This article is cited in 14 papers

The influence of laser focusing on the intensity of spectral lines in femtosecond laser-induced breakdown spectroscopy of liquids

S. S. Golik^ab, A. A. Il'in^ab, A. V. Kolesnikov^ab, M. Yu. Babii^ab, Yu. N. Kulchin^ab, O. A. Bukin<sup>ab

a</sup> Institute for Automation and Control Processes, Far Eastern Branch of the Russian Academy of Sciences, Vladivostok
^b Far Eastern Federal University, Vladivostok

Abstract: The influence of the diameter of the beam of a femtosecond Ti:Sapphire laser (800 nm, 40 fs, 0.8 mJ) on the intensity of spectral lines upon optical breakdown on the surface of CaCl$_2$ aqueous solution has been determined experimentally. It is shown that an increase in the laser-beam diameter from 7 to 14 mm on a focusing lens for identical pulse energy increases the intensities of the CaII (393.3 nm) and H$_{\alpha}$ (656 nm) lines by factors of 3 and 20, respectively. This effect can be used to increase the intensities of emission lines of chemical elements in femtosecond laser-induced breakdown spectroscopy of liquids and, accordingly, improve the sensitivity of this method.

Received: 02.04.2013

 English version: Technical Physics Letters, 2013, 39:8, 702–704

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