过修改构造全息图时使用的离轴波前，可以校正昏迷。在本文中，我们分析了使用共轭物镜记录的非平面透射光栅来修改离轴波前的情况。发散源用作共轭物体和参考光束。球面波入射到透镜上，光栅记录在太阳能集中器的入射孔处。调整轴上源以在全息图平面处产生轴上平面波前。离轴源近似于衍射极限点，在全息图平面上产生非平面的离轴波前。平面AM1.5光谱的照明在焦平面上产生离轴衍射限制的光斑。本文介绍了光线跟踪和耦合波理论仿真，用于量化像差校正所实现的损耗减少。

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