High-repetition rate acousto-optic gated SAF-LIBS for quantitative analysis

Abstract

The self-absorption-free LIBS (SAF-LIBS) we developed recently was demonstrated to be effective in reducing the effects of self-absorption, but it is difficult to be applied to industrial production because of the need for expensive, large size and fragile components such as ICCD and echelle spectrometer. In this study, a novel quantitative analysis technology named as high repetition rate acousto-optic gated SAF-LIBS is proposed, in which AOM acts as the optical gating switch and high-repetition rate laser as the excitation source, so that the miniaturized CCD spectrometer can be used in the SAF-LIBS. Univariate quantitative analysis results show that the linear correlation coefficient of the calibration curve of aluminum is 0.98, and the average absolute error is 0.15%, indicating that the measurement accuracy is almost the same as traditional SAF-LIBS. This work will greatly reduce the cost and size of the system and improve the practicability of SAF-LIBS.