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圖7.真實的全息記錄（左上），用于補償彗差并將接收器（能隙）定位在平坦表面上的共軛結構（左下）。
近軸焦點處的參考點光源由透鏡轉換成平面波前。相反，物點光源被透鏡轉換成有像差的準平面波前。通過在透鏡的平面上記錄具有準平面波前的光柵來校正該效應。
通過在平坦表面上使用期望的點源對象光束，來調整接收器的位置，如圖7的左下幾何結構所示。
圖8.在左邊，采用真實結構（平面光柵）記錄的光柵重建，分別對應于（a）單色光（633nm的HeNe）和（b）白光（氙弧太陽模擬器）。在右側，采用共軛結構（補償光柵）記錄的光柵重建，分別對應于（c）單色光和（d）白光。
圖8（a）和（c）的比較顯示出彗差的共軛結構補償，將光引向更緊密的焦點。對于單色和白光重建可以看到類似的結果。
4. 結論
在本文中，討論了光譜分裂作為用于多結PV系統的串聯電池的替代。提出了頻譜轉換效率（SCE）、整體系統效率、濾波器加權重疊（O）和對最佳能隙（IoBB）的改進，并將其定義為光譜分裂系統的評估度量。描述了全息光柵-透鏡幾何結構，并已經給出模擬和實驗結果。對于在可見光范圍（<0.9μm）中具有更多能隙的系統，IoBB顯示較大值。
光柵-透鏡幾何結構的離軸衍射角導致彗差和顯著的系統損耗。提出并演示了使用共軛記錄幾何來補償這種損耗的方法。
正在進行的工作包括使用系統度量結合已建立的用于全息光學元件中的最小化像差技術來增加總體光電轉換效率。
5. 致謝
作者想要感謝NSF / DOE ERC合作協議號EEC-1041895、NSF批準號0925085、亞利桑那州TRIF（WEES）項目和研究公司的支持。
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文章來源：Grating-Over-Lens Concentrating Photovoltaic Spectrum SplittingSystems with Volume Holographic Optical Elements
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