Abstract Although double-pulse laser-induced breakdown spectroscopy (DP-LIBS) is regarded as a promising technique in trace element analysis, its limit of detection (LOD) is not sufficient for some applications. The enhancement of spectral signal is the key to further improve the sensitivity of DP-LIBS. To further increase the sensitivity of DP-LIBS, a concentric multipass cell (CMC) enhanced DP-LIBS (CMC-DP-LIBS) technique is proposed for the first time, which makes full use of the energy of reheating laser by multi-reflection in CMC to enhance the spectral signal and lower LOD. 2.3 times signal enhancement of Mn I 403.08 nm line and 2.3 times decrease of LOD of Mn on the surface of zinc bulk compared with traditional orthogonal reheating DP-LIBS were attained. The signal enhancement factor can reach to 3.6 theoretically with the increase of reflectivity and the sizes of mirrors of CMC. This CMC-DP-LIBS provides a new approach to further improve the sensitivity of DP-LIBS and promotes its application in trace element detection.

中文翻译：

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用于敏感元素分析的同心多通道池增强双脉冲激光诱导击穿光谱

摘要 虽然双脉冲激光诱导击穿光谱（DP-LIBS）被认为是微量元素分析中一种很有前途的技术，但其检测限（LOD）对于某些应用来说还不够。光谱信号的增强是进一步提高DP-LIBS灵敏度的关键。为了进一步提高DP-LIBS的灵敏度，首次提出了一种同心多通池（CMC）增强型DP-LIBS（CMC-DP-LIBS）技术，该技术通过多次反射充分利用了再加热激光的能量。在 CMC 中以增强光谱信号并降低 LOD。与传统的正交再加热 DP-LIBS 相比，Mn I 403.08 nm 线信号增强 2.3 倍，锌块体表面 Mn 的 LOD 降低 2.3 倍。信号增强因子可达3。6 理论上随着反射率的增加和 CMC 的反射镜尺寸的增加。这种CMC-DP-LIBS为进一步提高DP-LIBS的灵敏度提供了一种新方法，并促进了其在微量元素检测中的应用。