We propose a unique way to design multipass cells (MPCs), which combines cost-efficient spherical mirrors with the high-density pattern of astigmatic mirrors. Such functionality was accomplished using at least three standard spherical mirrors appropriately tilted, which breaks the parallelism between them. A genetic algorithm (GA) supported the cell configuration optimization. A 16 m and 23.8 m optical path length (OPL) MPC was developed, practically realized, and proved by a time-of-flight (TOF) experiment to demonstrate the principle. Finally, CO₂ detection at 2004nm obtaining 0.4 ppmv limit of detection (LOD) using wavelength modulation spectroscopy (WMS) with 10 s averaging was performed.

中文翻译：

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由遗传算法辅助的紧凑、基于球面镜的密集散光样图案多通道单元设计

我们提出了一种设计多通道单元 (MPC) 的独特方法，它将具有成本效益的球面镜与散光镜的高密度图案相结合。这种功能是通过使用至少三个适当倾斜的标准球面镜来实现的，这打破了它们之间的平行性。遗传算法（GA）支持小区配置优化。开发了 16 m 和 23.8 m 光程长度 (OPL) MPC，并实际实现并通过飞行时间 (TOF) 实验证明了其原理。最后，使用波长调制光谱 (WMS) 在 2004nm 处进行CO ₂检测，获得 0.4 ppmv 的检测限 (LOD)，平均为 10 秒。