A new approach combining Raman spectrometry and laser induced breakdown spectrometry (LIBS) within a single laser event was suggested. A pulsed solid state Nd:YAG laser running in double pulse mode (two frequency-doubled sequential nanosecond laser pulses with dozens microseconds delay) was used to combine two spectrometry methods within a single instrument (Raman/LIBS spectrometer). First, a low-energy laser pulse (power density far below ablation threshold) was used for Raman measurements while a second powerful laser pulse created the plasma suitable for LIBS analysis. A short time delay between two successive pulses allows measuring LIBS and Raman spectra at different moments but within a single laser flash-lamp pumping. Principal advantages of the developed instrument include high quality Raman/LIBS spectra acquisition (due to optimal gating for Raman/LIBS independently) and absence of target thermal alteration during Raman measurements. A series of high quality Raman and LIBS spectra were acquired for inorganic salts (gypsum, anhydrite) as well as for pharmaceutical samples (acetylsalicylic acid). To the best of our knowledge, the quantitative analysis feasibility by combined Raman/LIBS instrument was demonstrated for the first time by calibration curves construction for acetylsalicylic acid (Raman) and copper (LIBS) in gypsum matrix. Combining ablation pulses and Raman measurements (LIBS/Raman measurements) within a single instrument makes it an efficient tool for identification of samples hidden by non-transparent covering or performing depth profiling analysis including remote sensing.

中文翻译：

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通过双脉冲激光将拉曼光谱和激光诱导击穿光谱结合起来

提出了在一次激光事件中结合拉曼光谱法和激光诱导击穿光谱法（LIBS）的新方法。在双脉冲模式下运行的脉冲固态Nd：YAG激光器（两个频率加倍的连续纳秒激光脉冲，延迟数十微秒）用于在单个仪器（拉曼/ LIBS光谱仪）中结合两种光谱法。首先，将低能量激光脉冲（功率密度远低于消融阈值）用于拉曼测量，而第二个强激光脉冲产生适合LIBS分析的等离子体。两个连续脉冲之间的短时间延迟允许在不同时刻但在单个激光闪光灯泵浦中测量LIBS和拉曼光谱。开发的仪器的主要优点包括高质量的拉曼/ LIBS光谱采集（由于独立进行拉曼/ LIBS的最佳门控）和在拉曼测量过程中没有目标热变化。对于无机盐（石膏，无水石膏）以及药物样品（乙酰水杨酸），获得了一系列高质量的拉曼光谱和LIBS光谱。据我们所知，通过石膏基质中乙酰基水杨酸（Raman）和铜（LIBS）的校准曲线构建，首次证明了结合拉曼/ LIBS仪器进行定量分析的可行性。