The quest for improving the limits of trace elemental detection and reproducibility in Laser-Induced Breakdown Spectroscopy (LIBS) resulted in the development of novel methodologies for sample excitation and plasma collection. Efficient plasma collection and coupling to the detector is of utmost importance in LIBS studies for meaningful and logical data interpretations. Unfortunately, limited attention is paid to such critical aspects in comparison with the plethora of publications in advanced data analysis. In view of this, we probe the role of the different optical schemes on the collected plasma signal strength from three standard samples (Cu, Cd, Pb) while retaining all other experimental conditions such as laser energy, detector gain, gate width, and gate delay same. In addition, the role of coupling modalities on the plasma signal strength, an area not studied in depth, is investigated and found that the direct coupling scheme always provides better signal strength and repeatability. Moreover, the role of spectrographs in the measured signal strength is also investigated in detail for all the said standard samples. A comparative study elucidates that single shot experiments with low excitation pulse energies of the order of a few mJ are sufficient as compared to multi-short pulse laser excitation to provide the required limit of detection of the samples of interest which in turn makes the technique practically non-destructive. The efficacy of the optimized system was manifested by investigating idealistic and real-life samples viz. standard meals and teeth to differentiate between the normal and carious states. Our results reveal that the developed strategies may be useful in designing a robust system for fast ultra-trace elemental detection.

寻求提高激光诱导击穿光谱 (LIBS) 中痕量元素检测和重现性的限制导致开发了用于样品激发和血浆收集的新方法。在 LIBS 研究中，有效的血浆收集和与检测器的耦合对于有意义和合乎逻辑的数据解释至关重要。不幸的是，与高级数据分析中的大量出版物相比，对这些关键方面的关注有限。鉴于此，我们探讨了不同光学方案对从三个标准样品（Cu、Cd、Pb）收集的等离子体信号强度的作用，同时保留了所有其他实验条件，如激光能量、探测器增益、门宽和门延迟一样。此外，耦合方式对等离子体信号强度的作用，对一个没有深入研究的领域进行了调查，发现直接耦合方案总是提供更好的信号强度和可重复性。此外，还详细研究了所有所述标准样品的光谱仪在测量信号强度中的作用。一项比较研究表明，与多短脉冲激光激发相比，具有几 mJ 数量级的低激发脉冲能量的单次激发实验足以提供所需样品的检测极限，这反过来又使该技术具有实用性非破坏性。优化系统的功效通过调查理想化和现实生活中的样本来体现。标准膳食和牙齿，以区分正常和龋齿状态。