Effect of sample position on collinear femtosecond double-pulse laser-induced breakdown spectroscopy of silicon in air

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机构：
[1] Qi, Hongxia
[2] Li, Suyu
[3] Qi, Ying
[4] 1,Chen, Anmin
[5] Hu, Zhan
[6] Huang, Xuri
[7] 1,Jin, Mingxing
[8] Ding, Dajun
来源：
Chen, A. (amchen@jlu.edu.cn) | 1600年 / Royal Society of Chemistry卷 / 29期
关键词：
A femtosecond double-pulse laser was used to induce the plasma of silicon in air. The laser wavelength was 800 nm. The interpulse delay of the femtosecond double-pulse was from -20 ps to 100 ps. During the experiment; the spectral line was fixed at the wavelength of 288.157 nm. The emission intensity was observed to lead to a significant increase by choosing the proper sample position. The range of the sample position is from 5.17 mm to 5.27 mm. And; the best sample position for the higher laser fluence was different from the position for the lower laser fluence. At the higher laser fluence; the optimized emission intensity can be obtained at either side of the best focal position for all interpulse delays of the double-pulse. The phenomena can be explained by the nonlinear propagation of the femtosecond laser pulse in air. At the lower laser fluence; the best sample position will change from one side to both sides with the increase of the interpulse delay of the double-pulse. The results showed that the effect of the sample position can be especially advantageous in the context of femtosecond double-pulse laser-induced breakdown spectroscopy. The study will lead a further improvement in the applications of the femtosecond double-pulse laser. This journal is © the Partner Organisations 2014;
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